http://git-wip-us.apache.org/repos/asf/ignite/blob/67b4da70/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsIpcIo.java
----------------------------------------------------------------------
diff --git 
a/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsIpcIo.java
 
b/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsIpcIo.java
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+++ 
b/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsIpcIo.java
@@ -0,0 +1,624 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.ignite.internal.processors.hadoop.igfs;
+
+import java.io.BufferedOutputStream;
+import java.io.EOFException;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Collection;
+import java.util.Iterator;
+import java.util.concurrent.ConcurrentMap;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.atomic.AtomicLong;
+import java.util.concurrent.locks.Lock;
+import java.util.concurrent.locks.ReadWriteLock;
+import java.util.concurrent.locks.ReentrantReadWriteLock;
+import org.apache.commons.logging.Log;
+import org.apache.ignite.IgniteCheckedException;
+import org.apache.ignite.igfs.IgfsException;
+import org.apache.ignite.internal.GridLoggerProxy;
+import org.apache.ignite.internal.IgniteInternalFuture;
+import org.apache.ignite.internal.IgniteInterruptedCheckedException;
+import org.apache.ignite.internal.igfs.common.IgfsControlResponse;
+import org.apache.ignite.internal.igfs.common.IgfsDataInputStream;
+import org.apache.ignite.internal.igfs.common.IgfsDataOutputStream;
+import org.apache.ignite.internal.igfs.common.IgfsIpcCommand;
+import org.apache.ignite.internal.igfs.common.IgfsMarshaller;
+import org.apache.ignite.internal.igfs.common.IgfsMessage;
+import org.apache.ignite.internal.igfs.common.IgfsStreamControlRequest;
+import org.apache.ignite.internal.util.GridConcurrentHashSet;
+import org.apache.ignite.internal.util.GridStripedLock;
+import org.apache.ignite.internal.util.ipc.IpcEndpoint;
+import org.apache.ignite.internal.util.ipc.IpcEndpointFactory;
+import 
org.apache.ignite.internal.util.ipc.shmem.IpcOutOfSystemResourcesException;
+import org.apache.ignite.internal.util.ipc.shmem.IpcSharedMemoryServerEndpoint;
+import org.apache.ignite.internal.util.typedef.internal.U;
+import org.jetbrains.annotations.Nullable;
+import org.jsr166.ConcurrentHashMap8;
+
+/**
+ * IO layer implementation based on blocking IPC streams.
+ */
+@SuppressWarnings("FieldAccessedSynchronizedAndUnsynchronized")
+public class HadoopIgfsIpcIo implements HadoopIgfsIo {
+    /** Logger. */
+    private final Log log;
+
+    /** Request futures map. */
+    private ConcurrentMap<Long, HadoopIgfsFuture> reqMap =
+        new ConcurrentHashMap8<>();
+
+    /** Request ID counter. */
+    private AtomicLong reqIdCnt = new AtomicLong();
+
+    /** Endpoint. */
+    private IpcEndpoint endpoint;
+
+    /** Endpoint output stream. */
+    private IgfsDataOutputStream out;
+
+    /** Protocol. */
+    private final IgfsMarshaller marsh;
+
+    /** Client reader thread. */
+    private Thread reader;
+
+    /** Lock for graceful shutdown. */
+    private final ReadWriteLock busyLock = new ReentrantReadWriteLock();
+
+    /** Stopping flag. */
+    private volatile boolean stopping;
+
+    /** Server endpoint address. */
+    private final String endpointAddr;
+
+    /** Number of open file system sessions. */
+    private final AtomicInteger activeCnt = new AtomicInteger(1);
+
+    /** Event listeners. */
+    private final Collection<HadoopIgfsIpcIoListener> lsnrs =
+        new GridConcurrentHashSet<>();
+
+    /** Cached connections. */
+    private static final ConcurrentMap<String, HadoopIgfsIpcIo> ipcCache =
+        new ConcurrentHashMap8<>();
+
+    /** Striped lock that prevents multiple instance creation in {@link 
#get(Log, String)}. */
+    private static final GridStripedLock initLock = new GridStripedLock(32);
+
+    /**
+     * @param endpointAddr Endpoint.
+     * @param marsh Protocol.
+     * @param log Logger to use.
+     */
+    public HadoopIgfsIpcIo(String endpointAddr, IgfsMarshaller marsh, Log log) 
{
+        assert endpointAddr != null;
+        assert marsh != null;
+
+        this.endpointAddr = endpointAddr;
+        this.marsh = marsh;
+        this.log = log;
+    }
+
+    /**
+     * Returns a started and valid instance of this class
+     * for a given endpoint.
+     *
+     * @param log Logger to use for new instance.
+     * @param endpoint Endpoint string.
+     * @return New or existing cached instance, which is started and 
operational.
+     * @throws IOException If new instance was created but failed to start.
+     */
+    public static HadoopIgfsIpcIo get(Log log, String endpoint) throws 
IOException {
+        while (true) {
+            HadoopIgfsIpcIo clientIo = ipcCache.get(endpoint);
+
+            if (clientIo != null) {
+                if (clientIo.acquire())
+                    return clientIo;
+                else
+                    // If concurrent close.
+                    ipcCache.remove(endpoint, clientIo);
+            }
+            else {
+                Lock lock = initLock.getLock(endpoint);
+
+                lock.lock();
+
+                try {
+                    clientIo = ipcCache.get(endpoint);
+
+                    if (clientIo != null) { // Perform double check.
+                        if (clientIo.acquire())
+                            return clientIo;
+                        else
+                            // If concurrent close.
+                            ipcCache.remove(endpoint, clientIo);
+                    }
+
+                    // Otherwise try creating a new one.
+                    clientIo = new HadoopIgfsIpcIo(endpoint, new 
IgfsMarshaller(), log);
+
+                    try {
+                        clientIo.start();
+                    }
+                    catch (IgniteCheckedException e) {
+                        throw new IOException(e.getMessage(), e);
+                    }
+
+                    HadoopIgfsIpcIo old = ipcCache.putIfAbsent(endpoint, 
clientIo);
+
+                    // Put in exclusive lock.
+                    assert old == null;
+
+                    return clientIo;
+                }
+                finally {
+                    lock.unlock();
+                }
+            }
+        }
+    }
+
+    /**
+     * Increases usage count for this instance.
+     *
+     * @return {@code true} if usage count is greater than zero.
+     */
+    private boolean acquire() {
+        while (true) {
+            int cnt = activeCnt.get();
+
+            if (cnt == 0) {
+                if (log.isDebugEnabled())
+                    log.debug("IPC IO not acquired (count was 0): " + this);
+
+                return false;
+            }
+
+            // Need to make sure that no-one decremented count in between.
+            if (activeCnt.compareAndSet(cnt, cnt + 1)) {
+                if (log.isDebugEnabled())
+                    log.debug("IPC IO acquired: " + this);
+
+                return true;
+            }
+        }
+    }
+
+    /**
+     * Releases this instance, decrementing usage count.
+     * <p>
+     * If usage count becomes zero, the instance is stopped
+     * and removed from cache.
+     */
+    public void release() {
+        while (true) {
+            int cnt = activeCnt.get();
+
+            if (cnt == 0) {
+                if (log.isDebugEnabled())
+                    log.debug("IPC IO not released (count was 0): " + this);
+
+                return;
+            }
+
+            if (activeCnt.compareAndSet(cnt, cnt - 1)) {
+                if (cnt == 1) {
+                    ipcCache.remove(endpointAddr, this);
+
+                    if (log.isDebugEnabled())
+                        log.debug("IPC IO stopping as unused: " + this);
+
+                    stop();
+                }
+                else if (log.isDebugEnabled())
+                    log.debug("IPC IO released: " + this);
+
+                return;
+            }
+        }
+    }
+
+    /**
+     * Closes this IO instance, removing it from cache.
+     */
+    public void forceClose() {
+        if (ipcCache.remove(endpointAddr, this))
+            stop();
+    }
+
+    /**
+     * Starts the IO.
+     *
+     * @throws IgniteCheckedException If failed to connect the endpoint.
+     */
+    private void start() throws IgniteCheckedException {
+        boolean success = false;
+
+        try {
+            endpoint = IpcEndpointFactory.connectEndpoint(
+                endpointAddr, new GridLoggerProxy(new 
HadoopIgfsJclLogger(log), null, null, ""));
+
+            out = new IgfsDataOutputStream(new 
BufferedOutputStream(endpoint.outputStream()));
+
+            reader = new ReaderThread();
+
+            // Required for Hadoop 2.x
+            reader.setDaemon(true);
+
+            reader.start();
+
+            success = true;
+        }
+        catch (IgniteCheckedException e) {
+            IpcOutOfSystemResourcesException resEx = 
e.getCause(IpcOutOfSystemResourcesException.class);
+
+            if (resEx != null)
+                throw new 
IgniteCheckedException(IpcSharedMemoryServerEndpoint.OUT_OF_RESOURCES_MSG, 
resEx);
+
+            throw e;
+        }
+        finally {
+            if (!success)
+                stop();
+        }
+    }
+
+    /**
+     * Shuts down the IO. No send requests will be accepted anymore, all 
pending futures will be failed.
+     * Close listeners will be invoked as if connection is closed by server.
+     */
+    private void stop() {
+        close0(null);
+
+        if (reader != null) {
+            try {
+                U.interrupt(reader);
+                U.join(reader);
+
+                reader = null;
+            }
+            catch (IgniteInterruptedCheckedException ignored) {
+                Thread.currentThread().interrupt();
+
+                log.warn("Got interrupted while waiting for reader thread to 
shut down (will return).");
+            }
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override public void addEventListener(HadoopIgfsIpcIoListener lsnr) {
+        if (!busyLock.readLock().tryLock()) {
+            lsnr.onClose();
+
+            return;
+        }
+
+        boolean invokeNow = false;
+
+        try {
+            invokeNow = stopping;
+
+            if (!invokeNow)
+                lsnrs.add(lsnr);
+        }
+        finally {
+            busyLock.readLock().unlock();
+
+            if (invokeNow)
+                lsnr.onClose();
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override public void removeEventListener(HadoopIgfsIpcIoListener lsnr) {
+        lsnrs.remove(lsnr);
+    }
+
+    /** {@inheritDoc} */
+    @Override public IgniteInternalFuture<IgfsMessage> send(IgfsMessage msg) 
throws IgniteCheckedException {
+        return send(msg, null, 0, 0);
+    }
+
+    /** {@inheritDoc} */
+    @Override public <T> IgniteInternalFuture<T> send(IgfsMessage msg, 
@Nullable byte[] outBuf, int outOff,
+        int outLen) throws IgniteCheckedException {
+        assert outBuf == null || msg.command() == IgfsIpcCommand.READ_BLOCK;
+
+        if (!busyLock.readLock().tryLock())
+            throw new HadoopIgfsCommunicationException("Failed to send message 
(client is being concurrently " +
+                "closed).");
+
+        try {
+            if (stopping)
+                throw new HadoopIgfsCommunicationException("Failed to send 
message (client is being concurrently " +
+                    "closed).");
+
+            long reqId = reqIdCnt.getAndIncrement();
+
+            HadoopIgfsFuture<T> fut = new HadoopIgfsFuture<>();
+
+            fut.outputBuffer(outBuf);
+            fut.outputOffset(outOff);
+            fut.outputLength(outLen);
+            fut.read(msg.command() == IgfsIpcCommand.READ_BLOCK);
+
+            HadoopIgfsFuture oldFut = reqMap.putIfAbsent(reqId, fut);
+
+            assert oldFut == null;
+
+            if (log.isDebugEnabled())
+                log.debug("Sending IGFS message [reqId=" + reqId + ", msg=" + 
msg + ']');
+
+            byte[] hdr = IgfsMarshaller.createHeader(reqId, msg.command());
+
+            IgniteCheckedException err = null;
+
+            try {
+                synchronized (this) {
+                    marsh.marshall(msg, hdr, out);
+
+                    out.flush(); // Blocking operation + sometimes system call.
+                }
+            }
+            catch (IgniteCheckedException e) {
+                err = e;
+            }
+            catch (IOException e) {
+                err = new HadoopIgfsCommunicationException(e);
+            }
+
+            if (err != null) {
+                reqMap.remove(reqId, fut);
+
+                fut.onDone(err);
+            }
+
+            return fut;
+        }
+        finally {
+            busyLock.readLock().unlock();
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override public void sendPlain(IgfsMessage msg) throws 
IgniteCheckedException {
+        if (!busyLock.readLock().tryLock())
+            throw new HadoopIgfsCommunicationException("Failed to send message 
(client is being " +
+                "concurrently closed).");
+
+        try {
+            if (stopping)
+                throw new HadoopIgfsCommunicationException("Failed to send 
message (client is being concurrently closed).");
+
+            assert msg.command() == IgfsIpcCommand.WRITE_BLOCK;
+
+            IgfsStreamControlRequest req = (IgfsStreamControlRequest)msg;
+
+            byte[] hdr = IgfsMarshaller.createHeader(-1, 
IgfsIpcCommand.WRITE_BLOCK);
+
+            U.longToBytes(req.streamId(), hdr, 12);
+            U.intToBytes(req.length(), hdr, 20);
+
+            synchronized (this) {
+                out.write(hdr);
+                out.write(req.data(), (int)req.position(), req.length());
+
+                out.flush();
+            }
+        }
+        catch (IOException e) {
+            throw new HadoopIgfsCommunicationException(e);
+        }
+        finally {
+            busyLock.readLock().unlock();
+        }
+    }
+
+    /**
+     * Closes client but does not wait.
+     *
+     * @param err Error.
+     */
+    private void close0(@Nullable Throwable err) {
+        busyLock.writeLock().lock();
+
+        try {
+            if (stopping)
+                return;
+
+            stopping = true;
+        }
+        finally {
+            busyLock.writeLock().unlock();
+        }
+
+        if (err == null)
+            err = new IgniteCheckedException("Failed to perform request 
(connection was concurrently closed before response " +
+                "is received).");
+
+        // Clean up resources.
+        U.closeQuiet(out);
+
+        if (endpoint != null)
+            endpoint.close();
+
+        // Unwind futures. We can safely iterate here because no more futures 
will be added.
+        Iterator<HadoopIgfsFuture> it = reqMap.values().iterator();
+
+        while (it.hasNext()) {
+            HadoopIgfsFuture fut = it.next();
+
+            fut.onDone(err);
+
+            it.remove();
+        }
+
+        for (HadoopIgfsIpcIoListener lsnr : lsnrs)
+            lsnr.onClose();
+    }
+
+    /**
+     * Do not extend {@code GridThread} to minimize class dependencies.
+     */
+    private class ReaderThread extends Thread {
+        /** {@inheritDoc} */
+        @SuppressWarnings("unchecked")
+        @Override public void run() {
+            // Error to fail pending futures.
+            Throwable err = null;
+
+            try {
+                InputStream in = endpoint.inputStream();
+
+                IgfsDataInputStream dis = new IgfsDataInputStream(in);
+
+                byte[] hdr = new byte[IgfsMarshaller.HEADER_SIZE];
+                byte[] msgHdr = new byte[IgfsControlResponse.RES_HEADER_SIZE];
+
+                while (!Thread.currentThread().isInterrupted()) {
+                    dis.readFully(hdr);
+
+                    long reqId = U.bytesToLong(hdr, 0);
+
+                    // We don't wait for write responses, therefore reqId is 
-1.
+                    if (reqId == -1) {
+                        // We received a response which normally should not be 
sent. It must contain an error.
+                        dis.readFully(msgHdr);
+
+                        assert msgHdr[4] != 0;
+
+                        String errMsg = dis.readUTF();
+
+                        // Error code.
+                        dis.readInt();
+
+                        long streamId = dis.readLong();
+
+                        for (HadoopIgfsIpcIoListener lsnr : lsnrs)
+                            lsnr.onError(streamId, errMsg);
+                    }
+                    else {
+                        HadoopIgfsFuture<Object> fut = reqMap.remove(reqId);
+
+                        if (fut == null) {
+                            String msg = "Failed to read response from server: 
response closure is unavailable for " +
+                                "requestId (will close connection):" + reqId;
+
+                            log.warn(msg);
+
+                            err = new IgniteCheckedException(msg);
+
+                            break;
+                        }
+                        else {
+                            try {
+                                IgfsIpcCommand cmd = 
IgfsIpcCommand.valueOf(U.bytesToInt(hdr, 8));
+
+                                if (log.isDebugEnabled())
+                                    log.debug("Received IGFS response [reqId=" 
+ reqId + ", cmd=" + cmd + ']');
+
+                                Object res = null;
+
+                                if (fut.read()) {
+                                    dis.readFully(msgHdr);
+
+                                    boolean hasErr = msgHdr[4] != 0;
+
+                                    if (hasErr) {
+                                        String errMsg = dis.readUTF();
+
+                                        // Error code.
+                                        Integer errCode = dis.readInt();
+
+                                        
IgfsControlResponse.throwError(errCode, errMsg);
+                                    }
+
+                                    int blockLen = U.bytesToInt(msgHdr, 5);
+
+                                    int readLen = Math.min(blockLen, 
fut.outputLength());
+
+                                    if (readLen > 0) {
+                                        assert fut.outputBuffer() != null;
+
+                                        dis.readFully(fut.outputBuffer(), 
fut.outputOffset(), readLen);
+                                    }
+
+                                    if (readLen != blockLen) {
+                                        byte[] buf = new byte[blockLen - 
readLen];
+
+                                        dis.readFully(buf);
+
+                                        res = buf;
+                                    }
+                                }
+                                else
+                                    res = marsh.unmarshall(cmd, hdr, dis);
+
+                                fut.onDone(res);
+                            }
+                            catch (IgfsException | IgniteCheckedException e) {
+                                if (log.isDebugEnabled())
+                                    log.debug("Failed to apply response 
closure (will fail request future): " +
+                                        e.getMessage());
+
+                                fut.onDone(e);
+
+                                err = e;
+                            }
+                            catch (Throwable t) {
+                                fut.onDone(t);
+
+                                throw t;
+                            }
+                        }
+                    }
+                }
+            }
+            catch (EOFException ignored) {
+                err = new IgniteCheckedException("Failed to read response from 
server (connection was closed by remote peer).");
+            }
+            catch (IOException e) {
+                if (!stopping)
+                    log.error("Failed to read data (connection will be 
closed)", e);
+
+                err = new HadoopIgfsCommunicationException(e);
+            }
+            catch (Throwable e) {
+                if (!stopping)
+                    log.error("Failed to obtain endpoint input stream 
(connection will be closed)", e);
+
+                err = e;
+
+                if (e instanceof Error)
+                    throw (Error)e;
+            }
+            finally {
+                close0(err);
+            }
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override public String toString() {
+        return getClass().getSimpleName() + " [endpointAddr=" + endpointAddr + 
", activeCnt=" + activeCnt +
+            ", stopping=" + stopping + ']';
+    }
+}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/ignite/blob/67b4da70/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsIpcIoListener.java
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diff --git 
a/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsIpcIoListener.java
 
b/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsIpcIoListener.java
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b/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsIpcIoListener.java
@@ -0,0 +1,36 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.ignite.internal.processors.hadoop.igfs;
+
+/**
+ * Listens to the events of {@link HadoopIgfsIpcIo}.
+ */
+public interface HadoopIgfsIpcIoListener {
+    /**
+     * Callback invoked when the IO is being closed.
+     */
+    public void onClose();
+
+    /**
+     * Callback invoked when remote error occurs.
+     *
+     * @param streamId Stream ID.
+     * @param errMsg Error message.
+     */
+    public void onError(long streamId, String errMsg);
+}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/ignite/blob/67b4da70/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsJclLogger.java
----------------------------------------------------------------------
diff --git 
a/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsJclLogger.java
 
b/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsJclLogger.java
new file mode 100644
index 0000000..3a7f45b
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+++ 
b/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsJclLogger.java
@@ -0,0 +1,116 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.ignite.internal.processors.hadoop.igfs;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.apache.ignite.IgniteLogger;
+import org.apache.ignite.internal.util.tostring.GridToStringInclude;
+import org.apache.ignite.internal.util.typedef.internal.S;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * JCL logger wrapper for Hadoop.
+ */
+public class HadoopIgfsJclLogger implements IgniteLogger {
+    /** JCL implementation proxy. */
+    @GridToStringInclude
+    private Log impl;
+
+    /**
+     * Constructor.
+     *
+     * @param impl JCL implementation to use.
+     */
+    HadoopIgfsJclLogger(Log impl) {
+        assert impl != null;
+
+        this.impl = impl;
+    }
+
+    /** {@inheritDoc} */
+    @Override public IgniteLogger getLogger(Object ctgr) {
+        return new HadoopIgfsJclLogger(LogFactory.getLog(
+            ctgr instanceof Class ? ((Class)ctgr).getName() : 
String.valueOf(ctgr)));
+    }
+
+    /** {@inheritDoc} */
+    @Override public void trace(String msg) {
+        impl.trace(msg);
+    }
+
+    /** {@inheritDoc} */
+    @Override public void debug(String msg) {
+        impl.debug(msg);
+    }
+
+    /** {@inheritDoc} */
+    @Override public void info(String msg) {
+        impl.info(msg);
+    }
+
+    /** {@inheritDoc} */
+    @Override public void warning(String msg) {
+        impl.warn(msg);
+    }
+
+    /** {@inheritDoc} */
+    @Override public void warning(String msg, @Nullable Throwable e) {
+        impl.warn(msg, e);
+    }
+
+    /** {@inheritDoc} */
+    @Override public void error(String msg) {
+        impl.error(msg);
+    }
+
+    /** {@inheritDoc} */
+    @Override public boolean isQuiet() {
+        return !isInfoEnabled() && !isDebugEnabled();
+    }
+
+    /** {@inheritDoc} */
+    @Override public void error(String msg, @Nullable Throwable e) {
+        impl.error(msg, e);
+    }
+
+    /** {@inheritDoc} */
+    @Override public boolean isTraceEnabled() {
+        return impl.isTraceEnabled();
+    }
+
+    /** {@inheritDoc} */
+    @Override public boolean isDebugEnabled() {
+        return impl.isDebugEnabled();
+    }
+
+    /** {@inheritDoc} */
+    @Override public boolean isInfoEnabled() {
+        return impl.isInfoEnabled();
+    }
+
+    /** {@inheritDoc} */
+    @Nullable @Override public String fileName() {
+        return null;
+    }
+
+    /** {@inheritDoc} */
+    @Override public String toString() {
+        return S.toString(HadoopIgfsJclLogger.class, this);
+    }
+}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/ignite/blob/67b4da70/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsOutProc.java
----------------------------------------------------------------------
diff --git 
a/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsOutProc.java
 
b/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsOutProc.java
new file mode 100644
index 0000000..9902142
--- /dev/null
+++ 
b/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsOutProc.java
@@ -0,0 +1,524 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.ignite.internal.processors.hadoop.igfs;
+
+import java.io.IOException;
+import java.util.Collection;
+import java.util.Map;
+import org.apache.commons.logging.Log;
+import org.apache.ignite.IgniteCheckedException;
+import org.apache.ignite.igfs.IgfsBlockLocation;
+import org.apache.ignite.igfs.IgfsException;
+import org.apache.ignite.igfs.IgfsFile;
+import org.apache.ignite.igfs.IgfsPath;
+import org.apache.ignite.igfs.IgfsPathSummary;
+import org.apache.ignite.internal.IgniteInternalFuture;
+import org.apache.ignite.internal.igfs.common.IgfsControlResponse;
+import org.apache.ignite.internal.igfs.common.IgfsHandshakeRequest;
+import org.apache.ignite.internal.igfs.common.IgfsMessage;
+import org.apache.ignite.internal.igfs.common.IgfsPathControlRequest;
+import org.apache.ignite.internal.igfs.common.IgfsStatusRequest;
+import org.apache.ignite.internal.igfs.common.IgfsStreamControlRequest;
+import org.apache.ignite.internal.processors.igfs.IgfsHandshakeResponse;
+import org.apache.ignite.internal.processors.igfs.IgfsInputStreamDescriptor;
+import org.apache.ignite.internal.processors.igfs.IgfsStatus;
+import org.apache.ignite.internal.processors.igfs.IgfsUtils;
+import org.apache.ignite.internal.util.future.GridFinishedFuture;
+import org.apache.ignite.internal.util.lang.GridClosureException;
+import org.apache.ignite.lang.IgniteClosure;
+import org.jetbrains.annotations.Nullable;
+import org.jsr166.ConcurrentHashMap8;
+
+import static org.apache.ignite.internal.igfs.common.IgfsIpcCommand.AFFINITY;
+import static org.apache.ignite.internal.igfs.common.IgfsIpcCommand.CLOSE;
+import static org.apache.ignite.internal.igfs.common.IgfsIpcCommand.DELETE;
+import static org.apache.ignite.internal.igfs.common.IgfsIpcCommand.INFO;
+import static org.apache.ignite.internal.igfs.common.IgfsIpcCommand.LIST_FILES;
+import static org.apache.ignite.internal.igfs.common.IgfsIpcCommand.LIST_PATHS;
+import static 
org.apache.ignite.internal.igfs.common.IgfsIpcCommand.MAKE_DIRECTORIES;
+import static 
org.apache.ignite.internal.igfs.common.IgfsIpcCommand.OPEN_APPEND;
+import static 
org.apache.ignite.internal.igfs.common.IgfsIpcCommand.OPEN_CREATE;
+import static org.apache.ignite.internal.igfs.common.IgfsIpcCommand.OPEN_READ;
+import static 
org.apache.ignite.internal.igfs.common.IgfsIpcCommand.PATH_SUMMARY;
+import static org.apache.ignite.internal.igfs.common.IgfsIpcCommand.READ_BLOCK;
+import static org.apache.ignite.internal.igfs.common.IgfsIpcCommand.RENAME;
+import static org.apache.ignite.internal.igfs.common.IgfsIpcCommand.SET_TIMES;
+import static org.apache.ignite.internal.igfs.common.IgfsIpcCommand.UPDATE;
+import static 
org.apache.ignite.internal.igfs.common.IgfsIpcCommand.WRITE_BLOCK;
+
+/**
+ * Communication with external process (TCP or shmem).
+ */
+public class HadoopIgfsOutProc implements HadoopIgfsEx, 
HadoopIgfsIpcIoListener {
+    /** Expected result is boolean. */
+    private static final IgniteClosure<IgniteInternalFuture<IgfsMessage>, 
Boolean> BOOL_RES = createClosure();
+
+    /** Expected result is boolean. */
+    private static final IgniteClosure<IgniteInternalFuture<IgfsMessage>, 
Long> LONG_RES = createClosure();
+
+    /** Expected result is {@code IgfsFile}. */
+    private static final IgniteClosure<IgniteInternalFuture<IgfsMessage>, 
IgfsFile> FILE_RES = createClosure();
+
+    /** Expected result is {@code IgfsHandshakeResponse} */
+    private static final IgniteClosure<IgniteInternalFuture<IgfsMessage>,
+        IgfsHandshakeResponse> HANDSHAKE_RES = createClosure();
+
+    /** Expected result is {@code IgfsStatus} */
+    private static final IgniteClosure<IgniteInternalFuture<IgfsMessage>, 
IgfsStatus> STATUS_RES =
+        createClosure();
+
+    /** Expected result is {@code IgfsFile}. */
+    private static final IgniteClosure<IgniteInternalFuture<IgfsMessage>,
+        IgfsInputStreamDescriptor> STREAM_DESCRIPTOR_RES = createClosure();
+
+    /** Expected result is {@code IgfsFile}. */
+    private static final IgniteClosure<IgniteInternalFuture<IgfsMessage>,
+        Collection<IgfsFile>> FILE_COL_RES = createClosure();
+
+    /** Expected result is {@code IgfsFile}. */
+    private static final IgniteClosure<IgniteInternalFuture<IgfsMessage>,
+        Collection<IgfsPath>> PATH_COL_RES = createClosure();
+
+    /** Expected result is {@code IgfsPathSummary}. */
+    private static final IgniteClosure<IgniteInternalFuture<IgfsMessage>, 
IgfsPathSummary> SUMMARY_RES =
+        createClosure();
+
+    /** Expected result is {@code IgfsFile}. */
+    private static final IgniteClosure<IgniteInternalFuture<IgfsMessage>,
+        Collection<IgfsBlockLocation>> BLOCK_LOCATION_COL_RES = 
createClosure();
+
+    /** Grid name. */
+    private final String grid;
+
+    /** IGFS name. */
+    private final String igfs;
+
+    /** The user this out proc is performing on behalf of. */
+    private final String userName;
+
+    /** Client log. */
+    private final Log log;
+
+    /** Client IO. */
+    private final HadoopIgfsIpcIo io;
+
+    /** Event listeners. */
+    private final Map<Long, HadoopIgfsStreamEventListener> lsnrs = new 
ConcurrentHashMap8<>();
+
+    /**
+     * Constructor for TCP endpoint.
+     *
+     * @param host Host.
+     * @param port Port.
+     * @param grid Grid name.
+     * @param igfs IGFS name.
+     * @param log Client logger.
+     * @throws IOException If failed.
+     */
+    public HadoopIgfsOutProc(String host, int port, String grid, String igfs, 
Log log, String user) throws IOException {
+        this(host, port, grid, igfs, false, log, user);
+    }
+
+    /**
+     * Constructor for shmem endpoint.
+     *
+     * @param port Port.
+     * @param grid Grid name.
+     * @param igfs IGFS name.
+     * @param log Client logger.
+     * @throws IOException If failed.
+     */
+    public HadoopIgfsOutProc(int port, String grid, String igfs, Log log, 
String user) throws IOException {
+        this(null, port, grid, igfs, true, log, user);
+    }
+
+    /**
+     * Constructor.
+     *
+     * @param host Host.
+     * @param port Port.
+     * @param grid Grid name.
+     * @param igfs IGFS name.
+     * @param shmem Shared memory flag.
+     * @param log Client logger.
+     * @throws IOException If failed.
+     */
+    private HadoopIgfsOutProc(String host, int port, String grid, String igfs, 
boolean shmem, Log log, String user)
+        throws IOException {
+        assert host != null && !shmem || host == null && shmem :
+            "Invalid arguments [host=" + host + ", port=" + port + ", shmem=" 
+ shmem + ']';
+
+        String endpoint = host != null ? host + ":" + port : "shmem:" + port;
+
+        this.grid = grid;
+        this.igfs = igfs;
+        this.log = log;
+        this.userName = IgfsUtils.fixUserName(user);
+
+        io = HadoopIgfsIpcIo.get(log, endpoint);
+
+        io.addEventListener(this);
+    }
+
+    /** {@inheritDoc} */
+    @Override public IgfsHandshakeResponse handshake(String logDir) throws 
IgniteCheckedException {
+        final IgfsHandshakeRequest req = new IgfsHandshakeRequest();
+
+        req.gridName(grid);
+        req.igfsName(igfs);
+        req.logDirectory(logDir);
+
+        return io.send(req).chain(HANDSHAKE_RES).get();
+    }
+
+    /** {@inheritDoc} */
+    @Override public void close(boolean force) {
+        assert io != null;
+
+        io.removeEventListener(this);
+
+        if (force)
+            io.forceClose();
+        else
+            io.release();
+    }
+
+    /** {@inheritDoc} */
+    @Override public IgfsFile info(IgfsPath path) throws 
IgniteCheckedException {
+        final IgfsPathControlRequest msg = new IgfsPathControlRequest();
+
+        msg.command(INFO);
+        msg.path(path);
+        msg.userName(userName);
+
+        return io.send(msg).chain(FILE_RES).get();
+    }
+
+    /** {@inheritDoc} */
+    @Override public IgfsFile update(IgfsPath path, Map<String, String> props) 
throws IgniteCheckedException {
+        final IgfsPathControlRequest msg = new IgfsPathControlRequest();
+
+        msg.command(UPDATE);
+        msg.path(path);
+        msg.properties(props);
+        msg.userName(userName);
+
+        return io.send(msg).chain(FILE_RES).get();
+    }
+
+    /** {@inheritDoc} */
+    @Override public Boolean setTimes(IgfsPath path, long accessTime, long 
modificationTime) throws IgniteCheckedException {
+        final IgfsPathControlRequest msg = new IgfsPathControlRequest();
+
+        msg.command(SET_TIMES);
+        msg.path(path);
+        msg.accessTime(accessTime);
+        msg.modificationTime(modificationTime);
+        msg.userName(userName);
+
+        return io.send(msg).chain(BOOL_RES).get();
+    }
+
+    /** {@inheritDoc} */
+    @Override public Boolean rename(IgfsPath src, IgfsPath dest) throws 
IgniteCheckedException {
+        final IgfsPathControlRequest msg = new IgfsPathControlRequest();
+
+        msg.command(RENAME);
+        msg.path(src);
+        msg.destinationPath(dest);
+        msg.userName(userName);
+
+        return io.send(msg).chain(BOOL_RES).get();
+    }
+
+    /** {@inheritDoc} */
+    @Override public Boolean delete(IgfsPath path, boolean recursive) throws 
IgniteCheckedException {
+        final IgfsPathControlRequest msg = new IgfsPathControlRequest();
+
+        msg.command(DELETE);
+        msg.path(path);
+        msg.flag(recursive);
+        msg.userName(userName);
+
+        return io.send(msg).chain(BOOL_RES).get();
+    }
+
+    /** {@inheritDoc} */
+    @Override public Collection<IgfsBlockLocation> affinity(IgfsPath path, 
long start, long len)
+        throws IgniteCheckedException {
+        final IgfsPathControlRequest msg = new IgfsPathControlRequest();
+
+        msg.command(AFFINITY);
+        msg.path(path);
+        msg.start(start);
+        msg.length(len);
+        msg.userName(userName);
+
+        return io.send(msg).chain(BLOCK_LOCATION_COL_RES).get();
+    }
+
+    /** {@inheritDoc} */
+    @Override public IgfsPathSummary contentSummary(IgfsPath path) throws 
IgniteCheckedException {
+        final IgfsPathControlRequest msg = new IgfsPathControlRequest();
+
+        msg.command(PATH_SUMMARY);
+        msg.path(path);
+        msg.userName(userName);
+
+        return io.send(msg).chain(SUMMARY_RES).get();
+    }
+
+    /** {@inheritDoc} */
+    @Override public Boolean mkdirs(IgfsPath path, Map<String, String> props) 
throws IgniteCheckedException {
+        final IgfsPathControlRequest msg = new IgfsPathControlRequest();
+
+        msg.command(MAKE_DIRECTORIES);
+        msg.path(path);
+        msg.properties(props);
+        msg.userName(userName);
+
+        return io.send(msg).chain(BOOL_RES).get();
+    }
+
+    /** {@inheritDoc} */
+    @Override public Collection<IgfsFile> listFiles(IgfsPath path) throws 
IgniteCheckedException {
+        final IgfsPathControlRequest msg = new IgfsPathControlRequest();
+
+        msg.command(LIST_FILES);
+        msg.path(path);
+        msg.userName(userName);
+
+        return io.send(msg).chain(FILE_COL_RES).get();
+    }
+
+    /** {@inheritDoc} */
+    @Override public Collection<IgfsPath> listPaths(IgfsPath path) throws 
IgniteCheckedException {
+        final IgfsPathControlRequest msg = new IgfsPathControlRequest();
+
+        msg.command(LIST_PATHS);
+        msg.path(path);
+        msg.userName(userName);
+
+        return io.send(msg).chain(PATH_COL_RES).get();
+    }
+
+    /** {@inheritDoc} */
+    @Override public IgfsStatus fsStatus() throws IgniteCheckedException {
+        return io.send(new IgfsStatusRequest()).chain(STATUS_RES).get();
+    }
+
+    /** {@inheritDoc} */
+    @Override public HadoopIgfsStreamDelegate open(IgfsPath path) throws 
IgniteCheckedException {
+        final IgfsPathControlRequest msg = new IgfsPathControlRequest();
+
+        msg.command(OPEN_READ);
+        msg.path(path);
+        msg.flag(false);
+        msg.userName(userName);
+
+        IgfsInputStreamDescriptor rmtDesc = 
io.send(msg).chain(STREAM_DESCRIPTOR_RES).get();
+
+        return new HadoopIgfsStreamDelegate(this, rmtDesc.streamId(), 
rmtDesc.length());
+    }
+
+    /** {@inheritDoc} */
+    @Override public HadoopIgfsStreamDelegate open(IgfsPath path,
+        int seqReadsBeforePrefetch) throws IgniteCheckedException {
+        final IgfsPathControlRequest msg = new IgfsPathControlRequest();
+
+        msg.command(OPEN_READ);
+        msg.path(path);
+        msg.flag(true);
+        msg.sequentialReadsBeforePrefetch(seqReadsBeforePrefetch);
+        msg.userName(userName);
+
+        IgfsInputStreamDescriptor rmtDesc = 
io.send(msg).chain(STREAM_DESCRIPTOR_RES).get();
+
+        return new HadoopIgfsStreamDelegate(this, rmtDesc.streamId(), 
rmtDesc.length());
+    }
+
+    /** {@inheritDoc} */
+    @Override public HadoopIgfsStreamDelegate create(IgfsPath path, boolean 
overwrite, boolean colocate,
+        int replication, long blockSize, @Nullable Map<String, String> props) 
throws IgniteCheckedException {
+        final IgfsPathControlRequest msg = new IgfsPathControlRequest();
+
+        msg.command(OPEN_CREATE);
+        msg.path(path);
+        msg.flag(overwrite);
+        msg.colocate(colocate);
+        msg.properties(props);
+        msg.replication(replication);
+        msg.blockSize(blockSize);
+        msg.userName(userName);
+
+        Long streamId = io.send(msg).chain(LONG_RES).get();
+
+        return new HadoopIgfsStreamDelegate(this, streamId);
+    }
+
+    /** {@inheritDoc} */
+    @Override public HadoopIgfsStreamDelegate append(IgfsPath path, boolean 
create,
+        @Nullable Map<String, String> props) throws IgniteCheckedException {
+        final IgfsPathControlRequest msg = new IgfsPathControlRequest();
+
+        msg.command(OPEN_APPEND);
+        msg.path(path);
+        msg.flag(create);
+        msg.properties(props);
+        msg.userName(userName);
+
+        Long streamId = io.send(msg).chain(LONG_RES).get();
+
+        return new HadoopIgfsStreamDelegate(this, streamId);
+    }
+
+    /** {@inheritDoc} */
+    @Override public IgniteInternalFuture<byte[]> 
readData(HadoopIgfsStreamDelegate desc, long pos, int len,
+        final @Nullable byte[] outBuf, final int outOff, final int outLen) {
+        assert len > 0;
+
+        final IgfsStreamControlRequest msg = new IgfsStreamControlRequest();
+
+        msg.command(READ_BLOCK);
+        msg.streamId((long) desc.target());
+        msg.position(pos);
+        msg.length(len);
+
+        try {
+            return io.send(msg, outBuf, outOff, outLen);
+        }
+        catch (IgniteCheckedException e) {
+            return new GridFinishedFuture<>(e);
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override public void writeData(HadoopIgfsStreamDelegate desc, byte[] 
data, int off, int len)
+        throws IOException {
+        final IgfsStreamControlRequest msg = new IgfsStreamControlRequest();
+
+        msg.command(WRITE_BLOCK);
+        msg.streamId((long) desc.target());
+        msg.data(data);
+        msg.position(off);
+        msg.length(len);
+
+        try {
+            io.sendPlain(msg);
+        }
+        catch (IgniteCheckedException e) {
+            throw HadoopIgfsUtils.cast(e);
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override public void flush(HadoopIgfsStreamDelegate delegate) throws 
IOException {
+        // No-op.
+    }
+
+    /** {@inheritDoc} */
+    @Override public void closeStream(HadoopIgfsStreamDelegate desc) throws 
IOException {
+        final IgfsStreamControlRequest msg = new IgfsStreamControlRequest();
+
+        msg.command(CLOSE);
+        msg.streamId((long)desc.target());
+
+        try {
+            io.send(msg).chain(BOOL_RES).get();
+        }
+        catch (IgniteCheckedException e) {
+            throw HadoopIgfsUtils.cast(e);
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override public void addEventListener(HadoopIgfsStreamDelegate desc,
+        HadoopIgfsStreamEventListener lsnr) {
+        long streamId = desc.target();
+
+        HadoopIgfsStreamEventListener lsnr0 = lsnrs.put(streamId, lsnr);
+
+        assert lsnr0 == null || lsnr0 == lsnr;
+
+        if (log.isDebugEnabled())
+            log.debug("Added stream event listener [streamId=" + streamId + 
']');
+    }
+
+    /** {@inheritDoc} */
+    @Override public void removeEventListener(HadoopIgfsStreamDelegate desc) {
+        long streamId = desc.target();
+
+        HadoopIgfsStreamEventListener lsnr0 = lsnrs.remove(streamId);
+
+        if (lsnr0 != null && log.isDebugEnabled())
+            log.debug("Removed stream event listener [streamId=" + streamId + 
']');
+    }
+
+    /** {@inheritDoc} */
+    @Override public void onClose() {
+        for (HadoopIgfsStreamEventListener lsnr : lsnrs.values()) {
+            try {
+                lsnr.onClose();
+            }
+            catch (IgniteCheckedException e) {
+                log.warn("Got exception from stream event listener (will 
ignore): " + lsnr, e);
+            }
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override public void onError(long streamId, String errMsg) {
+        HadoopIgfsStreamEventListener lsnr = lsnrs.get(streamId);
+
+        if (lsnr != null)
+            lsnr.onError(errMsg);
+        else
+            log.warn("Received write error response for not registered output 
stream (will ignore) " +
+                "[streamId= " + streamId + ']');
+    }
+
+    /**
+     * Creates conversion closure for given type.
+     *
+     * @param <T> Type of expected result.
+     * @return Conversion closure.
+     */
+    @SuppressWarnings("unchecked")
+    private static <T> IgniteClosure<IgniteInternalFuture<IgfsMessage>, T> 
createClosure() {
+        return new IgniteClosure<IgniteInternalFuture<IgfsMessage>, T>() {
+            @Override public T apply(IgniteInternalFuture<IgfsMessage> fut) {
+                try {
+                    IgfsControlResponse res = (IgfsControlResponse)fut.get();
+
+                    if (res.hasError())
+                        res.throwError();
+
+                    return (T)res.response();
+                }
+                catch (IgfsException | IgniteCheckedException e) {
+                    throw new GridClosureException(e);
+                }
+            }
+        };
+    }
+
+    /** {@inheritDoc} */
+    @Override public String user() {
+        return userName;
+    }
+}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/ignite/blob/67b4da70/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsOutputStream.java
----------------------------------------------------------------------
diff --git 
a/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsOutputStream.java
 
b/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsOutputStream.java
new file mode 100644
index 0000000..8f7458b
--- /dev/null
+++ 
b/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsOutputStream.java
@@ -0,0 +1,201 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.ignite.internal.processors.hadoop.igfs;
+
+import java.io.IOException;
+import java.io.OutputStream;
+import org.apache.commons.logging.Log;
+import org.apache.ignite.IgniteCheckedException;
+import org.apache.ignite.internal.igfs.common.IgfsLogger;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * IGFS Hadoop output stream implementation.
+ */
+public class HadoopIgfsOutputStream extends OutputStream implements 
HadoopIgfsStreamEventListener {
+    /** Log instance. */
+    private Log log;
+
+    /** Client logger. */
+    private IgfsLogger clientLog;
+
+    /** Log stream ID. */
+    private long logStreamId;
+
+    /** Server stream delegate. */
+    private HadoopIgfsStreamDelegate delegate;
+
+    /** Closed flag. */
+    private volatile boolean closed;
+
+    /** Flag set if stream was closed due to connection breakage. */
+    private boolean connBroken;
+
+    /** Error message. */
+    private volatile String errMsg;
+
+    /** Read time. */
+    private long writeTime;
+
+    /** User time. */
+    private long userTime;
+
+    /** Last timestamp. */
+    private long lastTs;
+
+    /** Amount of written bytes. */
+    private long total;
+
+    /**
+     * Creates light output stream.
+     *
+     * @param delegate Server stream delegate.
+     * @param log Logger to use.
+     * @param clientLog Client logger.
+     */
+    public HadoopIgfsOutputStream(HadoopIgfsStreamDelegate delegate, Log log,
+        IgfsLogger clientLog, long logStreamId) {
+        this.delegate = delegate;
+        this.log = log;
+        this.clientLog = clientLog;
+        this.logStreamId = logStreamId;
+
+        lastTs = System.nanoTime();
+
+        delegate.hadoop().addEventListener(delegate, this);
+    }
+
+    /**
+     * Read start.
+     */
+    private void writeStart() {
+        long now = System.nanoTime();
+
+        userTime += now - lastTs;
+
+        lastTs = now;
+    }
+
+    /**
+     * Read end.
+     */
+    private void writeEnd() {
+        long now = System.nanoTime();
+
+        writeTime += now - lastTs;
+
+        lastTs = now;
+    }
+
+    /** {@inheritDoc} */
+    @Override public void write(@NotNull byte[] b, int off, int len) throws 
IOException {
+        check();
+
+        writeStart();
+
+        try {
+            delegate.hadoop().writeData(delegate, b, off, len);
+
+            total += len;
+        }
+        finally {
+            writeEnd();
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override public void write(int b) throws IOException {
+        write(new byte[] {(byte)b});
+
+        total++;
+    }
+
+    /** {@inheritDoc} */
+    @Override public void flush() throws IOException {
+        delegate.hadoop().flush(delegate);
+    }
+
+    /** {@inheritDoc} */
+    @Override public void close() throws IOException {
+        if (!closed) {
+            if (log.isDebugEnabled())
+                log.debug("Closing output stream: " + delegate);
+
+            writeStart();
+
+            delegate.hadoop().closeStream(delegate);
+
+            markClosed(false);
+
+            writeEnd();
+
+            if (clientLog.isLogEnabled())
+                clientLog.logCloseOut(logStreamId, userTime, writeTime, total);
+
+            if (log.isDebugEnabled())
+                log.debug("Closed output stream [delegate=" + delegate + ", 
writeTime=" + writeTime / 1000 +
+                    ", userTime=" + userTime / 1000 + ']');
+        }
+        else if(connBroken)
+            throw new IOException(
+                "Failed to close stream, because connection was broken (data 
could have been lost).");
+    }
+
+    /**
+     * Marks stream as closed.
+     *
+     * @param connBroken {@code True} if connection with server was lost.
+     */
+    private void markClosed(boolean connBroken) {
+        // It is ok to have race here.
+        if (!closed) {
+            closed = true;
+
+            delegate.hadoop().removeEventListener(delegate);
+
+            this.connBroken = connBroken;
+        }
+    }
+
+    /**
+     * @throws IOException If check failed.
+     */
+    private void check() throws IOException {
+        String errMsg0 = errMsg;
+
+        if (errMsg0 != null)
+            throw new IOException(errMsg0);
+
+        if (closed) {
+            if (connBroken)
+                throw new IOException("Server connection was lost.");
+            else
+                throw new IOException("Stream is closed.");
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override public void onClose() throws IgniteCheckedException {
+        markClosed(true);
+    }
+
+    /** {@inheritDoc} */
+    @Override public void onError(String errMsg) {
+        this.errMsg = errMsg;
+    }
+}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/ignite/blob/67b4da70/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsProperties.java
----------------------------------------------------------------------
diff --git 
a/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsProperties.java
 
b/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsProperties.java
new file mode 100644
index 0000000..90f6bca
--- /dev/null
+++ 
b/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsProperties.java
@@ -0,0 +1,86 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.ignite.internal.processors.hadoop.igfs;
+
+import java.util.Map;
+import org.apache.hadoop.fs.permission.FsPermission;
+import org.apache.ignite.IgniteException;
+import org.apache.ignite.internal.processors.igfs.IgfsUtils;
+
+/**
+ * Hadoop file system properties.
+ */
+public class HadoopIgfsProperties {
+    /** Username. */
+    private String usrName;
+
+    /** Group name. */
+    private String grpName;
+
+    /** Permissions. */
+    private FsPermission perm;
+
+    /**
+     * Constructor.
+     *
+     * @param props Properties.
+     * @throws IgniteException In case of error.
+     */
+    public HadoopIgfsProperties(Map<String, String> props) throws 
IgniteException {
+        usrName = props.get(IgfsUtils.PROP_USER_NAME);
+        grpName = props.get(IgfsUtils.PROP_GROUP_NAME);
+
+        String permStr = props.get(IgfsUtils.PROP_PERMISSION);
+
+        if (permStr != null) {
+            try {
+                perm = new FsPermission((short)Integer.parseInt(permStr, 8));
+            }
+            catch (NumberFormatException ignore) {
+                throw new IgniteException("Permissions cannot be parsed: " + 
permStr);
+            }
+        }
+    }
+
+    /**
+     * Get user name.
+     *
+     * @return User name.
+     */
+    public String userName() {
+        return usrName;
+    }
+
+    /**
+     * Get group name.
+     *
+     * @return Group name.
+     */
+    public String groupName() {
+        return grpName;
+    }
+
+    /**
+     * Get permission.
+     *
+     * @return Permission.
+     */
+    public FsPermission permission() {
+        return perm;
+    }
+}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/ignite/blob/67b4da70/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsProxyInputStream.java
----------------------------------------------------------------------
diff --git 
a/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsProxyInputStream.java
 
b/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsProxyInputStream.java
new file mode 100644
index 0000000..5cee947
--- /dev/null
+++ 
b/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsProxyInputStream.java
@@ -0,0 +1,337 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.ignite.internal.processors.hadoop.igfs;
+
+import java.io.IOException;
+import java.io.InputStream;
+import org.apache.hadoop.fs.FSDataInputStream;
+import org.apache.hadoop.fs.PositionedReadable;
+import org.apache.hadoop.fs.Seekable;
+import org.apache.ignite.internal.igfs.common.IgfsLogger;
+
+/**
+ * Secondary Hadoop file system input stream wrapper.
+ */
+public class HadoopIgfsProxyInputStream extends InputStream implements 
Seekable, PositionedReadable {
+    /** Actual input stream to the secondary file system. */
+    private final FSDataInputStream is;
+
+    /** Client logger. */
+    private final IgfsLogger clientLog;
+
+    /** Log stream ID. */
+    private final long logStreamId;
+
+    /** Read time. */
+    private long readTime;
+
+    /** User time. */
+    private long userTime;
+
+    /** Last timestamp. */
+    private long lastTs;
+
+    /** Amount of read bytes. */
+    private long total;
+
+    /** Closed flag. */
+    private boolean closed;
+
+    /**
+     * Constructor.
+     *
+     * @param is Actual input stream to the secondary file system.
+     * @param clientLog Client log.
+     */
+    public HadoopIgfsProxyInputStream(FSDataInputStream is, IgfsLogger 
clientLog, long logStreamId) {
+        assert is != null;
+        assert clientLog != null;
+
+        this.is = is;
+        this.clientLog = clientLog;
+        this.logStreamId = logStreamId;
+
+        lastTs = System.nanoTime();
+    }
+
+    /** {@inheritDoc} */
+    @Override public synchronized int read(byte[] b) throws IOException {
+        readStart();
+
+        int res;
+
+        try {
+            res = is.read(b);
+        }
+        finally {
+            readEnd();
+        }
+
+        if (res != -1)
+            total += res;
+
+        return res;
+    }
+
+    /** {@inheritDoc} */
+    @Override public synchronized int read(byte[] b, int off, int len) throws 
IOException {
+        readStart();
+
+        int res;
+
+        try {
+            res = super.read(b, off, len);
+        }
+        finally {
+            readEnd();
+        }
+
+        if (res != -1)
+            total += res;
+
+        return res;
+    }
+
+    /** {@inheritDoc} */
+    @Override public synchronized long skip(long n) throws IOException {
+        readStart();
+
+        long res;
+
+        try {
+            res =  is.skip(n);
+        }
+        finally {
+            readEnd();
+        }
+
+        if (clientLog.isLogEnabled())
+            clientLog.logSkip(logStreamId, res);
+
+        return res;
+    }
+
+    /** {@inheritDoc} */
+    @Override public synchronized int available() throws IOException {
+        readStart();
+
+        try {
+            return is.available();
+        }
+        finally {
+            readEnd();
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override public synchronized void close() throws IOException {
+        if (!closed) {
+            closed = true;
+
+            readStart();
+
+            try {
+                is.close();
+            }
+            finally {
+                readEnd();
+            }
+
+            if (clientLog.isLogEnabled())
+                clientLog.logCloseIn(logStreamId, userTime, readTime, total);
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override public synchronized void mark(int readLimit) {
+        readStart();
+
+        try {
+            is.mark(readLimit);
+        }
+        finally {
+            readEnd();
+        }
+
+        if (clientLog.isLogEnabled())
+            clientLog.logMark(logStreamId, readLimit);
+    }
+
+    /** {@inheritDoc} */
+    @Override public synchronized void reset() throws IOException {
+        readStart();
+
+        try {
+            is.reset();
+        }
+        finally {
+            readEnd();
+        }
+
+        if (clientLog.isLogEnabled())
+            clientLog.logReset(logStreamId);
+    }
+
+    /** {@inheritDoc} */
+    @Override public synchronized boolean markSupported() {
+        readStart();
+
+        try {
+            return is.markSupported();
+        }
+        finally {
+            readEnd();
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override public synchronized int read() throws IOException {
+        readStart();
+
+        int res;
+
+        try {
+            res = is.read();
+        }
+        finally {
+            readEnd();
+        }
+
+        if (res != -1)
+            total++;
+
+        return res;
+    }
+
+    /** {@inheritDoc} */
+    @Override public synchronized int read(long pos, byte[] buf, int off, int 
len) throws IOException {
+        readStart();
+
+        int res;
+
+        try {
+            res = is.read(pos, buf, off, len);
+        }
+        finally {
+            readEnd();
+        }
+
+        if (res != -1)
+            total += res;
+
+        if (clientLog.isLogEnabled())
+            clientLog.logRandomRead(logStreamId, pos, res);
+
+        return res;
+    }
+
+    /** {@inheritDoc} */
+    @Override public synchronized void readFully(long pos, byte[] buf, int 
off, int len) throws IOException {
+        readStart();
+
+        try {
+            is.readFully(pos, buf, off, len);
+        }
+        finally {
+            readEnd();
+        }
+
+        total += len;
+
+        if (clientLog.isLogEnabled())
+            clientLog.logRandomRead(logStreamId, pos, len);
+    }
+
+    /** {@inheritDoc} */
+    @Override public synchronized void readFully(long pos, byte[] buf) throws 
IOException {
+        readStart();
+
+        try {
+            is.readFully(pos, buf);
+        }
+        finally {
+            readEnd();
+        }
+
+        total += buf.length;
+
+        if (clientLog.isLogEnabled())
+            clientLog.logRandomRead(logStreamId, pos, buf.length);
+    }
+
+    /** {@inheritDoc} */
+    @Override public synchronized void seek(long pos) throws IOException {
+        readStart();
+
+        try {
+            is.seek(pos);
+        }
+        finally {
+            readEnd();
+        }
+
+        if (clientLog.isLogEnabled())
+            clientLog.logSeek(logStreamId, pos);
+    }
+
+    /** {@inheritDoc} */
+    @Override public synchronized long getPos() throws IOException {
+        readStart();
+
+        try {
+            return is.getPos();
+        }
+        finally {
+            readEnd();
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override public synchronized boolean seekToNewSource(long targetPos) 
throws IOException {
+        readStart();
+
+        try {
+            return is.seekToNewSource(targetPos);
+        }
+        finally {
+            readEnd();
+        }
+    }
+
+    /**
+     * Read start.
+     */
+    private void readStart() {
+        long now = System.nanoTime();
+
+        userTime += now - lastTs;
+
+        lastTs = now;
+    }
+
+    /**
+     * Read end.
+     */
+    private void readEnd() {
+        long now = System.nanoTime();
+
+        readTime += now - lastTs;
+
+        lastTs = now;
+    }
+}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/ignite/blob/67b4da70/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsProxyOutputStream.java
----------------------------------------------------------------------
diff --git 
a/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsProxyOutputStream.java
 
b/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsProxyOutputStream.java
new file mode 100644
index 0000000..eade0f0
--- /dev/null
+++ 
b/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsProxyOutputStream.java
@@ -0,0 +1,165 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.ignite.internal.processors.hadoop.igfs;
+
+import java.io.IOException;
+import java.io.OutputStream;
+import org.apache.hadoop.fs.FSDataOutputStream;
+import org.apache.ignite.internal.igfs.common.IgfsLogger;
+
+/**
+ * Secondary Hadoop file system output stream wrapper.
+ */
+public class HadoopIgfsProxyOutputStream extends OutputStream {
+    /** Actual output stream. */
+    private FSDataOutputStream os;
+
+    /** Client logger. */
+    private final IgfsLogger clientLog;
+
+    /** Log stream ID. */
+    private final long logStreamId;
+
+    /** Read time. */
+    private long writeTime;
+
+    /** User time. */
+    private long userTime;
+
+    /** Last timestamp. */
+    private long lastTs;
+
+    /** Amount of written bytes. */
+    private long total;
+
+    /** Closed flag. */
+    private boolean closed;
+
+    /**
+     * Constructor.
+     *
+     * @param os Actual output stream.
+     * @param clientLog Client logger.
+     * @param logStreamId Log stream ID.
+     */
+    public HadoopIgfsProxyOutputStream(FSDataOutputStream os, IgfsLogger 
clientLog, long logStreamId) {
+        assert os != null;
+        assert clientLog != null;
+
+        this.os = os;
+        this.clientLog = clientLog;
+        this.logStreamId = logStreamId;
+
+        lastTs = System.nanoTime();
+    }
+
+    /** {@inheritDoc} */
+    @Override public synchronized void write(int b) throws IOException {
+        writeStart();
+
+        try {
+            os.write(b);
+        }
+        finally {
+            writeEnd();
+        }
+
+        total++;
+    }
+
+    /** {@inheritDoc} */
+    @Override public synchronized void write(byte[] b) throws IOException {
+        writeStart();
+
+        try {
+            os.write(b);
+        }
+        finally {
+            writeEnd();
+        }
+
+        total += b.length;
+    }
+
+    /** {@inheritDoc} */
+    @Override public synchronized void write(byte[] b, int off, int len) 
throws IOException {
+        writeStart();
+
+        try {
+            os.write(b, off, len);
+        }
+        finally {
+            writeEnd();
+        }
+
+        total += len;
+    }
+
+    /** {@inheritDoc} */
+    @Override public synchronized void flush() throws IOException {
+        writeStart();
+
+        try {
+            os.flush();
+        }
+        finally {
+            writeEnd();
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override public synchronized void close() throws IOException {
+        if (!closed) {
+            closed = true;
+
+            writeStart();
+
+            try {
+                os.close();
+            }
+            finally {
+                writeEnd();
+            }
+
+            if (clientLog.isLogEnabled())
+                clientLog.logCloseOut(logStreamId, userTime, writeTime, total);
+        }
+    }
+
+    /**
+     * Read start.
+     */
+    private void writeStart() {
+        long now = System.nanoTime();
+
+        userTime += now - lastTs;
+
+        lastTs = now;
+    }
+
+    /**
+     * Read end.
+     */
+    private void writeEnd() {
+        long now = System.nanoTime();
+
+        writeTime += now - lastTs;
+
+        lastTs = now;
+    }
+}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/ignite/blob/67b4da70/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsSecondaryFileSystemPositionedReadable.java
----------------------------------------------------------------------
diff --git 
a/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsSecondaryFileSystemPositionedReadable.java
 
b/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsSecondaryFileSystemPositionedReadable.java
new file mode 100644
index 0000000..a0577ce
--- /dev/null
+++ 
b/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsSecondaryFileSystemPositionedReadable.java
@@ -0,0 +1,105 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.ignite.internal.processors.hadoop.igfs;
+
+import java.io.IOException;
+import org.apache.hadoop.fs.FSDataInputStream;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.fs.PositionedReadable;
+import 
org.apache.ignite.igfs.secondary.IgfsSecondaryFileSystemPositionedReadable;
+import org.apache.ignite.internal.util.typedef.internal.U;
+
+/**
+ * Secondary file system input stream wrapper which actually opens input 
stream only in case it is explicitly
+ * requested.
+ * <p>
+ * The class is expected to be used only from synchronized context and 
therefore is not tread-safe.
+ */
+public class HadoopIgfsSecondaryFileSystemPositionedReadable implements 
IgfsSecondaryFileSystemPositionedReadable {
+    /** Secondary file system. */
+    private final FileSystem fs;
+
+    /** Path to the file to open. */
+    private final Path path;
+
+    /** Buffer size. */
+    private final int bufSize;
+
+    /** Actual input stream. */
+    private FSDataInputStream in;
+
+    /** Cached error occurred during output stream open. */
+    private IOException err;
+
+    /** Flag indicating that the stream was already opened. */
+    private boolean opened;
+
+    /**
+     * Constructor.
+     *
+     * @param fs Secondary file system.
+     * @param path Path to the file to open.
+     * @param bufSize Buffer size.
+     */
+    public HadoopIgfsSecondaryFileSystemPositionedReadable(FileSystem fs, Path 
path, int bufSize) {
+        assert fs != null;
+        assert path != null;
+
+        this.fs = fs;
+        this.path = path;
+        this.bufSize = bufSize;
+    }
+
+    /** Get input stream. */
+    private PositionedReadable in() throws IOException {
+        if (opened) {
+            if (err != null)
+                throw err;
+        }
+        else {
+            opened = true;
+
+            try {
+                in = fs.open(path, bufSize);
+
+                if (in == null)
+                    throw new IOException("Failed to open input stream (file 
system returned null): " + path);
+            }
+            catch (IOException e) {
+                err = e;
+
+                throw err;
+            }
+        }
+
+        return in;
+    }
+
+    /**
+     * Close wrapped input stream in case it was previously opened.
+     */
+    @Override public void close() {
+        U.closeQuiet(in);
+    }
+
+    /** {@inheritDoc} */
+    @Override public int read(long pos, byte[] buf, int off, int len) throws 
IOException {
+        return in().read(pos, buf, off, len);
+    }
+}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/ignite/blob/67b4da70/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsStreamDelegate.java
----------------------------------------------------------------------
diff --git 
a/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsStreamDelegate.java
 
b/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsStreamDelegate.java
new file mode 100644
index 0000000..37b58ab
--- /dev/null
+++ 
b/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsStreamDelegate.java
@@ -0,0 +1,96 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.ignite.internal.processors.hadoop.igfs;
+
+import org.apache.ignite.internal.util.typedef.internal.S;
+
+/**
+ * IGFS Hadoop stream descriptor.
+ */
+public class HadoopIgfsStreamDelegate {
+    /** RPC handler. */
+    private final HadoopIgfsEx hadoop;
+
+    /** Target. */
+    private final Object target;
+
+    /** Optional stream length. */
+    private final long len;
+
+    /**
+     * Constructor.
+     *
+     * @param target Target.
+     */
+    public HadoopIgfsStreamDelegate(HadoopIgfsEx hadoop, Object target) {
+        this(hadoop, target, -1);
+    }
+
+    /**
+     * Constructor.
+     *
+     * @param target Target.
+     * @param len Optional length.
+     */
+    public HadoopIgfsStreamDelegate(HadoopIgfsEx hadoop, Object target, long 
len) {
+        assert hadoop != null;
+        assert target != null;
+
+        this.hadoop = hadoop;
+        this.target = target;
+        this.len = len;
+    }
+
+    /**
+     * @return RPC handler.
+     */
+    public HadoopIgfsEx hadoop() {
+        return hadoop;
+    }
+
+    /**
+     * @return Stream target.
+     */
+    @SuppressWarnings("unchecked")
+    public <T> T target() {
+        return (T) target;
+    }
+
+    /**
+     * @return Length.
+     */
+    public long length() {
+        return len;
+    }
+
+    /** {@inheritDoc} */
+    @Override public int hashCode() {
+        return System.identityHashCode(target);
+    }
+
+    /** {@inheritDoc} */
+    @Override public boolean equals(Object obj) {
+        return obj != null && obj instanceof HadoopIgfsStreamDelegate &&
+            target == ((HadoopIgfsStreamDelegate)obj).target;
+    }
+
+    /** {@inheritDoc} */
+    @Override public String toString() {
+        return S.toString(HadoopIgfsStreamDelegate.class, this);
+    }
+}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/ignite/blob/67b4da70/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsStreamEventListener.java
----------------------------------------------------------------------
diff --git 
a/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsStreamEventListener.java
 
b/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsStreamEventListener.java
new file mode 100644
index 0000000..d81f765
--- /dev/null
+++ 
b/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsStreamEventListener.java
@@ -0,0 +1,39 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.ignite.internal.processors.hadoop.igfs;
+
+import org.apache.ignite.IgniteCheckedException;
+
+/**
+ * IGFS input stream event listener.
+ */
+public interface HadoopIgfsStreamEventListener {
+    /**
+     * Callback invoked when the stream is being closed.
+     *
+     * @throws IgniteCheckedException If failed.
+     */
+    public void onClose() throws IgniteCheckedException;
+
+    /**
+     * Callback invoked when remote error occurs.
+     *
+     * @param errMsg Error message.
+     */
+    public void onError(String errMsg);
+}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/ignite/blob/67b4da70/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsUtils.java
----------------------------------------------------------------------
diff --git 
a/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsUtils.java
 
b/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsUtils.java
new file mode 100644
index 0000000..fa5cbc5
--- /dev/null
+++ 
b/modules/hadoop-impl/src/main/java/org/apache/ignite/internal/processors/hadoop/impl/igfs/HadoopIgfsUtils.java
@@ -0,0 +1,174 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.ignite.internal.processors.hadoop.igfs;
+
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.AbstractFileSystem;
+import org.apache.hadoop.fs.FileStatus;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.ParentNotDirectoryException;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.fs.PathExistsException;
+import org.apache.hadoop.fs.PathIsNotEmptyDirectoryException;
+import org.apache.ignite.IgniteCheckedException;
+import org.apache.ignite.igfs.IgfsDirectoryNotEmptyException;
+import org.apache.ignite.igfs.IgfsParentNotDirectoryException;
+import org.apache.ignite.igfs.IgfsPathAlreadyExistsException;
+import org.apache.ignite.igfs.IgfsPathNotFoundException;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Utility constants and methods for IGFS Hadoop file system.
+ */
+public class HadoopIgfsUtils {
+    /** Parameter name for endpoint no embed mode flag. */
+    public static final String PARAM_IGFS_ENDPOINT_NO_EMBED = 
"fs.igfs.%s.endpoint.no_embed";
+
+    /** Parameter name for endpoint no shared memory flag. */
+    public static final String PARAM_IGFS_ENDPOINT_NO_LOCAL_SHMEM = 
"fs.igfs.%s.endpoint.no_local_shmem";
+
+    /** Parameter name for endpoint no local TCP flag. */
+    public static final String PARAM_IGFS_ENDPOINT_NO_LOCAL_TCP = 
"fs.igfs.%s.endpoint.no_local_tcp";
+
+    /**
+     * Get string parameter.
+     *
+     * @param cfg Configuration.
+     * @param name Parameter name.
+     * @param authority Authority.
+     * @param dflt Default value.
+     * @return String value.
+     */
+    public static String parameter(Configuration cfg, String name, String 
authority, String dflt) {
+        return cfg.get(String.format(name, authority != null ? authority : 
""), dflt);
+    }
+
+    /**
+     * Get integer parameter.
+     *
+     * @param cfg Configuration.
+     * @param name Parameter name.
+     * @param authority Authority.
+     * @param dflt Default value.
+     * @return Integer value.
+     * @throws IOException In case of parse exception.
+     */
+    public static int parameter(Configuration cfg, String name, String 
authority, int dflt) throws IOException {
+        String name0 = String.format(name, authority != null ? authority : "");
+
+        try {
+            return cfg.getInt(name0, dflt);
+        }
+        catch (NumberFormatException ignore) {
+            throw new IOException("Failed to parse parameter value to integer: 
" + name0);
+        }
+    }
+
+    /**
+     * Get boolean parameter.
+     *
+     * @param cfg Configuration.
+     * @param name Parameter name.
+     * @param authority Authority.
+     * @param dflt Default value.
+     * @return Boolean value.
+     */
+    public static boolean parameter(Configuration cfg, String name, String 
authority, boolean dflt) {
+        return cfg.getBoolean(String.format(name, authority != null ? 
authority : ""), dflt);
+    }
+
+    /**
+     * Cast Ignite exception to appropriate IO exception.
+     *
+     * @param e Exception to cast.
+     * @return Casted exception.
+     */
+    public static IOException cast(IgniteCheckedException e) {
+        return cast(e, null);
+    }
+
+    /**
+     * Cast Ignite exception to appropriate IO exception.
+     *
+     * @param e Exception to cast.
+     * @param path Path for exceptions.
+     * @return Casted exception.
+     */
+    @SuppressWarnings("unchecked")
+    public static IOException cast(IgniteCheckedException e, @Nullable String 
path) {
+        assert e != null;
+
+        // First check for any nested IOException; if exists - re-throw it.
+        if (e.hasCause(IOException.class))
+            return e.getCause(IOException.class);
+        else if (e.hasCause(IgfsPathNotFoundException.class))
+            return new FileNotFoundException(path); // TODO: Or 
PathNotFoundException?
+        else if (e.hasCause(IgfsParentNotDirectoryException.class))
+            return new ParentNotDirectoryException(path);
+        else if (path != null && 
e.hasCause(IgfsDirectoryNotEmptyException.class))
+            return new PathIsNotEmptyDirectoryException(path);
+        else if (path != null && 
e.hasCause(IgfsPathAlreadyExistsException.class))
+            return new PathExistsException(path);
+        else {
+            String msg = e.getMessage();
+
+            return msg == null ? new IOException(e) : new IOException(msg, e);
+        }
+    }
+
+    /**
+     * Deletes all files from the given file system.
+     *
+     * @param fs The file system to clean up.
+     * @throws IOException On error.
+     */
+    public static void clear(FileSystem fs) throws IOException {
+        // Delete root contents:
+        FileStatus[] statuses = fs.listStatus(new Path("/"));
+
+        if (statuses != null) {
+            for (FileStatus stat: statuses)
+                fs.delete(stat.getPath(), true);
+        }
+    }
+
+    /**
+     * Deletes all files from the given file system.
+     *
+     * @param fs The file system to clean up.
+     * @throws IOException On error.
+     */
+    public static void clear(AbstractFileSystem fs) throws IOException {
+        // Delete root contents:
+        FileStatus[] statuses = fs.listStatus(new Path("/"));
+
+        if (statuses != null) {
+            for (FileStatus stat: statuses)
+                fs.delete(stat.getPath(), true);
+        }
+    }
+
+    /**
+     * Constructor.
+     */
+    private HadoopIgfsUtils() {
+        // No-op.
+    }
+}
\ No newline at end of file

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