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StreamingFileCommitter.java
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StreamingFileCommitter.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.flink.table.filesystem.stream;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.core.fs.FileSystem;
import org.apache.flink.core.fs.Path;
import org.apache.flink.runtime.state.StateInitializationContext;
import org.apache.flink.runtime.state.StateSnapshotContext;
import org.apache.flink.streaming.api.operators.AbstractStreamOperator;
import org.apache.flink.streaming.api.operators.OneInputStreamOperator;
import org.apache.flink.streaming.api.watermark.Watermark;
import org.apache.flink.streaming.runtime.streamrecord.StreamRecord;
import org.apache.flink.table.filesystem.TableMetaStoreFactory;
import java.io.Serializable;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Set;
import java.util.TreeMap;
import static org.apache.flink.table.filesystem.FileSystemOptions.PARTITION_COMMIT_POLICY_SUCCESS_FILE_NAME;
import static org.apache.flink.table.filesystem.FileSystemOptions.PARTITION_COMMIT_POLICY_TYPE;
import static org.apache.flink.table.utils.PartitionPathUtils.extractPartitionSpecFromPath;
import static org.apache.flink.table.utils.PartitionPathUtils.generatePartitionPath;
/**
* Committer for {@link StreamingFileWriter}. This is the single (non-parallel) task.
*/
public class StreamingFileCommitter extends AbstractStreamOperator<Void>
implements OneInputStreamOperator<StreamingFileCommitter.CommitMessage, Void> {
private static final long serialVersionUID = 1L;
private final Configuration conf;
private final List<String> partitionKeys;
private final TableMetaStoreFactory metaStoreFactory;
private transient PartitionCommitManager commitManager;
private transient TaskTracker taskTracker;
private transient long currentWatermark = Long.MIN_VALUE;
private transient List<PartitionCommitPolicy> policies;
public StreamingFileCommitter(
List<String> partitionKeys, TableMetaStoreFactory metaStoreFactory, Configuration conf) {
this.partitionKeys = partitionKeys;
this.metaStoreFactory = metaStoreFactory;
this.conf = conf;
}
@Override
public void initializeState(StateInitializationContext context) throws Exception {
super.initializeState(context);
this.commitManager = new PartitionCommitManager(
context.isRestored(),
context.getOperatorStateStore(),
getUserCodeClassloader(),
partitionKeys,
conf);
this.policies = PartitionCommitPolicy.createCommitChain(
conf.get(PARTITION_COMMIT_POLICY_TYPE),
conf.get(PARTITION_COMMIT_POLICY_SUCCESS_FILE_NAME));
}
@Override
public void processElement(StreamRecord<CommitMessage> element) throws Exception {
CommitMessage message = element.getValue();
for (String partition : message.partitions) {
commitManager.addPartition(partition);
}
if (taskTracker == null) {
taskTracker = new TaskTracker(message.numberOfTasks);
}
boolean needCommit = taskTracker.add(message.checkpointId, message.taskId);
if (needCommit) {
commitPartitions(commitManager.triggerCommit(message.checkpointId));
}
}
private void commitPartitions(List<String> partitions) throws Exception {
try (TableMetaStoreFactory.TableMetaStore metaStore = metaStoreFactory.createTableMetaStore()) {
FileSystem fs = metaStore.getLocationPath().getFileSystem();
for (String partition : partitions) {
LinkedHashMap<String, String> partSpec = extractPartitionSpecFromPath(new Path(partition));
Path path = new Path(metaStore.getLocationPath(), generatePartitionPath(partSpec));
for (PartitionCommitPolicy policy : policies) {
policy.commit(partSpec, path, fs, metaStore);
}
}
}
}
@Override
public void processWatermark(Watermark mark) throws Exception {
super.processWatermark(mark);
this.currentWatermark = mark.getTimestamp();
}
@Override
public void snapshotState(StateSnapshotContext context) throws Exception {
super.snapshotState(context);
commitManager.snapshotState(context.getCheckpointId(), currentWatermark);
}
/**
* The message sent upstream.
*/
public static class CommitMessage implements Serializable {
public long checkpointId;
public int taskId;
public int numberOfTasks;
public List<String> partitions;
public CommitMessage() {}
public CommitMessage(
long checkpointId, int taskId, int numberOfTasks, List<String> partitions) {
this.checkpointId = checkpointId;
this.taskId = taskId;
this.numberOfTasks = numberOfTasks;
this.partitions = partitions;
}
}
private static class TaskTracker {
private final int numberOfTasks;
/**
* Checkpoint id to notified tasks.
*/
private TreeMap<Long, Set<Integer>> notifiedTasks = new TreeMap<>();
private TaskTracker(int numberOfTasks) {
this.numberOfTasks = numberOfTasks;
}
/**
* @return true, if this checkpoint id need be committed.
*/
private boolean add(long checkpointId, int task) {
Set<Integer> tasks = notifiedTasks.computeIfAbsent(checkpointId, (k) -> new HashSet<>());
tasks.add(task);
if (tasks.size() == numberOfTasks) {
notifiedTasks.headMap(checkpointId, true).clear();
return true;
}
return false;
}
}
}