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HBASE-15264 Implement a fan out HDFS OutputStream

This commit is contained in:
zhangduo 2016-02-24 20:47:38 +08:00
parent a3b4575f70
commit 6e9d355b12
4 changed files with 1456 additions and 0 deletions
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533
hbase-server/src/main/java/org/apache/hadoop/hbase/util/FanOutOneBlockAsyncDFSOutput.java Normal file
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/**
* 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.hadoop.hbase.util;
import static org.apache.hadoop.hbase.util.FanOutOneBlockAsyncDFSOutputHelper.HEART_BEAT_SEQNO;
import static org.apache.hadoop.hbase.util.FanOutOneBlockAsyncDFSOutputHelper.completeFile;
import static org.apache.hadoop.hbase.util.FanOutOneBlockAsyncDFSOutputHelper.endFileLease;
import static org.apache.hadoop.hbase.util.FanOutOneBlockAsyncDFSOutputHelper.getStatus;
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_CLIENT_SOCKET_TIMEOUT_KEY;
import java.io.Closeable;
import java.io.IOException;
import java.nio.channels.CompletionHandler;
import java.util.ArrayDeque;
import java.util.Collection;
import java.util.Collections;
import java.util.Deque;
import java.util.IdentityHashMap;
import java.util.List;
import java.util.Set;
import java.util.concurrent.Callable;
import java.util.concurrent.TimeUnit;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.hbase.util.FanOutOneBlockAsyncDFSOutputHelper.CancelOnClose;
import org.apache.hadoop.hdfs.DFSClient;
import org.apache.hadoop.hdfs.DistributedFileSystem;
import org.apache.hadoop.hdfs.protocol.ClientProtocol;
import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
import org.apache.hadoop.hdfs.protocol.LocatedBlock;
import org.apache.hadoop.hdfs.protocol.datatransfer.PacketHeader;
import org.apache.hadoop.hdfs.protocol.datatransfer.PipelineAck;
import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.PipelineAckProto;
import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.Status;
import org.apache.hadoop.hdfs.server.common.HdfsServerConstants;
import org.apache.hadoop.util.DataChecksum;
import com.google.common.base.Supplier;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufAllocator;
import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.EventLoop;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.protobuf.ProtobufDecoder;
import io.netty.handler.codec.protobuf.ProtobufVarint32FrameDecoder;
import io.netty.handler.timeout.IdleState;
import io.netty.handler.timeout.IdleStateEvent;
import io.netty.handler.timeout.IdleStateHandler;
import io.netty.util.concurrent.Future;
import io.netty.util.concurrent.FutureListener;
import io.netty.util.concurrent.Promise;
/**
* An asynchronous HDFS output stream implementation which fans out data to datanode and only
* supports writing file with only one block.
* <p>
* Use the createOutput method in {@link FanOutOneBlockAsyncDFSOutputHelper} to create. The mainly
* usage of this class is implementing WAL, so we only expose a little HDFS configurations in the
* method. And we place it here under util package because we want to make it independent of WAL
* implementation thus easier to move it to HDFS project finally.
* <p>
* Note that, all connections to datanode will run in the same {@link EventLoop} which means we only
* need one thread here. But be careful, we do some blocking operations in {@link #close()} and
* {@link #recoverAndClose(CancelableProgressable)} methods, so do not call them inside
* {@link EventLoop}. And for {@link #write(byte[])} {@link #write(byte[], int, int)},
* {@link #buffered()} and {@link #flush(Object, CompletionHandler, boolean)}, if you call them
* outside {@link EventLoop}, there will be an extra context-switch.
* <p>
* Advantages compare to DFSOutputStream:
* <ol>
* <li>The fan out mechanism. This will reduce the latency.</li>
* <li>The asynchronous WAL could also run in the same EventLoop, we could just call write and flush
* inside the EventLoop thread, so generally we only have one thread to do all the things.</li>
* <li>Fail-fast when connection to datanode error. The WAL implementation could open new writer
* ASAP.</li>
* <li>We could benefit from netty's ByteBuf management mechanism.</li>
* </ol>
*/
@InterfaceAudience.Private
public class FanOutOneBlockAsyncDFSOutput implements Closeable {
private final Configuration conf;
private final FSUtils fsUtils;
private final DistributedFileSystem dfs;
private final DFSClient client;
private final ClientProtocol namenode;
private final String clientName;
private final String src;
private final long fileId;
private final LocatedBlock locatedBlock;
private final EventLoop eventLoop;
private final List<Channel> datanodeList;
private final DataChecksum summer;
private final ByteBufAllocator alloc;
private static final class Callback {
public final Promise<Void> promise;
public final long ackedLength;
public final Set<Channel> unfinishedReplicas;
public Callback(Promise<Void> promise, long ackedLength, Collection<Channel> replicas) {
this.promise = promise;
this.ackedLength = ackedLength;
if (replicas.isEmpty()) {
this.unfinishedReplicas = Collections.emptySet();
} else {
this.unfinishedReplicas = Collections
.newSetFromMap(new IdentityHashMap<Channel, Boolean>(replicas.size()));
this.unfinishedReplicas.addAll(replicas);
}
}
}
private final Deque<Callback> waitingAckQueue = new ArrayDeque<>();
// this could be different from acked block length because a packet can not start at the middle of
// a chunk.
private long nextPacketOffsetInBlock = 0L;
private long nextPacketSeqno = 0L;
private ByteBuf buf;
private enum State {
STREAMING, CLOSING, BROKEN, CLOSED
}
private State state;
private void completed(Channel channel) {
if (waitingAckQueue.isEmpty()) {
return;
}
for (Callback c : waitingAckQueue) {
if (c.unfinishedReplicas.remove(channel)) {
if (c.unfinishedReplicas.isEmpty()) {
c.promise.trySuccess(null);
// since we will remove the Callback entry from waitingAckQueue if its unfinishedReplicas
// is empty, so this could only happen at the head of waitingAckQueue, so we just call
// removeFirst here.
waitingAckQueue.removeFirst();
// also wake up flush requests which have the same length.
for (Callback cb; (cb = waitingAckQueue.peekFirst()) != null;) {
if (cb.ackedLength == c.ackedLength) {
cb.promise.trySuccess(null);
waitingAckQueue.removeFirst();
} else {
break;
}
}
}
return;
}
}
}
private void failed(Channel channel, Supplier<Throwable> errorSupplier) {
if (state == State.BROKEN || state == State.CLOSED) {
return;
}
if (state == State.CLOSING) {
Callback c = waitingAckQueue.peekFirst();
if (c == null || !c.unfinishedReplicas.contains(channel)) {
// nothing, the endBlock request has already finished.
return;
}
}
// disable further write, and fail all pending ack.
state = State.BROKEN;
Throwable error = errorSupplier.get();
for (Callback c : waitingAckQueue) {
c.promise.tryFailure(error);
}
waitingAckQueue.clear();
for (Channel ch : datanodeList) {
ch.close();
}
}
private void setupReceiver(final int timeoutMs) {
SimpleChannelInboundHandler<PipelineAckProto> ackHandler = new SimpleChannelInboundHandler<PipelineAckProto>() {
@Override
public boolean isSharable() {
return true;
}
@Override
protected void channelRead0(final ChannelHandlerContext ctx, PipelineAckProto ack)
throws Exception {
final Status reply = getStatus(ack);
if (reply != Status.SUCCESS) {
failed(ctx.channel(), new Supplier<Throwable>() {
@Override
public Throwable get() {
return new IOException("Bad response " + reply + " for block "
+ locatedBlock.getBlock() + " from datanode " + ctx.channel().remoteAddress());
}
});
return;
}
if (PipelineAck.isRestartOOBStatus(reply)) {
failed(ctx.channel(), new Supplier<Throwable>() {
@Override
public Throwable get() {
return new IOException("Restart response " + reply + " for block "
+ locatedBlock.getBlock() + " from datanode " + ctx.channel().remoteAddress());
}
});
return;
}
if (ack.getSeqno() == HEART_BEAT_SEQNO) {
return;
}
completed(ctx.channel());
}
@Override
public void channelInactive(final ChannelHandlerContext ctx) throws Exception {
failed(ctx.channel(), new Supplier<Throwable>() {
@Override
public Throwable get() {
return new IOException("Connection to " + ctx.channel().remoteAddress() + " closed");
}
});
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, final Throwable cause)
throws Exception {
failed(ctx.channel(), new Supplier<Throwable>() {
@Override
public Throwable get() {
return cause;
}
});
}
@Override
public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
if (evt instanceof IdleStateEvent) {
IdleStateEvent e = (IdleStateEvent) evt;
if (e.state() == IdleState.READER_IDLE) {
failed(ctx.channel(), new Supplier<Throwable>() {
@Override
public Throwable get() {
return new IOException("Timeout(" + timeoutMs + "ms) waiting for response");
}
});
} else if (e.state() == IdleState.WRITER_IDLE) {
PacketHeader heartbeat = new PacketHeader(4, 0, HEART_BEAT_SEQNO, false, 0, false);
int len = heartbeat.getSerializedSize();
ByteBuf buf = alloc.buffer(len);
heartbeat.putInBuffer(buf.nioBuffer(0, len));
buf.writerIndex(len);
ctx.channel().writeAndFlush(buf);
}
return;
}
super.userEventTriggered(ctx, evt);
}
};
for (Channel ch : datanodeList) {
ch.pipeline().addLast(
new IdleStateHandler(timeoutMs, timeoutMs / 2, 0, TimeUnit.MILLISECONDS),
new ProtobufVarint32FrameDecoder(),
new ProtobufDecoder(PipelineAckProto.getDefaultInstance()), ackHandler);
ch.config().setAutoRead(true);
}
}
FanOutOneBlockAsyncDFSOutput(Configuration conf, FSUtils fsUtils, DistributedFileSystem dfs,
DFSClient client, ClientProtocol namenode, String clientName, String src, long fileId,
LocatedBlock locatedBlock, EventLoop eventLoop, List<Channel> datanodeList,
DataChecksum summer, ByteBufAllocator alloc) {
this.conf = conf;
this.fsUtils = fsUtils;
this.dfs = dfs;
this.client = client;
this.namenode = namenode;
this.fileId = fileId;
this.clientName = clientName;
this.src = src;
this.locatedBlock = locatedBlock;
this.eventLoop = eventLoop;
this.datanodeList = datanodeList;
this.summer = summer;
this.alloc = alloc;
this.buf = alloc.directBuffer();
this.state = State.STREAMING;
setupReceiver(conf.getInt(DFS_CLIENT_SOCKET_TIMEOUT_KEY, HdfsServerConstants.READ_TIMEOUT));
}
/**
* Just call write(b, 0, b.length).
* @see #write(byte[], int, int)
*/
public void write(byte[] b) {
write(b, 0, b.length);
}
/**
* Copy the data into the buffer. Note that you need to call
* {@link #flush(Object, CompletionHandler, boolean)} to flush the buffer manually.
*/
public void write(final byte[] b, final int off, final int len) {
if (eventLoop.inEventLoop()) {
buf.ensureWritable(len).writeBytes(b, off, len);
} else {
eventLoop.submit(new Runnable() {
@Override
public void run() {
buf.ensureWritable(len).writeBytes(b, off, len);
}
}).syncUninterruptibly();
}
}
/**
* Return the current size of buffered data.
*/
public int buffered() {
if (eventLoop.inEventLoop()) {
return buf.readableBytes();
} else {
return eventLoop.submit(new Callable<Integer>() {
@Override
public Integer call() throws Exception {
return buf.readableBytes();
}
}).syncUninterruptibly().getNow().intValue();
}
}
public DatanodeInfo[] getPipeline() {
return locatedBlock.getLocations();
}
private <A> void flush0(final A attachment, final CompletionHandler<Long, ? super A> handler,
boolean syncBlock) {
if (state != State.STREAMING) {
handler.failed(new IOException("stream already broken"), attachment);
return;
}
int dataLen = buf.readableBytes();
final long ackedLength = nextPacketOffsetInBlock + dataLen;
if (ackedLength == locatedBlock.getBlock().getNumBytes()) {
// no new data, just return
handler.completed(locatedBlock.getBlock().getNumBytes(), attachment);
return;
}
Promise<Void> promise = eventLoop.newPromise();
promise.addListener(new FutureListener<Void>() {
@Override
public void operationComplete(Future<Void> future) throws Exception {
if (future.isSuccess()) {
locatedBlock.getBlock().setNumBytes(ackedLength);
handler.completed(ackedLength, attachment);
} else {
handler.failed(future.cause(), attachment);
}
}
});
Callback c = waitingAckQueue.peekLast();
if (c != null && ackedLength == c.ackedLength) {
// just append it to the tail of waiting ack queue,, do not issue new hflush request.
waitingAckQueue
.addLast(new Callback(promise, ackedLength, Collections.<Channel> emptyList()));
return;
}
int chunkLen = summer.getBytesPerChecksum();
int trailingPartialChunkLen = dataLen % chunkLen;
int numChecks = dataLen / chunkLen + (trailingPartialChunkLen != 0 ? 1 : 0);
int checksumLen = numChecks * summer.getChecksumSize();
ByteBuf checksumBuf = alloc.directBuffer(checksumLen);
summer.calculateChunkedSums(buf.nioBuffer(), checksumBuf.nioBuffer(0, checksumLen));
checksumBuf.writerIndex(checksumLen);
PacketHeader header = new PacketHeader(4 + checksumLen + dataLen, nextPacketOffsetInBlock,
nextPacketSeqno, false, dataLen, syncBlock);
int headerLen = header.getSerializedSize();
ByteBuf headerBuf = alloc.buffer(headerLen);
header.putInBuffer(headerBuf.nioBuffer(0, headerLen));
headerBuf.writerIndex(headerLen);
waitingAckQueue.addLast(new Callback(promise, ackedLength, datanodeList));
for (Channel ch : datanodeList) {
ch.write(headerBuf.duplicate().retain());
ch.write(checksumBuf.duplicate().retain());
ch.writeAndFlush(buf.duplicate().retain());
}
checksumBuf.release();
headerBuf.release();
ByteBuf newBuf = alloc.directBuffer().ensureWritable(trailingPartialChunkLen);
if (trailingPartialChunkLen != 0) {
buf.readerIndex(dataLen - trailingPartialChunkLen).readBytes(newBuf, trailingPartialChunkLen);
}
buf.release();
this.buf = newBuf;
nextPacketOffsetInBlock += dataLen - trailingPartialChunkLen;
nextPacketSeqno++;
}
/**
* Flush the buffer out to datanodes.
* @param attachment will be passed to handler when completed.
* @param handler will set the acked length as result when completed.
* @param syncBlock will call hsync if true, otherwise hflush.
*/
public <A> void flush(final A attachment, final CompletionHandler<Long, ? super A> handler,
final boolean syncBlock) {
if (eventLoop.inEventLoop()) {
flush0(attachment, handler, syncBlock);
} else {
eventLoop.execute(new Runnable() {
@Override
public void run() {
flush0(attachment, handler, syncBlock);
}
});
}
}
private void endBlock(Promise<Void> promise, long size) {
if (state != State.STREAMING) {
promise.tryFailure(new IOException("stream already broken"));
return;
}
if (!waitingAckQueue.isEmpty()) {
promise.tryFailure(new IllegalStateException("should call flush first before calling close"));
return;
}
state = State.CLOSING;
PacketHeader header = new PacketHeader(4, size, nextPacketSeqno, true, 0, false);
buf.release();
buf = null;
int headerLen = header.getSerializedSize();
ByteBuf headerBuf = alloc.buffer(headerLen);
header.putInBuffer(headerBuf.nioBuffer(0, headerLen));
headerBuf.writerIndex(headerLen);
waitingAckQueue.add(new Callback(promise, size, datanodeList));
for (Channel ch : datanodeList) {
ch.writeAndFlush(headerBuf.duplicate().retain());
}
headerBuf.release();
}
/**
* The close method when error occurred. Now we just call recoverFileLease.
*/
public void recoverAndClose(CancelableProgressable reporter) throws IOException {
assert !eventLoop.inEventLoop();
for (Channel ch : datanodeList) {
ch.closeFuture().awaitUninterruptibly();
}
endFileLease(client, src, fileId);
fsUtils.recoverFileLease(dfs, new Path(src), conf,
reporter == null ? new CancelOnClose(client) : reporter);
}
/**
* End the current block and complete file at namenode. You should call
* {@link #recoverAndClose(CancelableProgressable)} if this method throws an exception.
*/
@Override
public void close() throws IOException {
assert !eventLoop.inEventLoop();
final Promise<Void> promise = eventLoop.newPromise();
eventLoop.execute(new Runnable() {
@Override
public void run() {
endBlock(promise, nextPacketOffsetInBlock + buf.readableBytes());
}
});
promise.addListener(new FutureListener<Void>() {
@Override
public void operationComplete(Future<Void> future) throws Exception {
for (Channel ch : datanodeList) {
ch.close();
}
}
}).syncUninterruptibly();
for (Channel ch : datanodeList) {
ch.closeFuture().awaitUninterruptibly();
}
completeFile(client, namenode, src, clientName, locatedBlock.getBlock(), fileId);
}
}

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hbase-server/src/main/java/org/apache/hadoop/hbase/util/FanOutOneBlockAsyncDFSOutputHelper.java Normal file
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/**
* 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.hadoop.hbase.util;
import static io.netty.channel.ChannelOption.CONNECT_TIMEOUT_MILLIS;
import static org.apache.hadoop.fs.CreateFlag.CREATE;
import static org.apache.hadoop.fs.CreateFlag.OVERWRITE;
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_CLIENT_SOCKET_TIMEOUT_KEY;
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_CLIENT_USE_DN_HOSTNAME;
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_CLIENT_USE_DN_HOSTNAME_DEFAULT;
import static org.apache.hadoop.hdfs.protocol.datatransfer.BlockConstructionStage.PIPELINE_SETUP_CREATE;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.EnumSet;
import java.util.List;
import java.util.concurrent.TimeUnit;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.CreateFlag;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.FileSystemLinkResolver;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.UnresolvedLinkException;
import org.apache.hadoop.fs.permission.FsPermission;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.hbase.client.ConnectionUtils;
import org.apache.hadoop.hdfs.DFSClient;
import org.apache.hadoop.hdfs.DFSOutputStream;
import org.apache.hadoop.hdfs.DistributedFileSystem;
import org.apache.hadoop.hdfs.protocol.ClientProtocol;
import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
import org.apache.hadoop.hdfs.protocol.HdfsFileStatus;
import org.apache.hadoop.hdfs.protocol.LocatedBlock;
import org.apache.hadoop.hdfs.protocol.datatransfer.BlockConstructionStage;
import org.apache.hadoop.hdfs.protocol.datatransfer.DataTransferProtoUtil;
import org.apache.hadoop.hdfs.protocol.datatransfer.DataTransferProtocol;
import org.apache.hadoop.hdfs.protocol.datatransfer.Op;
import org.apache.hadoop.hdfs.protocol.datatransfer.PipelineAck;
import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.BaseHeaderProto;
import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.BlockOpResponseProto;
import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.CachingStrategyProto;
import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.ChecksumProto;
import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.ClientOperationHeaderProto;
import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.OpWriteBlockProto;
import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.OpWriteBlockProto.Builder;
import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.PipelineAckProto;
import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.Status;
import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.StorageTypeProto;
import org.apache.hadoop.hdfs.protocolPB.PBHelper;
import org.apache.hadoop.hdfs.security.token.block.InvalidBlockTokenException;
import org.apache.hadoop.hdfs.server.common.HdfsServerConstants;
import org.apache.hadoop.hdfs.server.namenode.LeaseExpiredException;
import org.apache.hadoop.io.EnumSetWritable;
import org.apache.hadoop.net.NetUtils;
import org.apache.hadoop.util.DataChecksum;
import com.google.common.base.Throwables;
import com.google.common.collect.ImmutableMap;
import com.google.protobuf.CodedOutputStream;
import io.netty.bootstrap.Bootstrap;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufAllocator;
import io.netty.buffer.ByteBufOutputStream;
import io.netty.buffer.PooledByteBufAllocator;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.EventLoop;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.protobuf.ProtobufDecoder;
import io.netty.handler.codec.protobuf.ProtobufVarint32FrameDecoder;
import io.netty.handler.timeout.IdleState;
import io.netty.handler.timeout.IdleStateEvent;
import io.netty.handler.timeout.IdleStateHandler;
import io.netty.util.concurrent.Future;
import io.netty.util.concurrent.Promise;
/**
* Helper class for implementing {@link FanOutOneBlockAsyncDFSOutput}.
*/
@InterfaceAudience.Private
public class FanOutOneBlockAsyncDFSOutputHelper {
private static final Log LOG = LogFactory.getLog(FanOutOneBlockAsyncDFSOutputHelper.class);
private FanOutOneBlockAsyncDFSOutputHelper() {
}
// use pooled allocator for performance.
private static final ByteBufAllocator ALLOC = PooledByteBufAllocator.DEFAULT;
// copied from DFSPacket since it is package private.
public static final long HEART_BEAT_SEQNO = -1L;
// helper class for creating DataChecksum object.
private static final Method CREATE_CHECKSUM;
// helper class for getting Status from PipelineAckProto. In hadoop 2.6 or before, there is a
// getStatus method, and for hadoop 2.7 or after, the status is retrieved from flag. The flag may
// get from proto directly, or combined by the reply field of the proto and a ECN object. See
// createPipelineAckStatusGetter for more details.
private interface PipelineAckStatusGetter {
Status get(PipelineAckProto ack);
}
private static final PipelineAckStatusGetter PIPELINE_ACK_STATUS_GETTER;
// StorageType enum is added in hadoop 2.4, but it is moved to another package in hadoop 2.6 and
// the setter method in OpWriteBlockProto is also added in hadoop 2.6. So we need to skip the
// setStorageType call if it is hadoop 2.5 or before. See createStorageTypeSetter for more
// details.
private interface StorageTypeSetter {
OpWriteBlockProto.Builder set(OpWriteBlockProto.Builder builder, Enum<?> storageType);
}
private static final StorageTypeSetter STORAGE_TYPE_SETTER;
// helper class for calling create method on namenode. There is a supportedVersions parameter for
// hadoop 2.6 or after. See createFileCreater for more details.
private interface FileCreater {
HdfsFileStatus create(ClientProtocol namenode, String src, FsPermission masked,
String clientName, EnumSetWritable<CreateFlag> flag, boolean createParent,
short replication, long blockSize) throws IOException;
}
private static final FileCreater FILE_CREATER;
// helper class for add or remove lease from DFSClient. Hadoop 2.4 use src as the Map's key, and
// hadoop 2.5 or after use inodeId. See createLeaseManager for more details.
private interface LeaseManager {
void begin(DFSClient client, String src, long inodeId);
void end(DFSClient client, String src, long inodeId);
}
private static final LeaseManager LEASE_MANAGER;
// This is used to terminate a recoverFileLease call when FileSystem is already closed.
// isClientRunning is not public so we need to use reflection.
private interface DFSClientAdaptor {
boolean isClientRunning(DFSClient client);
}
private static final DFSClientAdaptor DFS_CLIENT_ADAPTOR;
private static DFSClientAdaptor createDFSClientAdaptor() {
try {
final Method method = DFSClient.class.getDeclaredMethod("isClientRunning");
method.setAccessible(true);
return new DFSClientAdaptor() {
@Override
public boolean isClientRunning(DFSClient client) {
try {
return (Boolean) method.invoke(client);
} catch (IllegalAccessException | InvocationTargetException e) {
throw new RuntimeException(e);
}
}
};
} catch (NoSuchMethodException e) {
throw new Error(e);
}
}
private static LeaseManager createLeaseManager() {
try {
final Method beginFileLeaseMethod = DFSClient.class.getDeclaredMethod("beginFileLease",
long.class, DFSOutputStream.class);
beginFileLeaseMethod.setAccessible(true);
final Method endFileLeaseMethod = DFSClient.class.getDeclaredMethod("endFileLease",
long.class);
endFileLeaseMethod.setAccessible(true);
return new LeaseManager() {
@Override
public void begin(DFSClient client, String src, long inodeId) {
try {
beginFileLeaseMethod.invoke(client, inodeId, null);
} catch (IllegalAccessException | InvocationTargetException e) {
throw new RuntimeException(e);
}
}
@Override
public void end(DFSClient client, String src, long inodeId) {
try {
endFileLeaseMethod.invoke(client, inodeId);
} catch (IllegalAccessException | InvocationTargetException e) {
throw new RuntimeException(e);
}
}
};
} catch (NoSuchMethodException e) {
LOG.warn("No inodeId related lease methods found, should be hadoop 2.4-", e);
}
try {
final Method beginFileLeaseMethod = DFSClient.class.getDeclaredMethod("beginFileLease",
String.class, DFSOutputStream.class);
beginFileLeaseMethod.setAccessible(true);
final Method endFileLeaseMethod = DFSClient.class.getDeclaredMethod("endFileLease",
String.class);
endFileLeaseMethod.setAccessible(true);
return new LeaseManager() {
@Override
public void begin(DFSClient client, String src, long inodeId) {
try {
beginFileLeaseMethod.invoke(client, src, null);
} catch (IllegalAccessException | InvocationTargetException e) {
throw new RuntimeException(e);
}
}
@Override
public void end(DFSClient client, String src, long inodeId) {
try {
endFileLeaseMethod.invoke(client, src);
} catch (IllegalAccessException | InvocationTargetException e) {
throw new RuntimeException(e);
}
}
};
} catch (NoSuchMethodException e) {
throw new Error(e);
}
}
private static PipelineAckStatusGetter createPipelineAckStatusGetter() {
try {
final Method getFlagListMethod = PipelineAckProto.class.getMethod("getFlagList");
@SuppressWarnings("rawtypes")
Class<? extends Enum> ecnClass;
try {
ecnClass = Class.forName("org.apache.hadoop.hdfs.protocol.datatransfer.PipelineAck$ECN")
.asSubclass(Enum.class);
} catch (ClassNotFoundException e) {
throw new Error(e);
}
@SuppressWarnings("unchecked")
final Enum<?> disabledECN = Enum.valueOf(ecnClass, "DISABLED");
final Method getReplyMethod = PipelineAckProto.class.getMethod("getReply", int.class);
final Method combineHeaderMethod = PipelineAck.class.getMethod("combineHeader", ecnClass,
Status.class);
final Method getStatusFromHeaderMethod = PipelineAck.class.getMethod("getStatusFromHeader",
int.class);
return new PipelineAckStatusGetter() {
@Override
public Status get(PipelineAckProto ack) {
try {
@SuppressWarnings("unchecked")
List<Integer> flagList = (List<Integer>) getFlagListMethod.invoke(ack);
Integer headerFlag;
if (flagList.isEmpty()) {
Status reply = (Status) getReplyMethod.invoke(ack, 0);
headerFlag = (Integer) combineHeaderMethod.invoke(null, disabledECN, reply);
} else {
headerFlag = flagList.get(0);
}
return (Status) getStatusFromHeaderMethod.invoke(null, headerFlag);
} catch (IllegalAccessException | InvocationTargetException e) {
throw new RuntimeException(e);
}
}
};
} catch (NoSuchMethodException e) {
LOG.warn("Can not get expected methods, should be hadoop 2.6-", e);
}
try {
final Method getStatusMethod = PipelineAckProto.class.getMethod("getStatus", int.class);
return new PipelineAckStatusGetter() {
@Override
public Status get(PipelineAckProto ack) {
try {
return (Status) getStatusMethod.invoke(ack, 0);
} catch (IllegalAccessException | InvocationTargetException e) {
throw new RuntimeException(e);
}
}
};
} catch (NoSuchMethodException e) {
throw new Error(e);
}
}
private static StorageTypeSetter createStorageTypeSetter() {
final Method setStorageTypeMethod;
try {
setStorageTypeMethod = OpWriteBlockProto.Builder.class.getMethod("setStorageType",
StorageTypeProto.class);
} catch (NoSuchMethodException e) {
LOG.warn("noSetStorageType method found, should be hadoop 2.5-", e);
return new StorageTypeSetter() {
@Override
public Builder set(Builder builder, Enum<?> storageType) {
return builder;
}
};
}
ImmutableMap.Builder<String, StorageTypeProto> builder = ImmutableMap.builder();
for (StorageTypeProto storageTypeProto : StorageTypeProto.values()) {
builder.put(storageTypeProto.name(), storageTypeProto);
}
final ImmutableMap<String, StorageTypeProto> name2ProtoEnum = builder.build();
return new StorageTypeSetter() {
@Override
public Builder set(Builder builder, Enum<?> storageType) {
Object protoEnum = name2ProtoEnum.get(storageType.name());
try {
setStorageTypeMethod.invoke(builder, protoEnum);
} catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
throw new RuntimeException(e);
}
return builder;
}
};
}
private static FileCreater createFileCreater() {
for (Method method : ClientProtocol.class.getMethods()) {
if (method.getName().equals("create")) {
final Method createMethod = method;
Class<?>[] paramTypes = createMethod.getParameterTypes();
if (paramTypes[paramTypes.length - 1] == long.class) {
return new FileCreater() {
@Override
public HdfsFileStatus create(ClientProtocol namenode, String src, FsPermission masked,
String clientName, EnumSetWritable<CreateFlag> flag, boolean createParent,
short replication, long blockSize) throws IOException {
try {
return (HdfsFileStatus) createMethod.invoke(namenode, src, masked, clientName, flag,
createParent, replication, blockSize);
} catch (IllegalAccessException e) {
throw new RuntimeException(e);
} catch (InvocationTargetException e) {
Throwables.propagateIfPossible(e.getTargetException(), IOException.class);
throw new RuntimeException(e);
}
}
};
} else {
try {
Class<?> cryptoProtocolVersionClass = Class
.forName("org.apache.hadoop.crypto.CryptoProtocolVersion");
Method supportedMethod = cryptoProtocolVersionClass.getMethod("supported");
final Object supported = supportedMethod.invoke(null);
return new FileCreater() {
@Override
public HdfsFileStatus create(ClientProtocol namenode, String src, FsPermission masked,
String clientName, EnumSetWritable<CreateFlag> flag, boolean createParent,
short replication, long blockSize) throws IOException {
try {
return (HdfsFileStatus) createMethod.invoke(namenode, src, masked, clientName,
flag, createParent, replication, blockSize, supported);
} catch (IllegalAccessException e) {
throw new RuntimeException(e);
} catch (InvocationTargetException e) {
Throwables.propagateIfPossible(e.getTargetException(), IOException.class);
throw new RuntimeException(e);
}
}
};
} catch (ClassNotFoundException | NoSuchMethodException | IllegalAccessException
| InvocationTargetException e) {
throw new Error(e);
}
}
}
}
throw new Error("No create method found for " + ClientProtocol.class.getName());
}
// cancel the processing if DFSClient is already closed.
static final class CancelOnClose implements CancelableProgressable {
private final DFSClient client;
public CancelOnClose(DFSClient client) {
this.client = client;
}
@Override
public boolean progress() {
return DFS_CLIENT_ADAPTOR.isClientRunning(client);
}
}
static {
try {
CREATE_CHECKSUM = DFSClient.Conf.class.getDeclaredMethod("createChecksum");
CREATE_CHECKSUM.setAccessible(true);
} catch (NoSuchMethodException e) {
throw new Error(e);
}
PIPELINE_ACK_STATUS_GETTER = createPipelineAckStatusGetter();
STORAGE_TYPE_SETTER = createStorageTypeSetter();
FILE_CREATER = createFileCreater();
LEASE_MANAGER = createLeaseManager();
DFS_CLIENT_ADAPTOR = createDFSClientAdaptor();
}
static void beginFileLease(DFSClient client, String src, long inodeId) {
LEASE_MANAGER.begin(client, src, inodeId);
}
static void endFileLease(DFSClient client, String src, long inodeId) {
LEASE_MANAGER.end(client, src, inodeId);
}
static DataChecksum createChecksum(DFSClient client) {
try {
return (DataChecksum) CREATE_CHECKSUM.invoke(client.getConf());
} catch (IllegalAccessException | InvocationTargetException e) {
throw new RuntimeException(e);
}
}
static Status getStatus(PipelineAckProto ack) {
return PIPELINE_ACK_STATUS_GETTER.get(ack);
}
private static void processWriteBlockResponse(Channel channel, final DatanodeInfo dnInfo,
final Promise<Channel> promise, final int timeoutMs) {
channel.pipeline().addLast(new IdleStateHandler(timeoutMs, 0, 0, TimeUnit.MILLISECONDS),
new ProtobufVarint32FrameDecoder(),
new ProtobufDecoder(BlockOpResponseProto.getDefaultInstance()),
new SimpleChannelInboundHandler<BlockOpResponseProto>() {
@Override
protected void channelRead0(ChannelHandlerContext ctx, BlockOpResponseProto resp)
throws Exception {
Status pipelineStatus = resp.getStatus();
if (PipelineAck.isRestartOOBStatus(pipelineStatus)) {
throw new IOException("datanode " + dnInfo + " is restarting");
}
String logInfo = "ack with firstBadLink as " + resp.getFirstBadLink();
if (resp.getStatus() != Status.SUCCESS) {
if (resp.getStatus() == Status.ERROR_ACCESS_TOKEN) {
throw new InvalidBlockTokenException("Got access token error" + ", status message "
+ resp.getMessage() + ", " + logInfo);
} else {
throw new IOException("Got error" + ", status=" + resp.getStatus().name()
+ ", status message " + resp.getMessage() + ", " + logInfo);
}
}
// success
ChannelPipeline p = ctx.pipeline();
while (p.first() != null) {
p.removeFirst();
}
// Disable auto read here. Enable it after we setup the streaming pipeline in
// FanOutOneBLockAsyncDFSOutput.
ctx.channel().config().setAutoRead(false);
promise.trySuccess(ctx.channel());
}
@Override
public void channelInactive(ChannelHandlerContext ctx) throws Exception {
promise.tryFailure(new IOException("connection to " + dnInfo + " is closed"));
}
@Override
public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
if (evt instanceof IdleStateEvent
&& ((IdleStateEvent) evt).state() == IdleState.READER_IDLE) {
promise
.tryFailure(new IOException("Timeout(" + timeoutMs + "ms) waiting for response"));
} else {
super.userEventTriggered(ctx, evt);
}
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
promise.tryFailure(cause);
}
});
}
private static void requestWriteBlock(Channel channel, Enum<?> storageType,
OpWriteBlockProto.Builder writeBlockProtoBuilder) throws IOException {
// TODO: SASL negotiation. should be done using a netty Handler.
OpWriteBlockProto proto = STORAGE_TYPE_SETTER.set(writeBlockProtoBuilder, storageType).build();
int protoLen = proto.getSerializedSize();
ByteBuf buffer = channel.alloc()
.buffer(3 + CodedOutputStream.computeRawVarint32Size(protoLen) + protoLen);
buffer.writeShort(DataTransferProtocol.DATA_TRANSFER_VERSION);
buffer.writeByte(Op.WRITE_BLOCK.code);
proto.writeDelimitedTo(new ByteBufOutputStream(buffer));
channel.writeAndFlush(buffer);
}
private static List<Future<Channel>> connectToDataNodes(Configuration conf, String clientName,
LocatedBlock locatedBlock, long maxBytesRcvd, long latestGS, BlockConstructionStage stage,
DataChecksum summer, EventLoop eventLoop) {
Enum<?>[] storageTypes = locatedBlock.getStorageTypes();
DatanodeInfo[] datanodeInfos = locatedBlock.getLocations();
boolean connectToDnViaHostname = conf.getBoolean(DFS_CLIENT_USE_DN_HOSTNAME,
DFS_CLIENT_USE_DN_HOSTNAME_DEFAULT);
final int timeoutMs = conf.getInt(DFS_CLIENT_SOCKET_TIMEOUT_KEY,
HdfsServerConstants.READ_TIMEOUT);
ExtendedBlock blockCopy = new ExtendedBlock(locatedBlock.getBlock());
blockCopy.setNumBytes(locatedBlock.getBlockSize());
ClientOperationHeaderProto header = ClientOperationHeaderProto.newBuilder()
.setBaseHeader(BaseHeaderProto.newBuilder().setBlock(PBHelper.convert(blockCopy))
.setToken(PBHelper.convert(locatedBlock.getBlockToken())))
.setClientName(clientName).build();
ChecksumProto checksumProto = DataTransferProtoUtil.toProto(summer);
final OpWriteBlockProto.Builder writeBlockProtoBuilder = OpWriteBlockProto.newBuilder()
.setHeader(header).setStage(OpWriteBlockProto.BlockConstructionStage.valueOf(stage.name()))
.setPipelineSize(1).setMinBytesRcvd(locatedBlock.getBlock().getNumBytes())
.setMaxBytesRcvd(maxBytesRcvd).setLatestGenerationStamp(latestGS)
.setRequestedChecksum(checksumProto)
.setCachingStrategy(CachingStrategyProto.newBuilder().setDropBehind(true).build());
List<Future<Channel>> futureList = new ArrayList<>(datanodeInfos.length);
for (int i = 0; i < datanodeInfos.length; i++) {
final DatanodeInfo dnInfo = datanodeInfos[i];
// Use Enum here because StoregType is moved to another package in hadoop 2.6. Use StorageType
// will cause compilation error for hadoop 2.5 or before.
final Enum<?> storageType = storageTypes[i];
final Promise<Channel> promise = eventLoop.newPromise();
futureList.add(promise);
String dnAddr = dnInfo.getXferAddr(connectToDnViaHostname);
new Bootstrap().group(eventLoop).channel(NioSocketChannel.class)
.option(CONNECT_TIMEOUT_MILLIS, timeoutMs).handler(new ChannelInitializer<Channel>() {
@Override
protected void initChannel(Channel ch) throws Exception {
processWriteBlockResponse(ch, dnInfo, promise, timeoutMs);
}
}).connect(NetUtils.createSocketAddr(dnAddr)).addListener(new ChannelFutureListener() {
@Override
public void operationComplete(ChannelFuture future) throws Exception {
if (future.isSuccess()) {
requestWriteBlock(future.channel(), storageType, writeBlockProtoBuilder);
} else {
promise.tryFailure(future.cause());
}
}
});
}
return futureList;
}
private static FanOutOneBlockAsyncDFSOutput createOutput(DistributedFileSystem dfs, String src,
boolean overwrite, boolean createParent, short replication, long blockSize,
EventLoop eventLoop) throws IOException {
Configuration conf = dfs.getConf();
FSUtils fsUtils = FSUtils.getInstance(dfs, conf);
DFSClient client = dfs.getClient();
String clientName = client.getClientName();
ClientProtocol namenode = client.getNamenode();
HdfsFileStatus stat = FILE_CREATER.create(namenode, src,
FsPermission.getFileDefault().applyUMask(FsPermission.getUMask(conf)), clientName,
new EnumSetWritable<CreateFlag>(
overwrite ? EnumSet.of(CREATE, OVERWRITE) : EnumSet.of(CREATE)),
createParent, replication, blockSize);
beginFileLease(client, src, stat.getFileId());
boolean succ = false;
LocatedBlock locatedBlock = null;
List<Channel> datanodeList = new ArrayList<>();
try {
DataChecksum summer = createChecksum(client);
locatedBlock = namenode.addBlock(src, client.getClientName(), null, null, stat.getFileId(),
null);
for (Future<Channel> future : connectToDataNodes(conf, clientName, locatedBlock, 0L, 0L,
PIPELINE_SETUP_CREATE, summer, eventLoop)) {
// fail the creation if there are connection failures since we are fail-fast. The upper
// layer should retry itself if needed.
datanodeList.add(future.syncUninterruptibly().getNow());
}
succ = true;
return new FanOutOneBlockAsyncDFSOutput(conf, fsUtils, dfs, client, namenode, clientName, src,
stat.getFileId(), locatedBlock, eventLoop, datanodeList, summer, ALLOC);
} finally {
if (!succ) {
for (Channel c : datanodeList) {
c.close();
}
endFileLease(client, src, stat.getFileId());
fsUtils.recoverFileLease(dfs, new Path(src), conf, new CancelOnClose(client));
}
}
}
/**
* Create a {@link FanOutOneBlockAsyncDFSOutput}. The method maybe blocked so do not call it
* inside {@link EventLoop}.
* @param eventLoop all connections to datanode will use the same event loop.
*/
public static FanOutOneBlockAsyncDFSOutput createOutput(final DistributedFileSystem dfs, Path f,
final boolean overwrite, final boolean createParent, final short replication,
final long blockSize, final EventLoop eventLoop) throws IOException {
return new FileSystemLinkResolver<FanOutOneBlockAsyncDFSOutput>() {
@Override
public FanOutOneBlockAsyncDFSOutput doCall(Path p)
throws IOException, UnresolvedLinkException {
return createOutput(dfs, p.toUri().getPath(), overwrite, createParent, replication,
blockSize, eventLoop);
}
@Override
public FanOutOneBlockAsyncDFSOutput next(FileSystem fs, Path p) throws IOException {
throw new UnsupportedOperationException();
}
}.resolve(dfs, f);
}
static void completeFile(DFSClient client, ClientProtocol namenode, String src, String clientName,
ExtendedBlock block, long fileId) {
for (int retry = 0;; retry++) {
try {
if (namenode.complete(src, clientName, block, fileId)) {
endFileLease(client, src, fileId);
return;
} else {
LOG.warn("complete file " + src + " not finished, retry = " + retry);
}
} catch (LeaseExpiredException e) {
LOG.warn("lease for file " + src + " is expired, give up", e);
return;
} catch (Exception e) {
LOG.warn("complete file " + src + " failed, retry = " + retry, e);
}
sleepIgnoreInterrupt(retry);
}
}
static void sleepIgnoreInterrupt(int retry) {
try {
Thread.sleep(ConnectionUtils.getPauseTime(100, retry));
} catch (InterruptedException e) {
}
}
}

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@ -0,0 +1,61 @@
/**
* 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.hadoop.hbase.util;
import java.nio.channels.CompletionHandler;
import java.util.concurrent.ExecutionException;
public final class FanOutOneBlockAsyncDFSOutputFlushHandler
implements CompletionHandler<Long, Void> {
private long size;
private Throwable error;
private boolean finished;
@Override
public synchronized void completed(Long result, Void attachment) {
size = result.longValue();
finished = true;
notifyAll();
}
@Override
public synchronized void failed(Throwable exc, Void attachment) {
error = exc;
finished = true;
notifyAll();
}
public synchronized long get() throws InterruptedException, ExecutionException {
while (!finished) {
wait();
}
if (error != null) {
throw new ExecutionException(error);
}
return size;
}
public void reset() {
size = 0L;
error = null;
finished = false;
}
}

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/**
* 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.hadoop.hbase.util;
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_CLIENT_SOCKET_TIMEOUT_KEY;
import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
import io.netty.channel.EventLoop;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ThreadLocalRandom;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.HBaseTestingUtility;
import org.apache.hadoop.hbase.testclassification.MediumTests;
import org.apache.hadoop.hbase.testclassification.MiscTests;
import org.apache.hadoop.hdfs.DistributedFileSystem;
import org.apache.hadoop.ipc.RemoteException;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Rule;
import org.junit.Test;
import org.junit.experimental.categories.Category;
import org.junit.rules.TestName;
@Category({ MiscTests.class, MediumTests.class })
public class TestFanOutOneBlockAsyncDFSOutput {
private static final HBaseTestingUtility TEST_UTIL = new HBaseTestingUtility();
private static DistributedFileSystem FS;
private static EventLoopGroup EVENT_LOOP_GROUP;
private static int READ_TIMEOUT_MS = 2000;
@Rule
public TestName name = new TestName();
@BeforeClass
public static void setUp() throws Exception {
Logger.getLogger("org.apache.hadoop.hdfs.StateChange").setLevel(Level.DEBUG);
Logger.getLogger("BlockStateChange").setLevel(Level.DEBUG);
TEST_UTIL.getConfiguration().setInt(DFS_CLIENT_SOCKET_TIMEOUT_KEY, READ_TIMEOUT_MS);
TEST_UTIL.startMiniDFSCluster(3);
FS = TEST_UTIL.getDFSCluster().getFileSystem();
EVENT_LOOP_GROUP = new NioEventLoopGroup();
}
@AfterClass
public static void tearDown() throws IOException, InterruptedException {
if (EVENT_LOOP_GROUP != null) {
EVENT_LOOP_GROUP.shutdownGracefully().sync();
}
TEST_UTIL.shutdownMiniDFSCluster();
}
private void writeAndVerify(EventLoop eventLoop, Path f, final FanOutOneBlockAsyncDFSOutput out)
throws IOException, InterruptedException, ExecutionException {
final byte[] b = new byte[10];
ThreadLocalRandom.current().nextBytes(b);
final FanOutOneBlockAsyncDFSOutputFlushHandler handler =
new FanOutOneBlockAsyncDFSOutputFlushHandler();
eventLoop.execute(new Runnable() {
@Override
public void run() {
out.write(b, 0, b.length);
out.flush(null, handler, false);
}
});
assertEquals(b.length, handler.get());
out.close();
assertEquals(b.length, FS.getFileStatus(f).getLen());
byte[] actual = new byte[b.length];
try (FSDataInputStream in = FS.open(f)) {
in.readFully(actual);
}
assertArrayEquals(b, actual);
}
@Test
public void test() throws IOException, InterruptedException, ExecutionException {
Path f = new Path("/" + name.getMethodName());
EventLoop eventLoop = EVENT_LOOP_GROUP.next();
final FanOutOneBlockAsyncDFSOutput out =
FanOutOneBlockAsyncDFSOutputHelper.createOutput(FS, f, true, false, (short) 3,
FS.getDefaultBlockSize(), eventLoop);
writeAndVerify(eventLoop, f, out);
}
@Test
public void testRecover() throws IOException, InterruptedException, ExecutionException {
Path f = new Path("/" + name.getMethodName());
EventLoop eventLoop = EVENT_LOOP_GROUP.next();
final FanOutOneBlockAsyncDFSOutput out =
FanOutOneBlockAsyncDFSOutputHelper.createOutput(FS, f, true, false, (short) 3,
FS.getDefaultBlockSize(), eventLoop);
final byte[] b = new byte[10];
ThreadLocalRandom.current().nextBytes(b);
final FanOutOneBlockAsyncDFSOutputFlushHandler handler =
new FanOutOneBlockAsyncDFSOutputFlushHandler();
eventLoop.execute(new Runnable() {
@Override
public void run() {
out.write(b, 0, b.length);
out.flush(null, handler, false);
}
});
handler.get();
// restart one datanode which causes one connection broken
TEST_UTIL.getDFSCluster().restartDataNode(0);
handler.reset();
eventLoop.execute(new Runnable() {
@Override
public void run() {
out.write(b, 0, b.length);
out.flush(null, handler, false);
}
});
try {
handler.get();
fail("flush should fail");
} catch (ExecutionException e) {
// we restarted one datanode so the flush should fail
e.printStackTrace();
}
out.recoverAndClose(null);
assertEquals(b.length, FS.getFileStatus(f).getLen());
byte[] actual = new byte[b.length];
try (FSDataInputStream in = FS.open(f)) {
in.readFully(actual);
}
assertArrayEquals(b, actual);
}
@Test
public void testHeartbeat() throws IOException, InterruptedException, ExecutionException {
Path f = new Path("/" + name.getMethodName());
EventLoop eventLoop = EVENT_LOOP_GROUP.next();
final FanOutOneBlockAsyncDFSOutput out =
FanOutOneBlockAsyncDFSOutputHelper.createOutput(FS, f, true, false, (short) 3,
FS.getDefaultBlockSize(), eventLoop);
Thread.sleep(READ_TIMEOUT_MS * 2);
// the connection to datanode should still alive.
writeAndVerify(eventLoop, f, out);
}
/**
* This is important for fencing when recover from RS crash.
*/
@Test
public void testCreateParentFailed() throws IOException {
Path f = new Path("/" + name.getMethodName() + "/test");
EventLoop eventLoop = EVENT_LOOP_GROUP.next();
try {
FanOutOneBlockAsyncDFSOutputHelper.createOutput(FS, f, true, false, (short) 3,
FS.getDefaultBlockSize(), eventLoop);
fail("should fail with parent does not exist");
} catch (RemoteException e) {
assertTrue(e.unwrapRemoteException() instanceof FileNotFoundException);
}
}
}