Github user sudheeshkatkam commented on a diff in the pull request:
https://github.com/apache/drill/pull/829#discussion_r118037792
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/server/rest/WebUserConnection.java
---
@@ -0,0 +1,190 @@
+/*
+ * 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.drill.exec.server.rest;
+
+import com.google.common.collect.Lists;
+import com.google.common.collect.Maps;
+import com.google.common.collect.Sets;
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.DrillBuf;
+import io.netty.channel.ChannelFuture;
+import io.netty.channel.ChannelPromise;
+import io.netty.channel.DefaultChannelPromise;
+import org.apache.drill.common.exceptions.UserException;
+import org.apache.drill.exec.memory.BufferAllocator;
+import org.apache.drill.exec.physical.impl.materialize.QueryWritableBatch;
+import org.apache.drill.exec.proto.GeneralRPCProtos;
+import org.apache.drill.exec.record.RecordBatchLoader;
+import org.apache.drill.exec.record.VectorWrapper;
+import org.apache.drill.exec.rpc.AbstractUserClientConnectionWrapper;
+import org.apache.drill.exec.rpc.Acks;
+import org.apache.drill.exec.rpc.ChannelClosedException;
+import org.apache.drill.exec.rpc.ConnectionThrottle;
+import org.apache.drill.exec.rpc.RpcOutcomeListener;
+import org.apache.drill.exec.rpc.user.UserSession;
+import org.apache.drill.exec.vector.ValueVector;
+
+import java.net.SocketAddress;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+public class WebUserConnection extends AbstractUserClientConnectionWrapper
implements ConnectionThrottle {
+ private static final org.slf4j.Logger logger =
org.slf4j.LoggerFactory.getLogger(WebUserConnection.class);
+
+ /**
+ * WebUserConnectionWrapper which represents the UserClientConnection
for the WebUser submitting the query. It provides
+ * access to the UserSession executing the query. There is no actual
physical channel corresponding to this connection
+ * wrapper.
+ */
+
+ protected BufferAllocator allocator;
+
+ protected SocketAddress remoteAddress;
+
+ protected UserSession webUserSession;
+
+ protected final ChannelPromise closeFuture;
+
+ public final List<Map<String, String>> results = Lists.newArrayList();
+
+ public final Set<String> columns = Sets.newLinkedHashSet();
+
+ WebUserConnection(BufferAllocator allocator, UserSession webUserSession,
+ SocketAddress remoteAddress, ChannelPromise
closeFuture) {
+ this.allocator = allocator;
+ this.webUserSession = webUserSession;
+ this.remoteAddress = remoteAddress;
+ this.closeFuture = closeFuture;
+ }
+
+ @Override
+ public UserSession getSession() {
+ return webUserSession;
+ }
+
+ @Override
+ public void sendData(RpcOutcomeListener<GeneralRPCProtos.Ack> listener,
QueryWritableBatch result) {
+
+ // Check if there is any data or not. There can be overflow here but
DrillBuf doesn't support allocating with
+ // bytes in long. Hence we are just preserving the earlier behavior
and logging debug log for the case.
+ final int dataByteCount = (int) result.getByteCount();
+
+ if (dataByteCount <= 0) {
+ if (logger.isDebugEnabled()) {
+ logger.debug("Either no data received for this query or there is
BufferOverflow in dataByteCount: {}",
+ dataByteCount);
+ }
+ latch.countDown();
+ listener.success(Acks.OK, null);
+ return;
+ }
+
+ // If here that means there is some data for sure. Create a ByteBuf
with all the data in it.
+ final int rows = result.getHeader().getRowCount();
+ final DrillBuf bufferWithData = allocator.buffer(dataByteCount);
+ try {
+ final ByteBuf[] resultDataBuffers = result.getBuffers();
+
+ for (final ByteBuf buffer : resultDataBuffers) {
+ bufferWithData.writeBytes(buffer);
+ buffer.release();
+ }
+
+ final RecordBatchLoader loader = new RecordBatchLoader(allocator);
+ try {
+ loader.load(result.getHeader().getDef(), bufferWithData);
+ // TODO: Clean: DRILL-2933: That load(...) no longer throws
+ // SchemaChangeException, so check/clean catch clause below.
+ for (int i = 0; i < loader.getSchema().getFieldCount(); ++i) {
+ columns.add(loader.getSchema().getColumn(i).getPath());
+ }
+ for (int i = 0; i < rows; ++i) {
+ final Map<String, String> record = Maps.newHashMap();
+ for (VectorWrapper<?> vw : loader) {
+ final String field =
vw.getValueVector().getMetadata().getNamePart().getName();
+ final ValueVector.Accessor accessor =
vw.getValueVector().getAccessor();
+ final Object value = i < accessor.getValueCount() ?
accessor.getObject(i) : null;
+ final String display = value == null ? null : value.toString();
+ record.put(field, display);
+ }
+ results.add(record);
+ }
+ } finally {
+ loader.clear();
+ }
+ } catch (Exception e) { // not catching OOM here
+ exception = UserException.systemError(e).build(logger);
+ latch.countDown();
+ } finally {
+ bufferWithData.release();
+ }
+
+ // Notify the listener with ACK.OK because data is send successfully
from Drillbit even though there is error found
+ // during processing.
+ listener.success(Acks.OK, null);
+ }
+
+ @Override
+ public ChannelFuture getChannelClosureFuture() {
+ return closeFuture;
+ }
+
+ @Override
+ public SocketAddress getRemoteAddress() {
+ return remoteAddress;
+ }
+
+ @Override
+ public void setAutoRead(boolean enableAutoRead) {
+ // no-op
+ }
+
+ /**
+ * For anonymous WebUserSession it is called after each query request
whereas for Authenticated WebUserSession
+ * it is never called.
--- End diff --
Comment does not seem right. Looks to me that `cleanupSession()` is called
after every query request, and the session resources are closed iff the user is
anonymous.
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