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HDDS-5466. Refactor BlockOutputStream.
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...-hdds/client/src/main/java/org/apache/hadoop/hdds/scm/storage/RatisBlockOutputStream.java
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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.hdds.scm.storage; | ||
|
|
||
| import com.google.common.annotations.VisibleForTesting; | ||
| import org.apache.hadoop.hdds.client.BlockID; | ||
| import org.apache.hadoop.hdds.protocol.datanode.proto.ContainerProtos.ContainerCommandResponseProto; | ||
| import org.apache.hadoop.hdds.scm.OzoneClientConfig; | ||
| import org.apache.hadoop.hdds.scm.XceiverClientFactory; | ||
| import org.apache.hadoop.hdds.scm.XceiverClientReply; | ||
| import org.apache.hadoop.hdds.scm.pipeline.Pipeline; | ||
| import org.apache.hadoop.ozone.common.ChunkBuffer; | ||
| import org.apache.hadoop.security.token.Token; | ||
| import org.apache.hadoop.security.token.TokenIdentifier; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
|
|
||
| import java.io.IOException; | ||
| import java.io.OutputStream; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
| import java.util.concurrent.CompletableFuture; | ||
| import java.util.concurrent.ExecutionException; | ||
|
|
||
| /** | ||
| * An {@link OutputStream} used by the REST service in combination with the | ||
| * SCMClient to write the value of a key to a sequence | ||
| * of container chunks. Writes are buffered locally and periodically written to | ||
| * the container as a new chunk. In order to preserve the semantics that | ||
| * replacement of a pre-existing key is atomic, each instance of the stream has | ||
| * an internal unique identifier. This unique identifier and a monotonically | ||
| * increasing chunk index form a composite key that is used as the chunk name. | ||
| * After all data is written, a putKey call creates or updates the corresponding | ||
| * container key, and this call includes the full list of chunks that make up | ||
| * the key data. The list of chunks is updated all at once. Therefore, a | ||
| * concurrent reader never can see an intermediate state in which different | ||
| * chunks of data from different versions of the key data are interleaved. | ||
| * This class encapsulates all state management for buffering and writing | ||
| * through to the container. | ||
| */ | ||
| public class RatisBlockOutputStream extends BlockOutputStream { | ||
| public static final Logger LOG = LoggerFactory.getLogger( | ||
| RatisBlockOutputStream.class); | ||
|
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| // This object will maintain the commitIndexes and byteBufferList in order | ||
| // Also, corresponding to the logIndex, the corresponding list of buffers will | ||
| // be released from the buffer pool. | ||
| private final CommitWatcher commitWatcher; | ||
|
|
||
| /** | ||
| * Creates a new BlockOutputStream. | ||
| * | ||
| * @param blockID block ID | ||
| * @param bufferPool pool of buffers | ||
| */ | ||
| public RatisBlockOutputStream( | ||
| BlockID blockID, | ||
| XceiverClientFactory xceiverClientManager, | ||
| Pipeline pipeline, | ||
| BufferPool bufferPool, | ||
| OzoneClientConfig config, | ||
| Token<? extends TokenIdentifier> token | ||
| ) throws IOException { | ||
| super(blockID, xceiverClientManager, pipeline, bufferPool, config, token); | ||
| this.commitWatcher = new CommitWatcher(bufferPool, getXceiverClient()); | ||
| } | ||
|
|
||
| @Override | ||
| public long getTotalAckDataLength() { | ||
| return commitWatcher.getTotalAckDataLength(); | ||
| } | ||
|
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| @VisibleForTesting | ||
| public Map<Long, List<ChunkBuffer>> getCommitIndex2flushedDataMap() { | ||
| return commitWatcher.getCommitIndex2flushedDataMap(); | ||
| } | ||
|
|
||
| @Override | ||
| void releaseBuffersOnException() { | ||
| commitWatcher.releaseBuffersOnException(); | ||
| } | ||
|
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| @Override | ||
| XceiverClientReply sendWatchForCommit(boolean bufferFull) throws IOException { | ||
| return bufferFull? commitWatcher.watchOnFirstIndex() | ||
| : commitWatcher.watchOnLastIndex(); | ||
| } | ||
|
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||
| @Override | ||
| void updateCommitInfo(XceiverClientReply reply, List<ChunkBuffer> byteBufferList) { | ||
| commitWatcher.updateCommitInfoMap(reply.getLogIndex(), byteBufferList); | ||
| } | ||
|
|
||
| @Override | ||
| void putFlushFuture(long flushPos, | ||
| CompletableFuture<ContainerCommandResponseProto> flushFuture) { | ||
| commitWatcher.getFutureMap().put(flushPos, flushFuture); | ||
| } | ||
|
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| @Override | ||
| void waitOnFlushFutures() throws InterruptedException, ExecutionException { | ||
| // wait for all the transactions to complete | ||
| CompletableFuture.allOf(commitWatcher.getFutureMap().values().toArray( | ||
| new CompletableFuture[0])).get(); | ||
| } | ||
|
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| @Override | ||
| void waitFullBuffer() throws ExecutionException, InterruptedException { | ||
| if (!commitWatcher.getFutureMap().isEmpty()) { | ||
| waitOnFlushFutures(); | ||
| } | ||
| } | ||
|
|
||
| @Override | ||
| void cleanup() { | ||
| commitWatcher.cleanup(); | ||
| } | ||
| } |
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