Repository: hadoop
Updated Branches:
  refs/heads/branch-2 00dec84cc -> 954dae26c


http://git-wip-us.apache.org/repos/asf/hadoop/blob/954dae26/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/ReplicaOutputStreams.java
----------------------------------------------------------------------
diff --git 
a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/ReplicaOutputStreams.java
 
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/ReplicaOutputStreams.java
index a66847a..42f0c58 100644
--- 
a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/ReplicaOutputStreams.java
+++ 
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/ReplicaOutputStreams.java
@@ -20,15 +20,15 @@ package org.apache.hadoop.hdfs.server.datanode.fsdataset;
 import java.io.Closeable;
 import java.io.FileDescriptor;
 import java.io.FileOutputStream;
+import java.io.Flushable;
 import java.io.OutputStream;
 import java.io.IOException;
 
 import org.apache.hadoop.hdfs.server.datanode.DataNode;
+import org.apache.hadoop.hdfs.server.datanode.FileIoProvider;
 import org.apache.hadoop.io.IOUtils;
-import org.apache.hadoop.io.nativeio.NativeIO;
 import org.apache.hadoop.io.nativeio.NativeIOException;
 import org.apache.hadoop.util.DataChecksum;
-import org.apache.hadoop.util.Time;
 import org.slf4j.Logger;
 
 /**
@@ -43,21 +43,22 @@ public class ReplicaOutputStreams implements Closeable {
   /** Stream to checksum. */
   private final OutputStream checksumOut;
   private final DataChecksum checksum;
-  private final boolean isTransientStorage;
-  private final long slowLogThresholdMs;
+  private final FsVolumeSpi volume;
+  private final FileIoProvider fileIoProvider;
 
   /**
    * Create an object with a data output stream, a checksum output stream
    * and a checksum.
    */
-  public ReplicaOutputStreams(OutputStream dataOut,
-      OutputStream checksumOut, DataChecksum checksum,
-      boolean isTransientStorage, long slowLogThresholdMs) {
+  public ReplicaOutputStreams(
+      OutputStream dataOut, OutputStream checksumOut, DataChecksum checksum,
+      FsVolumeSpi volume, FileIoProvider fileIoProvider) {
+
     this.dataOut = dataOut;
     this.checksum = checksum;
-    this.slowLogThresholdMs = slowLogThresholdMs;
-    this.isTransientStorage = isTransientStorage;
     this.checksumOut = checksumOut;
+    this.volume = volume;
+    this.fileIoProvider = fileIoProvider;
 
     try {
       if (this.dataOut instanceof FileOutputStream) {
@@ -93,7 +94,7 @@ public class ReplicaOutputStreams implements Closeable {
 
   /** @return is writing to a transient storage? */
   public boolean isTransientStorage() {
-    return isTransientStorage;
+    return volume.isTransientStorage();
   }
 
   @Override
@@ -112,7 +113,7 @@ public class ReplicaOutputStreams implements Closeable {
    */
   public void syncDataOut() throws IOException {
     if (dataOut instanceof FileOutputStream) {
-      sync((FileOutputStream)dataOut);
+      fileIoProvider.sync(volume, (FileOutputStream) dataOut);
     }
   }
   
@@ -121,7 +122,7 @@ public class ReplicaOutputStreams implements Closeable {
    */
   public void syncChecksumOut() throws IOException {
     if (checksumOut instanceof FileOutputStream) {
-      sync((FileOutputStream)checksumOut);
+      fileIoProvider.sync(volume, (FileOutputStream) checksumOut);
     }
   }
 
@@ -129,60 +130,34 @@ public class ReplicaOutputStreams implements Closeable {
    * Flush the data stream if it supports it.
    */
   public void flushDataOut() throws IOException {
-    flush(dataOut);
+    if (dataOut != null) {
+      fileIoProvider.flush(volume, dataOut);
+    }
   }
 
   /**
    * Flush the checksum stream if it supports it.
    */
   public void flushChecksumOut() throws IOException {
-    flush(checksumOut);
-  }
-
-  private void flush(OutputStream dos) throws IOException {
-    long begin = Time.monotonicNow();
-    dos.flush();
-    long duration = Time.monotonicNow() - begin;
-    LOG.trace("ReplicaOutputStreams#flush takes {} ms.", duration);
-    if (duration > slowLogThresholdMs) {
-      LOG.warn("Slow flush took {} ms (threshold={} ms)", duration,
-          slowLogThresholdMs);
+    if (checksumOut != null) {
+      fileIoProvider.flush(volume, checksumOut);
     }
   }
 
-  private void sync(FileOutputStream fos) throws IOException {
-    long begin = Time.monotonicNow();
-    fos.getChannel().force(true);
-    long duration = Time.monotonicNow() - begin;
-    LOG.trace("ReplicaOutputStreams#sync takes {} ms.", duration);
-    if (duration > slowLogThresholdMs) {
-      LOG.warn("Slow fsync took {} ms (threshold={} ms)", duration,
-          slowLogThresholdMs);
-    }
-  }
-
-  public long writeToDisk(byte[] b, int off, int len) throws IOException {
-    long begin = Time.monotonicNow();
+  public void writeDataToDisk(byte[] b, int off, int len)
+      throws IOException {
     dataOut.write(b, off, len);
-    long duration = Time.monotonicNow() - begin;
-    LOG.trace("DatanodeIO#writeToDisk takes {} ms.", duration);
-    if (duration > slowLogThresholdMs) {
-      LOG.warn("Slow BlockReceiver write data to disk cost: {} ms " +
-          "(threshold={} ms)", duration, slowLogThresholdMs);
-    }
-    return duration;
   }
 
   public void syncFileRangeIfPossible(long offset, long nbytes,
       int flags) throws NativeIOException {
-    assert this.outFd != null : "null outFd!";
-    NativeIO.POSIX.syncFileRangeIfPossible(outFd, offset, nbytes, flags);
+    fileIoProvider.syncFileRange(
+        volume, outFd, offset, nbytes, flags);
   }
 
   public void dropCacheBehindWrites(String identifier,
       long offset, long len, int flags) throws NativeIOException {
-    assert this.outFd != null : "null outFd!";
-    NativeIO.POSIX.getCacheManipulator().posixFadviseIfPossible(
-        identifier, outFd, offset, len, flags);
+    fileIoProvider.posixFadvise(
+        volume, identifier, outFd, offset, len, flags);
   }
 }

http://git-wip-us.apache.org/repos/asf/hadoop/blob/954dae26/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/BlockPoolSlice.java
----------------------------------------------------------------------
diff --git 
a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/BlockPoolSlice.java
 
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/BlockPoolSlice.java
index 5b701b5..cd44557 100644
--- 
a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/BlockPoolSlice.java
+++ 
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/BlockPoolSlice.java
@@ -32,19 +32,18 @@ import java.util.Iterator;
 import java.util.Scanner;
 import java.util.concurrent.atomic.AtomicLong;
 
-import org.apache.commons.io.FileUtils;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.CachingGetSpaceUsed;
 import org.apache.hadoop.fs.CommonConfigurationKeys;
-import org.apache.hadoop.fs.FileUtil;
 import org.apache.hadoop.fs.GetSpaceUsed;
 import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.hdfs.DFSUtilClient;
 import org.apache.hadoop.hdfs.protocol.Block;
 import org.apache.hadoop.hdfs.protocol.BlockListAsLongs;
 import org.apache.hadoop.hdfs.protocol.BlockListAsLongs.BlockReportReplica;
+import org.apache.hadoop.hdfs.server.datanode.FileIoProvider;
 import org.apache.hadoop.hdfs.server.datanode.BlockMetadataHeader;
 import org.apache.hadoop.hdfs.server.datanode.DataStorage;
 import org.apache.hadoop.hdfs.server.datanode.DatanodeUtil;
@@ -63,7 +62,6 @@ import org.apache.hadoop.util.ShutdownHookManager;
 import org.apache.hadoop.util.Timer;
 
 import com.google.common.annotations.VisibleForTesting;
-import com.google.common.io.Files;
 
 /**
  * A block pool slice represents a portion of a block pool stored on a volume.
@@ -95,6 +93,7 @@ class BlockPoolSlice {
   private final long cachedDfsUsedCheckTime;
   private final Timer timer;
   private final int maxDataLength;
+  private final FileIoProvider fileIoProvider;
 
   // TODO:FEDERATION scalability issue - a thread per DU is needed
   private final GetSpaceUsed dfsUsage;
@@ -112,6 +111,7 @@ class BlockPoolSlice {
       Configuration conf, Timer timer) throws IOException {
     this.bpid = bpid;
     this.volume = volume;
+    this.fileIoProvider = volume.getFileIoProvider();
     this.currentDir = new File(bpDir, DataStorage.STORAGE_DIR_CURRENT);
     this.finalizedDir = new File(
         currentDir, DataStorage.STORAGE_DIR_FINALIZED);
@@ -146,25 +146,20 @@ class BlockPoolSlice {
     //
     this.tmpDir = new File(bpDir, DataStorage.STORAGE_DIR_TMP);
     if (tmpDir.exists()) {
-      DataStorage.fullyDelete(tmpDir);
+      fileIoProvider.fullyDelete(volume, tmpDir);
     }
     this.rbwDir = new File(currentDir, DataStorage.STORAGE_DIR_RBW);
     final boolean supportAppends = conf.getBoolean(
         DFSConfigKeys.DFS_SUPPORT_APPEND_KEY,
         DFSConfigKeys.DFS_SUPPORT_APPEND_DEFAULT);
     if (rbwDir.exists() && !supportAppends) {
-      FileUtil.fullyDelete(rbwDir);
-    }
-    if (!rbwDir.mkdirs()) {  // create rbw directory if not exist
-      if (!rbwDir.isDirectory()) {
-        throw new IOException("Mkdirs failed to create " + rbwDir.toString());
-      }
-    }
-    if (!tmpDir.mkdirs()) {
-      if (!tmpDir.isDirectory()) {
-        throw new IOException("Mkdirs failed to create " + tmpDir.toString());
-      }
+      fileIoProvider.fullyDelete(volume, rbwDir);
     }
+
+    // create the rbw and tmp directories if they don't exist.
+    fileIoProvider.mkdirs(volume, rbwDir);
+    fileIoProvider.mkdirs(volume, tmpDir);
+
     // Use cached value initially if available. Or the following call will
     // block until the initial du command completes.
     this.dfsUsage = new CachingGetSpaceUsed.Builder().setPath(bpDir)
@@ -271,7 +266,7 @@ class BlockPoolSlice {
    */
   void saveDfsUsed() {
     File outFile = new File(currentDir, DU_CACHE_FILE);
-    if (outFile.exists() && !outFile.delete()) {
+    if (!fileIoProvider.deleteWithExistsCheck(volume, outFile)) {
       FsDatasetImpl.LOG.warn("Failed to delete old dfsUsed file in " +
         outFile.getParent());
     }
@@ -279,10 +274,10 @@ class BlockPoolSlice {
     try {
       long used = getDfsUsed();
       try (Writer out = new OutputStreamWriter(
-          new FileOutputStream(outFile), "UTF-8")) {
+          fileIoProvider.getFileOutputStream(volume, outFile), "UTF-8")) {
         // mtime is written last, so that truncated writes won't be valid.
         out.write(Long.toString(used) + " " + Long.toString(timer.now()));
-        out.flush();
+        fileIoProvider.flush(volume, out);
       }
     } catch (IOException ioe) {
       // If write failed, the volume might be bad. Since the cache file is
@@ -297,7 +292,8 @@ class BlockPoolSlice {
    */
   File createTmpFile(Block b) throws IOException {
     File f = new File(tmpDir, b.getBlockName());
-    File tmpFile = DatanodeUtil.createTmpFile(b, f);
+    File tmpFile = DatanodeUtil.createFileWithExistsCheck(
+        volume, b, f, fileIoProvider);
     // If any exception during creation, its expected that counter will not be
     // incremented, So no need to decrement
     incrNumBlocks();
@@ -310,7 +306,8 @@ class BlockPoolSlice {
    */
   File createRbwFile(Block b) throws IOException {
     File f = new File(rbwDir, b.getBlockName());
-    File rbwFile = DatanodeUtil.createTmpFile(b, f);
+    File rbwFile = DatanodeUtil.createFileWithExistsCheck(
+        volume, b, f, fileIoProvider);
     // If any exception during creation, its expected that counter will not be
     // incremented, So no need to decrement
     incrNumBlocks();
@@ -319,12 +316,9 @@ class BlockPoolSlice {
 
   File addBlock(Block b, File f) throws IOException {
     File blockDir = DatanodeUtil.idToBlockDir(finalizedDir, b.getBlockId());
-    if (!blockDir.exists()) {
-      if (!blockDir.mkdirs()) {
-        throw new IOException("Failed to mkdirs " + blockDir);
-      }
-    }
-    File blockFile = FsDatasetImpl.moveBlockFiles(b, f, blockDir);
+    fileIoProvider.mkdirsWithExistsCheck(volume, blockDir);
+    File blockFile = ((FsDatasetImpl) volume.getDataset()).moveBlockFiles(
+        volume, b, f, blockDir);
     File metaFile = FsDatasetUtil.getMetaFile(blockFile, 
b.getGenerationStamp());
     if (dfsUsage instanceof CachingGetSpaceUsed) {
       ((CachingGetSpaceUsed) dfsUsage).incDfsUsed(
@@ -342,9 +336,9 @@ class BlockPoolSlice {
     final File blockDir = DatanodeUtil.idToBlockDir(finalizedDir, 
b.getBlockId());
     final File targetBlockFile = new File(blockDir, blockFile.getName());
     final File targetMetaFile = new File(blockDir, metaFile.getName());
-    FileUtils.moveFile(blockFile, targetBlockFile);
+    fileIoProvider.moveFile(volume, blockFile, targetBlockFile);
     FsDatasetImpl.LOG.info("Moved " + blockFile + " to " + targetBlockFile);
-    FileUtils.moveFile(metaFile, targetMetaFile);
+    fileIoProvider.moveFile(volume, metaFile, targetMetaFile);
     FsDatasetImpl.LOG.info("Moved " + metaFile + " to " + targetMetaFile);
     return targetBlockFile;
   }
@@ -387,16 +381,13 @@ class BlockPoolSlice {
     File blockFile = FsDatasetUtil.getOrigFile(unlinkedTmp);
     if (blockFile.exists()) {
       // If the original block file still exists, then no recovery is needed.
-      if (!unlinkedTmp.delete()) {
+      if (!fileIoProvider.delete(volume, unlinkedTmp)) {
         throw new IOException("Unable to cleanup unlinked tmp file " +
             unlinkedTmp);
       }
       return null;
     } else {
-      if (!unlinkedTmp.renameTo(blockFile)) {
-        throw new IOException("Unable to rename unlinked tmp file " +
-            unlinkedTmp);
-      }
+      fileIoProvider.rename(volume, unlinkedTmp, blockFile);
       return blockFile;
     }
   }
@@ -409,7 +400,7 @@ class BlockPoolSlice {
    */
   private int moveLazyPersistReplicasToFinalized(File source)
       throws IOException {
-    File files[] = FileUtil.listFiles(source);
+    File[] files = fileIoProvider.listFiles(volume, source);
     int numRecovered = 0;
     for (File file : files) {
       if (file.isDirectory()) {
@@ -424,24 +415,25 @@ class BlockPoolSlice {
 
         if (blockFile.exists()) {
 
-          if (!targetDir.exists() && !targetDir.mkdirs()) {
+          try {
+            fileIoProvider.mkdirsWithExistsCheck(volume, targetDir);
+          } catch(IOException ioe) {
             LOG.warn("Failed to mkdirs " + targetDir);
             continue;
           }
 
           final File targetMetaFile = new File(targetDir, metaFile.getName());
           try {
-            ReplicaInfo.rename(metaFile, targetMetaFile);
+            fileIoProvider.rename(volume, metaFile, targetMetaFile);
           } catch (IOException e) {
             LOG.warn("Failed to move meta file from "
                 + metaFile + " to " + targetMetaFile, e);
             continue;
-
           }
 
           final File targetBlockFile = new File(targetDir, 
blockFile.getName());
           try {
-            ReplicaInfo.rename(blockFile, targetBlockFile);
+            fileIoProvider.rename(volume, blockFile, targetBlockFile);
           } catch (IOException e) {
             LOG.warn("Failed to move block file from "
                 + blockFile + " to " + targetBlockFile, e);
@@ -458,7 +450,7 @@ class BlockPoolSlice {
       }
     }
 
-    FileUtil.fullyDelete(source);
+    fileIoProvider.fullyDelete(volume, source);
     return numRecovered;
   }
 
@@ -491,7 +483,7 @@ class BlockPoolSlice {
           loadRwr = false;
         }
         sc.close();
-        if (!restartMeta.delete()) {
+        if (!fileIoProvider.delete(volume, restartMeta)) {
           FsDatasetImpl.LOG.warn("Failed to delete restart meta file: " +
               restartMeta.getPath());
         }
@@ -547,7 +539,7 @@ class BlockPoolSlice {
                         final RamDiskReplicaTracker lazyWriteReplicaMap,
                         boolean isFinalized)
       throws IOException {
-    File files[] = FileUtil.listFiles(dir);
+    File[] files = fileIoProvider.listFiles(volume, dir);
     for (File file : files) {
       if (file.isDirectory()) {
         addToReplicasMap(volumeMap, file, lazyWriteReplicaMap, isFinalized);
@@ -560,8 +552,9 @@ class BlockPoolSlice {
           continue;
         }
       }
-      if (!Block.isBlockFilename(file))
+      if (!Block.isBlockFilename(file)) {
         continue;
+      }
 
       long genStamp = FsDatasetUtil.getGenerationStampFromFile(
           files, file);
@@ -650,11 +643,11 @@ class BlockPoolSlice {
   private void deleteReplica(final ReplicaInfo replicaToDelete) {
     // Delete the files on disk. Failure here is okay.
     final File blockFile = replicaToDelete.getBlockFile();
-    if (!blockFile.delete()) {
+    if (!fileIoProvider.delete(volume, blockFile)) {
       LOG.warn("Failed to delete block file " + blockFile);
     }
     final File metaFile = replicaToDelete.getMetaFile();
-    if (!metaFile.delete()) {
+    if (!fileIoProvider.delete(volume, metaFile)) {
       LOG.warn("Failed to delete meta file " + metaFile);
     }
   }
@@ -681,7 +674,8 @@ class BlockPoolSlice {
         return 0;
       }
       try (DataInputStream checksumIn = new DataInputStream(
-          new BufferedInputStream(new FileInputStream(metaFile),
+          new BufferedInputStream(
+              fileIoProvider.getFileInputStream(volume, metaFile),
               ioFileBufferSize))) {
         // read and handle the common header here. For now just a version
         final DataChecksum checksum = BlockMetadataHeader.readDataChecksum(
@@ -694,9 +688,10 @@ class BlockPoolSlice {
         if (numChunks == 0) {
           return 0;
         }
-        try (InputStream blockIn = new FileInputStream(blockFile);
+        try (InputStream blockIn = fileIoProvider.getFileInputStream(
+                 volume, blockFile);
              ReplicaInputStreams ris = new ReplicaInputStreams(blockIn,
-                 checksumIn, volume.obtainReference())) {
+                 checksumIn, volume.obtainReference(), fileIoProvider)) {
           ris.skipChecksumFully((numChunks - 1) * checksumSize);
           long lastChunkStartPos = (numChunks - 1) * bytesPerChecksum;
           ris.skipDataFully(lastChunkStartPos);
@@ -715,7 +710,8 @@ class BlockPoolSlice {
           // truncate if extra bytes are present without CRC
           if (blockFile.length() > validFileLength) {
             try (RandomAccessFile blockRAF =
-                     new RandomAccessFile(blockFile, "rw")) {
+                     fileIoProvider.getRandomAccessFile(
+                         volume, blockFile, "rw")) {
               // truncate blockFile
               blockRAF.setLength(validFileLength);
             }
@@ -767,12 +763,14 @@ class BlockPoolSlice {
     }
     FileInputStream inputStream = null;
     try {
-      inputStream = new FileInputStream(replicaFile);
+      inputStream = fileIoProvider.getFileInputStream(volume, replicaFile);
       BlockListAsLongs blocksList =
           BlockListAsLongs.readFrom(inputStream, maxDataLength);
-      Iterator<BlockReportReplica> iterator = blocksList.iterator();
-      while (iterator.hasNext()) {
-        BlockReportReplica replica = iterator.next();
+      if (blocksList == null) {
+        return false;
+      }
+
+      for (BlockReportReplica replica : blocksList) {
         switch (replica.getState()) {
         case FINALIZED:
           addReplicaToReplicasMap(replica, tmpReplicaMap, lazyWriteReplicaMap, 
true);
@@ -809,7 +807,7 @@ class BlockPoolSlice {
       return false;
     }
     finally {
-      if (!replicaFile.delete()) {
+      if (!fileIoProvider.delete(volume, replicaFile)) {
         LOG.info("Failed to delete replica cache file: " +
             replicaFile.getPath());
       }
@@ -823,41 +821,29 @@ class BlockPoolSlice {
         blocksListToPersist.getNumberOfBlocks()== 0) {
       return;
     }
-    File tmpFile = new File(currentDir, REPLICA_CACHE_FILE + ".tmp");
-    if (tmpFile.exists() && !tmpFile.delete()) {
-      LOG.warn("Failed to delete tmp replicas file in " +
-        tmpFile.getPath());
-      return;
-    }
-    File replicaCacheFile = new File(currentDir, REPLICA_CACHE_FILE);
-    if (replicaCacheFile.exists() && !replicaCacheFile.delete()) {
-      LOG.warn("Failed to delete replicas file in " +
-          replicaCacheFile.getPath());
+    final File tmpFile = new File(currentDir, REPLICA_CACHE_FILE + ".tmp");
+    final File replicaCacheFile = new File(currentDir, REPLICA_CACHE_FILE);
+    if (!fileIoProvider.deleteWithExistsCheck(volume, tmpFile) ||
+        !fileIoProvider.deleteWithExistsCheck(volume, replicaCacheFile)) {
       return;
     }
 
     FileOutputStream out = null;
     try {
-      out = new FileOutputStream(tmpFile);
+      out = fileIoProvider.getFileOutputStream(volume, tmpFile);
       blocksListToPersist.writeTo(out);
       out.close();
       // Renaming the tmp file to replicas
-      Files.move(tmpFile, replicaCacheFile);
+      fileIoProvider.moveFile(volume, tmpFile, replicaCacheFile);
     } catch (Exception e) {
       // If write failed, the volume might be bad. Since the cache file is
       // not critical, log the error, delete both the files (tmp and cache)
       // and continue.
       LOG.warn("Failed to write replicas to cache ", e);
-      if (replicaCacheFile.exists() && !replicaCacheFile.delete()) {
-        LOG.warn("Failed to delete replicas file: " +
-            replicaCacheFile.getPath());
-      }
+      fileIoProvider.deleteWithExistsCheck(volume, replicaCacheFile);
     } finally {
       IOUtils.closeStream(out);
-      if (tmpFile.exists() && !tmpFile.delete()) {
-        LOG.warn("Failed to delete tmp file in " +
-            tmpFile.getPath());
-      }
+      fileIoProvider.deleteWithExistsCheck(volume, tmpFile);
     }
   }
 

http://git-wip-us.apache.org/repos/asf/hadoop/blob/954dae26/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetAsyncDiskService.java
----------------------------------------------------------------------
diff --git 
a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetAsyncDiskService.java
 
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetAsyncDiskService.java
index 36d90fd..564e1a8 100644
--- 
a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetAsyncDiskService.java
+++ 
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetAsyncDiskService.java
@@ -19,6 +19,7 @@
 package org.apache.hadoop.hdfs.server.datanode.fsdataset.impl;
 
 import java.io.File;
+import java.io.IOException;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.Map;
@@ -33,6 +34,7 @@ import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
 import org.apache.hadoop.hdfs.server.datanode.DataNode;
+import org.apache.hadoop.hdfs.server.datanode.FileIoProvider;
 import org.apache.hadoop.hdfs.server.datanode.fsdataset.FsVolumeReference;
 import org.apache.hadoop.hdfs.server.datanode.fsdataset.ReplicaOutputStreams;
 import org.apache.hadoop.hdfs.server.protocol.BlockCommand;
@@ -232,6 +234,7 @@ class FsDatasetAsyncDiskService {
     final File metaFile;
     final ExtendedBlock block;
     final String trashDirectory;
+    private final FileIoProvider fileIoProvider;
     
     ReplicaFileDeleteTask(FsVolumeReference volumeRef, File blockFile,
         File metaFile, ExtendedBlock block, String trashDirectory) {
@@ -241,6 +244,7 @@ class FsDatasetAsyncDiskService {
       this.metaFile = metaFile;
       this.block = block;
       this.trashDirectory = trashDirectory;
+      this.fileIoProvider = volume.getFileIoProvider();
     }
 
     @Override
@@ -252,13 +256,17 @@ class FsDatasetAsyncDiskService {
     }
 
     private boolean deleteFiles() {
-      return blockFile.delete() && (metaFile.delete() || !metaFile.exists());
+      return fileIoProvider.delete(volume, blockFile) &&
+          (fileIoProvider.delete(volume, metaFile) ||
+           !fileIoProvider.exists(volume, metaFile));
     }
 
     private boolean moveFiles() {
       File trashDirFile = new File(trashDirectory);
-      if (!trashDirFile.exists() && !trashDirFile.mkdirs()) {
-        LOG.error("Failed to create trash directory " + trashDirectory);
+      try {
+        fileIoProvider.mkdirsWithExistsCheck(
+            volume, trashDirFile);
+      } catch (IOException e) {
         return false;
       }
 
@@ -269,8 +277,14 @@ class FsDatasetAsyncDiskService {
 
       File newBlockFile = new File(trashDirectory, blockFile.getName());
       File newMetaFile = new File(trashDirectory, metaFile.getName());
-      return (blockFile.renameTo(newBlockFile) &&
-              metaFile.renameTo(newMetaFile));
+
+      try {
+        fileIoProvider.renameTo(volume, blockFile, newBlockFile);
+        fileIoProvider.renameTo(volume, metaFile, newMetaFile);
+        return true;
+      } catch(IOException ioe) {
+        return false;
+      }
     }
 
     @Override

http://git-wip-us.apache.org/repos/asf/hadoop/blob/954dae26/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetImpl.java
----------------------------------------------------------------------
diff --git 
a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetImpl.java
 
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetImpl.java
index 7cee8f4..c821989 100644
--- 
a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetImpl.java
+++ 
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetImpl.java
@@ -17,38 +17,10 @@
  */
 package org.apache.hadoop.hdfs.server.datanode.fsdataset.impl;
 
-import java.io.BufferedOutputStream;
-import java.io.DataOutputStream;
-import java.io.EOFException;
-import java.io.File;
-import java.io.FileNotFoundException;
-import java.io.FileInputStream;
-import java.io.FileOutputStream;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.RandomAccessFile;
-import java.nio.ByteBuffer;
-import java.nio.channels.ClosedChannelException;
-import java.nio.channels.FileChannel;
-import java.util.ArrayList;
-import java.util.Collection;
-import java.util.HashMap;
-import java.util.HashSet;
-import java.util.Iterator;
-import java.util.List;
-import java.util.Map;
-import java.util.Set;
-import java.util.concurrent.ConcurrentHashMap;
-import java.util.*;
-import java.util.concurrent.Executor;
-import java.util.concurrent.locks.Condition;
-import java.util.concurrent.TimeUnit;
-
-import javax.management.NotCompliantMBeanException;
-import javax.management.ObjectName;
-import javax.management.StandardMBean;
-
 import com.google.common.annotations.VisibleForTesting;
+import com.google.common.base.Preconditions;
+import com.google.common.collect.Lists;
+import com.google.common.collect.Sets;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.classification.InterfaceAudience;
@@ -57,13 +29,12 @@ import org.apache.hadoop.fs.CommonConfigurationKeys;
 import org.apache.hadoop.fs.FileStatus;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.LocalFileSystem;
-import org.apache.hadoop.fs.permission.FsPermission;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.fs.StorageType;
+import org.apache.hadoop.fs.permission.FsPermission;
 import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.hdfs.DFSUtilClient;
 import org.apache.hadoop.hdfs.ExtendedBlockId;
-import org.apache.hadoop.util.AutoCloseableLock;
 import org.apache.hadoop.hdfs.protocol.Block;
 import org.apache.hadoop.hdfs.protocol.BlockListAsLongs;
 import org.apache.hadoop.hdfs.protocol.BlockLocalPathInfo;
@@ -74,11 +45,10 @@ import 
org.apache.hadoop.hdfs.protocol.RecoveryInProgressException;
 import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.ReplicaState;
 import org.apache.hadoop.hdfs.server.common.Storage;
 import org.apache.hadoop.hdfs.server.datanode.BlockMetadataHeader;
-import org.apache.hadoop.hdfs.server.datanode.BlockScanner;
 import org.apache.hadoop.hdfs.server.datanode.DataNode;
-import org.apache.hadoop.hdfs.server.datanode.metrics.DataNodeMetricHelper;
 import org.apache.hadoop.hdfs.server.datanode.DataStorage;
 import org.apache.hadoop.hdfs.server.datanode.DatanodeUtil;
+import org.apache.hadoop.hdfs.server.datanode.FileIoProvider;
 import org.apache.hadoop.hdfs.server.datanode.FinalizedReplica;
 import org.apache.hadoop.hdfs.server.datanode.Replica;
 import org.apache.hadoop.hdfs.server.datanode.ReplicaAlreadyExistsException;
@@ -101,6 +71,7 @@ import 
org.apache.hadoop.hdfs.server.datanode.fsdataset.ReplicaOutputStreams;
 import 
org.apache.hadoop.hdfs.server.datanode.fsdataset.RoundRobinVolumeChoosingPolicy;
 import org.apache.hadoop.hdfs.server.datanode.fsdataset.VolumeChoosingPolicy;
 import 
org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.RamDiskReplicaTracker.RamDiskReplica;
+import org.apache.hadoop.hdfs.server.datanode.metrics.DataNodeMetricHelper;
 import org.apache.hadoop.hdfs.server.datanode.metrics.FSDatasetMBean;
 import 
org.apache.hadoop.hdfs.server.protocol.BlockRecoveryCommand.RecoveringBlock;
 import org.apache.hadoop.hdfs.server.protocol.DatanodeStorage;
@@ -115,6 +86,7 @@ import org.apache.hadoop.metrics2.MetricsCollector;
 import org.apache.hadoop.metrics2.MetricsSystem;
 import org.apache.hadoop.metrics2.lib.DefaultMetricsSystem;
 import org.apache.hadoop.metrics2.util.MBeans;
+import org.apache.hadoop.util.AutoCloseableLock;
 import org.apache.hadoop.util.Daemon;
 import org.apache.hadoop.util.DataChecksum;
 import org.apache.hadoop.util.DiskChecker.DiskErrorException;
@@ -124,9 +96,34 @@ import org.apache.hadoop.util.ReflectionUtils;
 import org.apache.hadoop.util.Time;
 import org.apache.hadoop.util.Timer;
 
-import com.google.common.base.Preconditions;
-import com.google.common.collect.Lists;
-import com.google.common.collect.Sets;
+import javax.management.NotCompliantMBeanException;
+import javax.management.ObjectName;
+import javax.management.StandardMBean;
+import java.io.BufferedOutputStream;
+import java.io.DataOutputStream;
+import java.io.EOFException;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.RandomAccessFile;
+import java.nio.ByteBuffer;
+import java.nio.channels.ClosedChannelException;
+import java.nio.channels.FileChannel;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.Executor;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.locks.Condition;
 
 /**************************************************
  * FSDataset manages a set of data blocks.  Each block
@@ -195,10 +192,16 @@ class FsDatasetImpl implements FsDatasetSpi<FsVolumeImpl> 
{
   public Block getStoredBlock(String bpid, long blkid)
       throws IOException {
     try(AutoCloseableLock lock = datasetLock.acquire()) {
-      File blockfile = getFile(bpid, blkid, false);
+      File blockfile = null;
+
+      ReplicaInfo info = volumeMap.get(bpid, blkid);
+      if (info != null) {
+        blockfile = info.getBlockFile();
+      }
       if (blockfile == null) {
         return null;
       }
+
       final File metafile = FsDatasetUtil.findMetaFile(blockfile);
       final long gs = FsDatasetUtil.parseGenerationStamp(blockfile, metafile);
       return new Block(blkid, blockfile.length(), gs);
@@ -233,17 +236,30 @@ class FsDatasetImpl implements FsDatasetSpi<FsVolumeImpl> 
{
   public LengthInputStream getMetaDataInputStream(ExtendedBlock b)
       throws IOException {
     File meta = FsDatasetUtil.getMetaFile(getBlockFile(b), 
b.getGenerationStamp());
+    FsVolumeSpi volume = null;
+
     if (meta == null || !meta.exists()) {
       return null;
     }
+
+    try (AutoCloseableLock lock = datasetLock.acquire()) {
+      final ReplicaInfo replicaInfo = getReplicaInfo(b);
+      if (replicaInfo != null) {
+        volume = replicaInfo.getVolume();
+      }
+    }
+
     if (isNativeIOAvailable) {
       return new LengthInputStream(
-          NativeIO.getShareDeleteFileInputStream(meta),
+          datanode.getFileIoProvider().getShareDeleteFileInputStream(
+              volume, meta, 0),
           meta.length());
     }
-    return new LengthInputStream(new FileInputStream(meta), meta.length());
+    return new LengthInputStream(
+        datanode.getFileIoProvider().getFileInputStream(volume, meta),
+        meta.length());
   }
-    
+
   final DataNode datanode;
   final DataStorage dataStorage;
   private final FsVolumeList volumes;
@@ -758,42 +774,49 @@ class FsDatasetImpl implements FsDatasetSpi<FsVolumeImpl> 
{
     return f;
   }
 
-  /**
-   * Return the File associated with a block, without first
-   * checking that it exists. This should be used when the
-   * next operation is going to open the file for read anyway,
-   * and thus the exists check is redundant.
-   *
-   * @param touch if true then update the last access timestamp of the
-   *              block. Currently used for blocks on transient storage.
-   */
-  private File getBlockFileNoExistsCheck(ExtendedBlock b,
-                                         boolean touch)
-      throws IOException {
-    final File f;
-    try(AutoCloseableLock lock = datasetLock.acquire()) {
-      f = getFile(b.getBlockPoolId(), b.getLocalBlock().getBlockId(), touch);
+  @Override // FsDatasetSpi
+  public InputStream getBlockInputStream(ExtendedBlock b,
+      long seekOffset) throws IOException {
+    ReplicaInfo info;
+    try (AutoCloseableLock lock = datasetLock.acquire()) {
+      info = volumeMap.get(b.getBlockPoolId(), b.getLocalBlock());
     }
-    if (f == null) {
-      throw new IOException("Block " + b + " is not valid");
+
+    final File blockFile = info != null ? info.getBlockFile() : null;
+
+    if (blockFile != null && info.getVolume().isTransientStorage()) {
+      ramDiskReplicaTracker.touch(b.getBlockPoolId(), b.getBlockId());
+      datanode.getMetrics().incrRamDiskBlocksReadHits();
+    }
+
+    if(blockFile != null &&
+        datanode.getFileIoProvider().exists(
+            info.getVolume(), blockFile)) {
+      return getDataInputStream(info, seekOffset);
+    } else {
+      throw new IOException("Block " + b + " is not valid. " +
+          "Expected block file at " + blockFile + " does not exist.");
     }
-    return f;
   }
 
-  @Override // FsDatasetSpi
-  public InputStream getBlockInputStream(ExtendedBlock b,
-      long seekOffset) throws IOException {
-    File blockFile = getBlockFileNoExistsCheck(b, true);
-    if (isNativeIOAvailable) {
-      return NativeIO.getShareDeleteFileInputStream(blockFile, seekOffset);
+  private InputStream getDataInputStream(
+      ReplicaInfo info, long seekOffset) throws IOException {
+    FileInputStream fis;
+    final File blockFile = info.getBlockFile();
+    final FileIoProvider fileIoProvider = datanode.getFileIoProvider();
+    if (NativeIO.isAvailable()) {
+      fis = fileIoProvider.getShareDeleteFileInputStream(
+          info.getVolume(), blockFile, seekOffset);
     } else {
       try {
-        return openAndSeek(blockFile, seekOffset);
+        fis = fileIoProvider.openAndSeek(
+            info.getVolume(), blockFile, seekOffset);
       } catch (FileNotFoundException fnfe) {
-        throw new IOException("Block " + b + " is not valid. " +
-            "Expected block file at " + blockFile + " does not exist.");
+        throw new IOException("Expected block file at " + blockFile +
+            " does not exist.");
       }
     }
+    return fis;
   }
 
   /**
@@ -846,53 +869,40 @@ class FsDatasetImpl implements FsDatasetSpi<FsVolumeImpl> 
{
   public ReplicaInputStreams getTmpInputStreams(ExtendedBlock b,
       long blkOffset, long metaOffset) throws IOException {
     try(AutoCloseableLock lock = datasetLock.acquire()) {
-      ReplicaInfo info = getReplicaInfo(b);
+      final ReplicaInfo info = getReplicaInfo(b);
+      final FileIoProvider fileIoProvider = datanode.getFileIoProvider();
       FsVolumeReference ref = info.getVolume().obtainReference();
+      InputStream blockInStream = null;
+      InputStream metaInStream = null;
       try {
-        InputStream blockInStream = openAndSeek(info.getBlockFile(), 
blkOffset);
-        try {
-          InputStream metaInStream =
-              openAndSeek(info.getMetaFile(), metaOffset);
-          return new ReplicaInputStreams(blockInStream, metaInStream, ref);
-        } catch (IOException e) {
-          IOUtils.cleanup(null, blockInStream);
-          throw e;
-        }
+        blockInStream = fileIoProvider.openAndSeek(
+            info.getVolume(), info.getBlockFile(), blkOffset);
+        metaInStream = fileIoProvider.openAndSeek(
+                  info.getVolume(), info.getMetaFile(), metaOffset);
+        return new ReplicaInputStreams(
+            blockInStream, metaInStream, ref, fileIoProvider);
       } catch (IOException e) {
-        IOUtils.cleanup(null, ref);
+        IOUtils.cleanup(null, ref, blockInStream);
         throw e;
       }
     }
   }
 
-  private static FileInputStream openAndSeek(File file, long offset)
-      throws IOException {
-    RandomAccessFile raf = null;
-    try {
-      raf = new RandomAccessFile(file, "r");
-      if (offset > 0) {
-        raf.seek(offset);
-      }
-      return new FileInputStream(raf.getFD());
-    } catch(IOException ioe) {
-      IOUtils.cleanup(null, raf);
-      throw ioe;
-    }
-  }
-
-  static File moveBlockFiles(Block b, File srcfile, File destdir)
-      throws IOException {
+  File moveBlockFiles(
+      FsVolumeSpi volume, Block b, File srcfile,
+      File destdir) throws IOException {
     final File dstfile = new File(destdir, b.getBlockName());
     final File srcmeta = FsDatasetUtil.getMetaFile(srcfile, 
b.getGenerationStamp());
     final File dstmeta = FsDatasetUtil.getMetaFile(dstfile, 
b.getGenerationStamp());
+    final FileIoProvider fileIoProvider = datanode.getFileIoProvider();
     try {
-      NativeIO.renameTo(srcmeta, dstmeta);
+      fileIoProvider.renameTo(volume, srcmeta, dstmeta);
     } catch (IOException e) {
       throw new IOException("Failed to move meta file for " + b
           + " from " + srcmeta + " to " + dstmeta, e);
     }
     try {
-      NativeIO.renameTo(srcfile, dstfile);
+      fileIoProvider.renameTo(volume, srcfile, dstfile);
     } catch (IOException e) {
       throw new IOException("Failed to move block file for " + b
           + " from " + srcfile + " to " + dstfile.getAbsolutePath(), e);
@@ -1031,8 +1041,13 @@ class FsDatasetImpl implements 
FsDatasetSpi<FsVolumeImpl> {
   static void computeChecksum(File srcMeta, File dstMeta,
       File blockFile, int smallBufferSize, final Configuration conf)
       throws IOException {
-    final DataChecksum checksum = BlockMetadataHeader.readDataChecksum(srcMeta,
-        DFSUtilClient.getIoFileBufferSize(conf));
+    DataChecksum checksum;
+
+    try (FileInputStream fis = new FileInputStream(srcMeta)) {
+      checksum = BlockMetadataHeader.readDataChecksum(fis,
+          DFSUtilClient.getIoFileBufferSize(conf), srcMeta);
+    }
+
     final byte[] data = new byte[1 << 16];
     final byte[] crcs = new byte[checksum.getChecksumSize(data.length)];
 
@@ -1051,7 +1066,8 @@ class FsDatasetImpl implements FsDatasetSpi<FsVolumeImpl> 
{
 
       int offset = 0;
       try (InputStream dataIn = isNativeIOAvailable ?
-          NativeIO.getShareDeleteFileInputStream(blockFile) :
+          new FileInputStream(NativeIO.getShareDeleteFileDescriptor(
+              blockFile, 0)) :
           new FileInputStream(blockFile)) {
 
         for (int n; (n = dataIn.read(data, offset, data.length - offset)) != 
-1; ) {
@@ -1078,7 +1094,7 @@ class FsDatasetImpl implements FsDatasetSpi<FsVolumeImpl> 
{
     }
   }
 
-  static private void truncateBlock(File blockFile, File metaFile,
+  private void truncateBlock(FsVolumeSpi volume, File blockFile, File metaFile,
       long oldlen, long newlen) throws IOException {
     LOG.info("truncateBlock: blockFile=" + blockFile
         + ", metaFile=" + metaFile
@@ -1093,7 +1109,13 @@ class FsDatasetImpl implements 
FsDatasetSpi<FsVolumeImpl> {
           + ") to newlen (=" + newlen + ")");
     }
 
-    DataChecksum dcs = BlockMetadataHeader.readHeader(metaFile).getChecksum();
+    final FileIoProvider fileIoProvider = datanode.getFileIoProvider();
+    DataChecksum dcs;
+    try (FileInputStream fis = fileIoProvider.getFileInputStream(
+        volume, metaFile)) {
+      dcs = BlockMetadataHeader.readHeader(fis).getChecksum();
+    }
+
     int checksumsize = dcs.getChecksumSize();
     int bpc = dcs.getBytesPerChecksum();
     long n = (newlen - 1)/bpc + 1;
@@ -1102,16 +1124,15 @@ class FsDatasetImpl implements 
FsDatasetSpi<FsVolumeImpl> {
     int lastchunksize = (int)(newlen - lastchunkoffset);
     byte[] b = new byte[Math.max(lastchunksize, checksumsize)];
 
-    RandomAccessFile blockRAF = new RandomAccessFile(blockFile, "rw");
-    try {
+
+    try (final RandomAccessFile blockRAF = fileIoProvider.getRandomAccessFile(
+        volume, blockFile, "rw")) {
       //truncate blockFile
       blockRAF.setLength(newlen);
 
       //read last chunk
       blockRAF.seek(lastchunkoffset);
       blockRAF.readFully(b, 0, lastchunksize);
-    } finally {
-      blockRAF.close();
     }
 
     //compute checksum
@@ -1119,13 +1140,11 @@ class FsDatasetImpl implements 
FsDatasetSpi<FsVolumeImpl> {
     dcs.writeValue(b, 0, false);
 
     //update metaFile
-    RandomAccessFile metaRAF = new RandomAccessFile(metaFile, "rw");
-    try {
+    try (final RandomAccessFile metaRAF = fileIoProvider.getRandomAccessFile(
+        volume, metaFile, "rw")) {
       metaRAF.setLength(newmetalen);
       metaRAF.seek(newmetalen - checksumsize);
       metaRAF.write(b, 0, checksumsize);
-    } finally {
-      metaRAF.close();
     }
   }
 
@@ -1220,7 +1239,8 @@ class FsDatasetImpl implements FsDatasetSpi<FsVolumeImpl> 
{
         LOG.debug("Renaming " + oldmeta + " to " + newmeta);
       }
       try {
-        NativeIO.renameTo(oldmeta, newmeta);
+        datanode.getFileIoProvider().renameTo(
+            replicaInfo.getVolume(), oldmeta, newmeta);
       } catch (IOException e) {
         throw new IOException("Block " + replicaInfo + " reopen failed. " +
             " Unable to move meta file  " + oldmeta +
@@ -1233,10 +1253,12 @@ class FsDatasetImpl implements 
FsDatasetSpi<FsVolumeImpl> {
             + ", file length=" + blkfile.length());
       }
       try {
-        NativeIO.renameTo(blkfile, newBlkFile);
+        datanode.getFileIoProvider().renameTo(
+            replicaInfo.getVolume(), blkfile, newBlkFile);
       } catch (IOException e) {
         try {
-          NativeIO.renameTo(newmeta, oldmeta);
+          datanode.getFileIoProvider().renameTo(
+              replicaInfo.getVolume(), newmeta, oldmeta);
         } catch (IOException ex) {
           LOG.warn("Cannot move meta file " + newmeta +
               "back to the finalized directory " + oldmeta, ex);
@@ -1389,7 +1411,8 @@ class FsDatasetImpl implements FsDatasetSpi<FsVolumeImpl> 
{
       LOG.debug("Renaming " + oldmeta + " to " + newmeta);
     }
     try {
-      NativeIO.renameTo(oldmeta, newmeta);
+      datanode.getFileIoProvider().renameTo(
+          replicaInfo.getVolume(), oldmeta, newmeta);
     } catch (IOException e) {
       replicaInfo.setGenerationStamp(oldGS); // restore old GS
       throw new IOException("Block " + replicaInfo + " reopen failed. " +
@@ -1520,7 +1543,9 @@ class FsDatasetImpl implements FsDatasetSpi<FsVolumeImpl> 
{
         // any corrupt data written after the acked length can go unnoticed.
         if (numBytes > bytesAcked) {
           final File replicafile = rbw.getBlockFile();
-          truncateBlock(replicafile, rbw.getMetaFile(), numBytes, bytesAcked);
+          truncateBlock(
+              rbw.getVolume(), replicafile, rbw.getMetaFile(),
+              numBytes, bytesAcked);
           rbw.setNumBytes(bytesAcked);
           rbw.setLastChecksumAndDataLen(bytesAcked, null);
         }
@@ -1585,8 +1610,8 @@ class FsDatasetImpl implements FsDatasetSpi<FsVolumeImpl> 
{
 
       // move block files to the rbw directory
       BlockPoolSlice bpslice = v.getBlockPoolSlice(b.getBlockPoolId());
-      final File dest = moveBlockFiles(b.getLocalBlock(), temp.getBlockFile(),
-          bpslice.getRbwDir());
+      final File dest = moveBlockFiles(
+          v, b.getLocalBlock(), temp.getBlockFile(), bpslice.getRbwDir());
       // create RBW
       final ReplicaBeingWritten rbw = new ReplicaBeingWritten(
           blockId, numBytes, expectedGs,
@@ -2318,16 +2343,21 @@ class FsDatasetImpl implements 
FsDatasetSpi<FsVolumeImpl> {
         return;
       }
 
-      final long diskGS = diskMetaFile != null && diskMetaFile.exists() ?
+      final FileIoProvider fileIoProvider = datanode.getFileIoProvider();
+      final boolean diskMetaFileExists = diskMetaFile != null &&
+          fileIoProvider.exists(vol, diskMetaFile);
+      final boolean diskFileExists = diskFile != null &&
+          fileIoProvider.exists(vol, diskFile);
+
+      final long diskGS = diskMetaFileExists ?
           Block.getGenerationStamp(diskMetaFile.getName()) :
-            HdfsConstants.GRANDFATHER_GENERATION_STAMP;
+          HdfsConstants.GRANDFATHER_GENERATION_STAMP;
 
-      if (diskFile == null || !diskFile.exists()) {
+      if (!diskFileExists) {
         if (memBlockInfo == null) {
           // Block file does not exist and block does not exist in memory
           // If metadata file exists then delete it
-          if (diskMetaFile != null && diskMetaFile.exists()
-              && diskMetaFile.delete()) {
+          if (diskMetaFileExists && fileIoProvider.delete(vol, diskMetaFile)) {
             LOG.warn("Deleted a metadata file without a block "
                 + diskMetaFile.getAbsolutePath());
           }
@@ -2343,8 +2373,7 @@ class FsDatasetImpl implements FsDatasetSpi<FsVolumeImpl> 
{
           LOG.warn("Removed block " + blockId
               + " from memory with missing block file on the disk");
           // Finally remove the metadata file
-          if (diskMetaFile != null && diskMetaFile.exists()
-              && diskMetaFile.delete()) {
+          if (diskMetaFileExists && fileIoProvider.delete(vol, diskMetaFile)) {
             LOG.warn("Deleted a metadata file for the deleted block "
                 + diskMetaFile.getAbsolutePath());
           }
@@ -2374,10 +2403,12 @@ class FsDatasetImpl implements 
FsDatasetSpi<FsVolumeImpl> {
        */
       // Compare block files
       File memFile = memBlockInfo.getBlockFile();
-      if (memFile.exists()) {
+      final boolean memFileExists = memFile != null &&
+          fileIoProvider.exists(vol, memFile);
+      if (memFileExists) {
         if (memFile.compareTo(diskFile) != 0) {
           if (diskMetaFile.exists()) {
-            if (memBlockInfo.getMetaFile().exists()) {
+            if (fileIoProvider.exists(vol, memBlockInfo.getMetaFile())) {
               // We have two sets of block+meta files. Decide which one to
               // keep.
               ReplicaInfo diskBlockInfo = new FinalizedReplica(
@@ -2386,7 +2417,7 @@ class FsDatasetImpl implements FsDatasetSpi<FsVolumeImpl> 
{
                   memBlockInfo, diskBlockInfo, volumeMap);
             }
           } else {
-            if (!diskFile.delete()) {
+            if (!fileIoProvider.delete(vol, diskFile)) {
               LOG.warn("Failed to delete " + diskFile + ". Will retry on next 
scan");
             }
           }
@@ -2410,9 +2441,9 @@ class FsDatasetImpl implements FsDatasetSpi<FsVolumeImpl> 
{
 
       // Compare generation stamp
       if (memBlockInfo.getGenerationStamp() != diskGS) {
-        File memMetaFile = FsDatasetUtil.getMetaFile(diskFile, 
+        File memMetaFile = FsDatasetUtil.getMetaFile(diskFile,
             memBlockInfo.getGenerationStamp());
-        if (memMetaFile.exists()) {
+        if (fileIoProvider.exists(vol, memMetaFile)) {
           if (memMetaFile.compareTo(diskMetaFile) != 0) {
             LOG.warn("Metadata file in memory "
                 + memMetaFile.getAbsolutePath()
@@ -2663,7 +2694,9 @@ class FsDatasetImpl implements FsDatasetSpi<FsVolumeImpl> 
{
     }
     if (rur.getNumBytes() > newlength) {
       rur.breakHardLinksIfNeeded();
-      truncateBlock(blockFile, metaFile, rur.getNumBytes(), newlength);
+      truncateBlock(
+          rur.getVolume(), blockFile, metaFile,
+          rur.getNumBytes(), newlength);
       if(!copyOnTruncate) {
         // update RUR with the new length
         rur.setNumBytes(newlength);

http://git-wip-us.apache.org/repos/asf/hadoop/blob/954dae26/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetUtil.java
----------------------------------------------------------------------
diff --git 
a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetUtil.java
 
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetUtil.java
index 4af8773..40ccfc2 100644
--- 
a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetUtil.java
+++ 
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetUtil.java
@@ -18,8 +18,10 @@
 package org.apache.hadoop.hdfs.server.datanode.fsdataset.impl;
 
 import java.io.File;
+import java.io.FileDescriptor;
 import java.io.FilenameFilter;
 import java.io.IOException;
+import java.io.RandomAccessFile;
 import java.util.Arrays;
 
 import com.google.common.base.Preconditions;
@@ -28,6 +30,7 @@ import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.hdfs.protocol.Block;
 import org.apache.hadoop.hdfs.protocol.HdfsConstants;
 import org.apache.hadoop.hdfs.server.datanode.DatanodeUtil;
+import org.apache.hadoop.io.IOUtils;
 
 /** Utility methods. */
 @InterfaceAudience.Private
@@ -73,6 +76,21 @@ public class FsDatasetUtil {
     return matches[0];
   }
 
+  public static FileDescriptor openAndSeek(File file, long offset)
+      throws IOException {
+    RandomAccessFile raf = null;
+    try {
+      raf = new RandomAccessFile(file, "r");
+      if (offset > 0) {
+        raf.seek(offset);
+      }
+      return raf.getFD();
+    } catch(IOException ioe) {
+      IOUtils.cleanup(null, raf);
+      throw ioe;
+    }
+  }
+
   /**
    * Find the meta-file for the specified block file
    * and then return the generation stamp from the name of the meta-file.

http://git-wip-us.apache.org/repos/asf/hadoop/blob/954dae26/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsVolumeImpl.java
----------------------------------------------------------------------
diff --git 
a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsVolumeImpl.java
 
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsVolumeImpl.java
index ecd72ff..9955bf4 100644
--- 
a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsVolumeImpl.java
+++ 
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsVolumeImpl.java
@@ -19,13 +19,12 @@ package 
org.apache.hadoop.hdfs.server.datanode.fsdataset.impl;
 
 import java.io.BufferedWriter;
 import java.io.File;
-import java.io.FileOutputStream;
+import java.io.FileInputStream;
 import java.io.FilenameFilter;
 import java.io.IOException;
 import java.io.OutputStreamWriter;
 import java.io.RandomAccessFile;
 import java.nio.channels.ClosedChannelException;
-import java.nio.file.Files;
 import java.nio.file.Paths;
 import java.nio.file.StandardCopyOption;
 import java.util.Collections;
@@ -44,8 +43,8 @@ import java.util.concurrent.atomic.AtomicLong;
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.DF;
-import org.apache.hadoop.fs.FileUtil;
 import org.apache.hadoop.fs.StorageType;
+import org.apache.hadoop.hdfs.server.datanode.FileIoProvider;
 import org.apache.hadoop.hdfs.server.datanode.BlockMetadataHeader;
 import org.apache.hadoop.hdfs.server.datanode.checker.VolumeCheckResult;
 import org.apache.hadoop.hdfs.server.datanode.fsdataset.FsDatasetSpi;
@@ -60,7 +59,6 @@ import org.apache.hadoop.util.DataChecksum;
 import org.apache.hadoop.hdfs.server.datanode.fsdataset.FsVolumeReference;
 import org.apache.hadoop.hdfs.server.datanode.fsdataset.FsVolumeSpi;
 import org.apache.hadoop.hdfs.server.protocol.DatanodeStorage;
-import org.apache.hadoop.io.IOUtils;
 import org.apache.hadoop.util.CloseableReferenceCount;
 import org.apache.hadoop.util.DiskChecker.DiskErrorException;
 import org.apache.hadoop.util.StringUtils;
@@ -111,6 +109,7 @@ public class FsVolumeImpl implements FsVolumeSpi {
   // limit the visible capacity for tests. If negative, then we just
   // query from the filesystem.
   protected volatile long configuredCapacity;
+  private final FileIoProvider fileIoProvider;
 
   /**
    * Per-volume worker pool that processes new blocks to cache.
@@ -134,6 +133,9 @@ public class FsVolumeImpl implements FsVolumeSpi {
     this.usage = new DF(parent, conf);
     this.storageType = storageType;
     this.configuredCapacity = -1;
+    // dataset.datanode may be null in some tests.
+    this.fileIoProvider = dataset.datanode != null ?
+        dataset.datanode.getFileIoProvider() : new FileIoProvider(conf);
     cacheExecutor = initializeCacheExecutor(parent);
   }
 
@@ -622,8 +624,8 @@ public class FsVolumeImpl implements FsVolumeSpi {
      */
     private String getNextSubDir(String prev, File dir)
           throws IOException {
-      List<String> children =
-          IOUtils.listDirectory(dir, SubdirFilter.INSTANCE);
+      List<String> children = fileIoProvider.listDirectory(
+          FsVolumeImpl.this, dir, SubdirFilter.INSTANCE);
       cache = null;
       cacheMs = 0;
       if (children.size() == 0) {
@@ -676,8 +678,8 @@ public class FsVolumeImpl implements FsVolumeSpi {
       }
       File dir = Paths.get(bpidDir.getAbsolutePath(), "current", "finalized",
                     state.curFinalizedDir, state.curFinalizedSubDir).toFile();
-      List<String> entries =
-          IOUtils.listDirectory(dir, BlockFileFilter.INSTANCE);
+      List<String> entries = fileIoProvider.listDirectory(
+          FsVolumeImpl.this, dir, BlockFileFilter.INSTANCE);
       if (entries.size() == 0) {
         entries = null;
       } else {
@@ -784,19 +786,18 @@ public class FsVolumeImpl implements FsVolumeSpi {
     public void save() throws IOException {
       state.lastSavedMs = Time.now();
       boolean success = false;
-      try (BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(
-                new FileOutputStream(getTempSaveFile(), false), "UTF-8"))) {
+      try (BufferedWriter writer = new BufferedWriter(
+          new OutputStreamWriter(fileIoProvider.getFileOutputStream(
+              FsVolumeImpl.this, getTempSaveFile()), "UTF-8"))) {
         WRITER.writeValue(writer, state);
         success = true;
       } finally {
         if (!success) {
-          if (getTempSaveFile().delete()) {
-            LOG.debug("save({}, {}): error deleting temporary file.",
-                storageID, bpid);
-          }
+          fileIoProvider.delete(FsVolumeImpl.this, getTempSaveFile());
         }
       }
-      Files.move(getTempSaveFile().toPath(), getSaveFile().toPath(),
+      fileIoProvider.move(FsVolumeImpl.this,
+          getTempSaveFile().toPath(), getSaveFile().toPath(),
           StandardCopyOption.ATOMIC_MOVE);
       if (LOG.isTraceEnabled()) {
         LOG.trace("save({}, {}): saved {}", storageID, bpid,
@@ -982,11 +983,12 @@ public class FsVolumeImpl implements FsVolumeSpi {
     File finalizedDir = new File(bpCurrentDir,
         DataStorage.STORAGE_DIR_FINALIZED);
     File rbwDir = new File(bpCurrentDir, DataStorage.STORAGE_DIR_RBW);
-    if (finalizedDir.exists() && !DatanodeUtil.dirNoFilesRecursive(
-        finalizedDir)) {
+    if (fileIoProvider.exists(this, finalizedDir) &&
+        !DatanodeUtil.dirNoFilesRecursive(this, finalizedDir, fileIoProvider)) 
{
       return false;
     }
-    if (rbwDir.exists() && FileUtil.list(rbwDir).length != 0) {
+    if (fileIoProvider.exists(this, rbwDir) &&
+        fileIoProvider.list(this, rbwDir).length != 0) {
       return false;
     }
     return true;
@@ -1007,35 +1009,38 @@ public class FsVolumeImpl implements FsVolumeSpi {
         DataStorage.STORAGE_DIR_LAZY_PERSIST);
     File rbwDir = new File(bpCurrentDir, DataStorage.STORAGE_DIR_RBW);
     if (force) {
-      DataStorage.fullyDelete(bpDir);
+      fileIoProvider.fullyDelete(this, bpDir);
     } else {
-      if (!rbwDir.delete()) {
+      if (!fileIoProvider.delete(this, rbwDir)) {
         throw new IOException("Failed to delete " + rbwDir);
       }
-      if (!DatanodeUtil.dirNoFilesRecursive(finalizedDir) ||
-          !FileUtil.fullyDelete(finalizedDir)) {
+      if (!DatanodeUtil.dirNoFilesRecursive(
+              this, finalizedDir, fileIoProvider) ||
+          !fileIoProvider.fullyDelete(
+              this, finalizedDir)) {
         throw new IOException("Failed to delete " + finalizedDir);
       }
       if (lazypersistDir.exists() &&
-        ((!DatanodeUtil.dirNoFilesRecursive(lazypersistDir) ||
-          !FileUtil.fullyDelete(lazypersistDir)))) {
+          ((!DatanodeUtil.dirNoFilesRecursive(
+              this, lazypersistDir, fileIoProvider) ||
+              !fileIoProvider.fullyDelete(this, lazypersistDir)))) {
         throw new IOException("Failed to delete " + lazypersistDir);
       }
-      DataStorage.fullyDelete(tmpDir);
-      for (File f : FileUtil.listFiles(bpCurrentDir)) {
-        if (!f.delete()) {
+      fileIoProvider.fullyDelete(this, tmpDir);
+      for (File f : fileIoProvider.listFiles(this, bpCurrentDir)) {
+        if (!fileIoProvider.delete(this, f)) {
           throw new IOException("Failed to delete " + f);
         }
       }
-      if (!bpCurrentDir.delete()) {
+      if (!fileIoProvider.delete(this, bpCurrentDir)) {
         throw new IOException("Failed to delete " + bpCurrentDir);
       }
-      for (File f : FileUtil.listFiles(bpDir)) {
-        if (!f.delete()) {
+      for (File f : fileIoProvider.listFiles(this, bpDir)) {
+        if (!fileIoProvider.delete(this, f)) {
           throw new IOException("Failed to delete " + f);
         }
       }
-      if (!bpDir.delete()) {
+      if (!fileIoProvider.delete(this, bpDir)) {
         throw new IOException("Failed to delete " + bpDir);
       }
     }
@@ -1059,9 +1064,13 @@ public class FsVolumeImpl implements FsVolumeSpi {
   @Override
   public byte[] loadLastPartialChunkChecksum(
       File blockFile, File metaFile) throws IOException {
-    // readHeader closes the temporary FileInputStream.
-    DataChecksum dcs = BlockMetadataHeader
-        .readHeader(metaFile).getChecksum();
+    DataChecksum dcs;
+
+    try (FileInputStream fis = fileIoProvider.getFileInputStream(
+        this, metaFile)) {
+      dcs = BlockMetadataHeader.readHeader(fis).getChecksum();
+    }
+
     final int checksumSize = dcs.getChecksumSize();
     final long onDiskLen = blockFile.length();
     final int bytesPerChecksum = dcs.getBytesPerChecksum();
@@ -1075,7 +1084,8 @@ public class FsVolumeImpl implements FsVolumeSpi {
     long offsetInChecksum = BlockMetadataHeader.getHeaderSize() +
         (onDiskLen / bytesPerChecksum) * checksumSize;
     byte[] lastChecksum = new byte[checksumSize];
-    try (RandomAccessFile raf = new RandomAccessFile(metaFile, "r")) {
+    try (RandomAccessFile raf = fileIoProvider.getRandomAccessFile(
+        this, metaFile, "r")) {
       raf.seek(offsetInChecksum);
       int readBytes = raf.read(lastChecksum, 0, checksumSize);
       if (readBytes == -1) {
@@ -1090,4 +1100,9 @@ public class FsVolumeImpl implements FsVolumeSpi {
     }
     return lastChecksum;
   }
+
+  @Override
+  public FileIoProvider getFileIoProvider() {
+    return fileIoProvider;
+  }
 }

http://git-wip-us.apache.org/repos/asf/hadoop/blob/954dae26/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestFileAppend.java
----------------------------------------------------------------------
diff --git 
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestFileAppend.java
 
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestFileAppend.java
index 0bb95d2..fbf09fb 100644
--- 
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestFileAppend.java
+++ 
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestFileAppend.java
@@ -702,7 +702,7 @@ public class TestFileAppend{
       ReplicaBeingWritten rbw =
           (ReplicaBeingWritten)replicaHandler.getReplica();
       ReplicaOutputStreams
-          outputStreams = rbw.createStreams(false, DEFAULT_CHECKSUM, 300);
+          outputStreams = rbw.createStreams(false, DEFAULT_CHECKSUM);
       OutputStream dataOutput = outputStreams.getDataOut();
 
       byte[] appendBytes = new byte[1];

http://git-wip-us.apache.org/repos/asf/hadoop/blob/954dae26/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/SimulatedFSDataset.java
----------------------------------------------------------------------
diff --git 
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/SimulatedFSDataset.java
 
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/SimulatedFSDataset.java
index 80481c2..c10d84b 100644
--- 
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/SimulatedFSDataset.java
+++ 
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/SimulatedFSDataset.java
@@ -116,7 +116,8 @@ public class SimulatedFSDataset implements 
FsDatasetSpi<FsVolumeSpi> {
       DatanodeStorage.State.NORMAL;
 
   private final AutoCloseableLock datasetLock;
-  
+  private final FileIoProvider fileIoProvider;
+
   static final byte[] nullCrcFileData;
   static {
     DataChecksum checksum = DataChecksum.newDataChecksum(
@@ -254,8 +255,8 @@ public class SimulatedFSDataset implements 
FsDatasetSpi<FsVolumeSpi> {
     }
 
     @Override
-    synchronized public ReplicaOutputStreams createStreams(boolean isCreate, 
-        DataChecksum requestedChecksum, long slowLogThresholdMs)
+    synchronized public ReplicaOutputStreams createStreams(boolean isCreate,
+        DataChecksum requestedChecksum)
         throws IOException {
       if (finalized) {
         throw new IOException("Trying to write to a finalized replica "
@@ -263,7 +264,7 @@ public class SimulatedFSDataset implements 
FsDatasetSpi<FsVolumeSpi> {
       } else {
         SimulatedOutputStream crcStream = new SimulatedOutputStream();
         return new ReplicaOutputStreams(oStream, crcStream, requestedChecksum,
-            volume.isTransientStorage(), slowLogThresholdMs);
+            volume, fileIoProvider);
       }
     }
 
@@ -444,12 +445,15 @@ public class SimulatedFSDataset implements 
FsDatasetSpi<FsVolumeSpi> {
           map.get(bpid).getUsed(), 0L);
     }
   }
-  
+
   static class SimulatedVolume implements FsVolumeSpi {
     private final SimulatedStorage storage;
+    private final FileIoProvider fileIoProvider;
 
-    SimulatedVolume(final SimulatedStorage storage) {
+    SimulatedVolume(final SimulatedStorage storage,
+                    final FileIoProvider fileIoProvider) {
       this.storage = storage;
+      this.fileIoProvider = fileIoProvider;
     }
 
     @Override
@@ -532,6 +536,11 @@ public class SimulatedFSDataset implements 
FsDatasetSpi<FsVolumeSpi> {
     }
 
     @Override
+    public FileIoProvider getFileIoProvider() {
+      return fileIoProvider;
+    }
+
+    @Override
     public VolumeCheckResult check(VolumeCheckContext context)
         throws Exception {
       return VolumeCheckResult.HEALTHY;
@@ -562,10 +571,11 @@ public class SimulatedFSDataset implements 
FsDatasetSpi<FsVolumeSpi> {
     }
 
     registerMBean(datanodeUuid);
+    this.fileIoProvider = new FileIoProvider(conf);
     this.storage = new SimulatedStorage(
         conf.getLong(CONFIG_PROPERTY_CAPACITY, DEFAULT_CAPACITY),
         conf.getEnum(CONFIG_PROPERTY_STATE, DEFAULT_STATE));
-    this.volume = new SimulatedVolume(this.storage);
+    this.volume = new SimulatedVolume(this.storage, this.fileIoProvider);
     this.datasetLock = new AutoCloseableLock();
   }
 

http://git-wip-us.apache.org/repos/asf/hadoop/blob/954dae26/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestBlockRecovery.java
----------------------------------------------------------------------
diff --git 
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestBlockRecovery.java
 
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestBlockRecovery.java
index 6977c57..346250b 100644
--- 
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestBlockRecovery.java
+++ 
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestBlockRecovery.java
@@ -642,7 +642,7 @@ public class TestBlockRecovery {
     ReplicaOutputStreams streams = null;
     try {
       streams = replicaInfo.createStreams(true,
-          DataChecksum.newDataChecksum(DataChecksum.Type.CRC32, 512), 300);
+          DataChecksum.newDataChecksum(DataChecksum.Type.CRC32, 512));
       streams.getChecksumOut().write('a');
       dn.data.initReplicaRecovery(new RecoveringBlock(block, null, 
RECOVERY_ID+1));
       BlockRecoveryWorker.RecoveryTaskContiguous RecoveryTaskContiguous =

http://git-wip-us.apache.org/repos/asf/hadoop/blob/954dae26/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestDirectoryScanner.java
----------------------------------------------------------------------
diff --git 
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestDirectoryScanner.java
 
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestDirectoryScanner.java
index a2b6398..cda6066 100644
--- 
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestDirectoryScanner.java
+++ 
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestDirectoryScanner.java
@@ -887,6 +887,11 @@ public class TestDirectoryScanner {
     }
 
     @Override
+    public FileIoProvider getFileIoProvider() {
+      return null;
+    }
+
+    @Override
     public VolumeCheckResult check(VolumeCheckContext context)
         throws Exception {
       return VolumeCheckResult.HEALTHY;

http://git-wip-us.apache.org/repos/asf/hadoop/blob/954dae26/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestSimulatedFSDataset.java
----------------------------------------------------------------------
diff --git 
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestSimulatedFSDataset.java
 
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestSimulatedFSDataset.java
index 84e9180..dd7d239 100644
--- 
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestSimulatedFSDataset.java
+++ 
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestSimulatedFSDataset.java
@@ -83,7 +83,7 @@ public class TestSimulatedFSDataset {
       ReplicaInPipelineInterface bInfo = fsdataset.createRbw(
           StorageType.DEFAULT, b, false).getReplica();
       ReplicaOutputStreams out = bInfo.createStreams(true,
-          DataChecksum.newDataChecksum(DataChecksum.Type.CRC32, 512), 300);
+          DataChecksum.newDataChecksum(DataChecksum.Type.CRC32, 512));
       try {
         OutputStream dataOut  = out.getDataOut();
         assertEquals(0, fsdataset.getLength(b));

http://git-wip-us.apache.org/repos/asf/hadoop/blob/954dae26/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/extdataset/ExternalDatasetImpl.java
----------------------------------------------------------------------
diff --git 
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/extdataset/ExternalDatasetImpl.java
 
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/extdataset/ExternalDatasetImpl.java
index ab572d0..7548e83 100644
--- 
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/extdataset/ExternalDatasetImpl.java
+++ 
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/extdataset/ExternalDatasetImpl.java
@@ -133,7 +133,7 @@ public class ExternalDatasetImpl implements 
FsDatasetSpi<ExternalVolumeImpl> {
   @Override
   public ReplicaInputStreams getTmpInputStreams(ExtendedBlock b, long blkoff,
       long ckoff) throws IOException {
-    return new ReplicaInputStreams(null, null, null);
+    return new ReplicaInputStreams(null, null, null, null);
   }
 
   @Override

http://git-wip-us.apache.org/repos/asf/hadoop/blob/954dae26/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/extdataset/ExternalReplicaInPipeline.java
----------------------------------------------------------------------
diff --git 
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/extdataset/ExternalReplicaInPipeline.java
 
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/extdataset/ExternalReplicaInPipeline.java
index 3e2fd7d..69ab207 100644
--- 
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/extdataset/ExternalReplicaInPipeline.java
+++ 
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/extdataset/ExternalReplicaInPipeline.java
@@ -57,10 +57,10 @@ public class ExternalReplicaInPipeline implements 
ReplicaInPipelineInterface {
 
   @Override
   public ReplicaOutputStreams createStreams(boolean isCreate,
-      DataChecksum requestedChecksum, long slowLogThresholdMs)
+      DataChecksum requestedChecksum)
       throws IOException {
-    return new ReplicaOutputStreams(null, null, requestedChecksum, false,
-        slowLogThresholdMs);
+    return new ReplicaOutputStreams(null, null, requestedChecksum,
+        null, null);
   }
 
   @Override

http://git-wip-us.apache.org/repos/asf/hadoop/blob/954dae26/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/extdataset/ExternalVolumeImpl.java
----------------------------------------------------------------------
diff --git 
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/extdataset/ExternalVolumeImpl.java
 
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/extdataset/ExternalVolumeImpl.java
index 5c62b5b..ff18e84 100644
--- 
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/extdataset/ExternalVolumeImpl.java
+++ 
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/extdataset/ExternalVolumeImpl.java
@@ -23,6 +23,7 @@ import java.io.IOException;
 import java.nio.channels.ClosedChannelException;
 
 import org.apache.hadoop.fs.StorageType;
+import org.apache.hadoop.hdfs.server.datanode.FileIoProvider;
 import org.apache.hadoop.hdfs.server.datanode.checker.VolumeCheckResult;
 import org.apache.hadoop.hdfs.server.datanode.fsdataset.FsDatasetSpi;
 import org.apache.hadoop.hdfs.server.datanode.fsdataset.FsVolumeReference;
@@ -110,6 +111,11 @@ public class ExternalVolumeImpl implements FsVolumeSpi {
   }
 
   @Override
+  public FileIoProvider getFileIoProvider() {
+    return null;
+  }
+
+  @Override
   public VolumeCheckResult check(VolumeCheckContext context)
       throws Exception {
     return VolumeCheckResult.HEALTHY;

http://git-wip-us.apache.org/repos/asf/hadoop/blob/954dae26/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/TestFsDatasetImpl.java
----------------------------------------------------------------------
diff --git 
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/TestFsDatasetImpl.java
 
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/TestFsDatasetImpl.java
index 1601259..7484a40 100644
--- 
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/TestFsDatasetImpl.java
+++ 
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/TestFsDatasetImpl.java
@@ -44,6 +44,7 @@ import org.apache.hadoop.hdfs.server.datanode.DNConf;
 import org.apache.hadoop.hdfs.server.datanode.DataNode;
 import org.apache.hadoop.hdfs.server.datanode.DataNodeTestUtils;
 import org.apache.hadoop.hdfs.server.datanode.DataStorage;
+import org.apache.hadoop.hdfs.server.datanode.FileIoProvider;
 import org.apache.hadoop.hdfs.server.datanode.FinalizedReplica;
 import org.apache.hadoop.hdfs.server.datanode.ReplicaHandler;
 import org.apache.hadoop.hdfs.server.datanode.ReplicaInfo;
@@ -164,6 +165,8 @@ public class TestFsDatasetImpl {
     this.conf = new Configuration();
     this.conf.setLong(DFS_DATANODE_SCAN_PERIOD_HOURS_KEY, 0);
 
+    final FileIoProvider fileIoProvider = new FileIoProvider(conf);
+    when(datanode.getFileIoProvider()).thenReturn(fileIoProvider);
     when(datanode.getConf()).thenReturn(conf);
     final DNConf dnConf = new DNConf(datanode);
     when(datanode.getDnConf()).thenReturn(dnConf);

http://git-wip-us.apache.org/repos/asf/hadoop/blob/954dae26/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/tools/TestHdfsConfigFields.java
----------------------------------------------------------------------
diff --git 
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/tools/TestHdfsConfigFields.java
 
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/tools/TestHdfsConfigFields.java
index 92019f1..7749c5c 100644
--- 
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/tools/TestHdfsConfigFields.java
+++ 
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/tools/TestHdfsConfigFields.java
@@ -103,6 +103,8 @@ public class TestHdfsConfigFields extends 
TestConfigurationFieldsBase {
         .add(DFSConfigKeys.DFS_DATANODE_STARTUP_KEY);
     configurationPropsToSkipCompare
         .add(DFSConfigKeys.DFS_NAMENODE_STARTUP_KEY);
+    configurationPropsToSkipCompare
+        .add(DFSConfigKeys.DFS_DATANODE_FILE_IO_EVENTS_CLASS_KEY);
 
     // Allocate
     xmlPropsToSkipCompare = new HashSet<String>();


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