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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.runtime.state.gemini.engine.snapshot;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.core.fs.Path;
import org.apache.flink.runtime.state.SnapshotDirectory;
import org.apache.flink.runtime.state.gemini.engine.dbms.GContext;
import org.apache.flink.runtime.state.gemini.engine.filecache.PageBatchFlusher;
import org.apache.flink.runtime.state.gemini.engine.fs.FileManager;
import org.apache.flink.util.Preconditions;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
/**
* Snapshot operation which will only snapshot to dfs.
*/
public class DFSSnapshotOperation extends SnapshotOperation {
private static final Logger LOG = LoggerFactory.getLogger(DFSSnapshotOperation.class);
private final FileManager dfsFileManager;
private SnapshotManager.PendingSnapshot pendingSnapshot;
public DFSSnapshotOperation(
GContext gContext,
SnapshotManager snapshotManager,
FileManager dfsFileManager) {
super(gContext, snapshotManager);
this.dfsFileManager = Preconditions.checkNotNull(dfsFileManager);
}
@Override
public SnapshotManager.PendingSnapshot createPendingSnapshot(
BackendSnapshotMeta backendSnapshotMeta,
long accessNumber) {
long checkpointId = backendSnapshotMeta.getCheckpointId();
SnapshotCompletableFuture snapshotCompletableFuture =
new SnapshotCompletableFuture(snapshotManager.getSnapshotExecutor());
Path dfsSnapshotBasePath = dfsFileManager.getBasePath();
Path dfsMetaPath = ((SnapshotManagerImpl) snapshotManager).getDFSSnapshotMetaPath(
dfsSnapshotBasePath, checkpointId);
PageBatchFlusher dfsPageBatchFlusher = new PageBatchFlusher(
gContext.getGConfiguration().getSnapshotFlushBatchNumPage(),
gContext.getGConfiguration().getSnapshotFlushBatchDataSize(),
isForceFlushPage(),
gContext.getSupervisor().getFileCache(),
gContext.getSupervisor().getSnapshotExecutorGroup());
SnapshotManager.PendingSnapshot pendingSnapshot =
new SnapshotManager.PendingSnapshot(
checkpointId,
backendSnapshotMeta.getTimestamp(),
snapshotCompletableFuture,
dfsSnapshotBasePath,
dfsMetaPath,
null,
null,
accessNumber,
this,
dfsPageBatchFlusher);
SnapshotCompaction snapshotCompaction =
gContext.getGConfiguration().isSnapshotCompactionEnabled() ?
new SnapshotCompactionImpl(gContext, pendingSnapshot) :
new NoSnapshotCompaction();
snapshotCompletableFuture.addSnapshotStage(snapshotCompaction);
SnapshotFileSyncStage fileSyncStage = new SnapshotFileSyncStage(
snapshotCompletableFuture,
gContext.getSupervisor().getFileCache());
snapshotCompletableFuture.addSnapshotStage(fileSyncStage);
snapshotCompletableFuture.addSnapshotStage(
new SnapshotMetaStage(snapshotCompletableFuture, this));
snapshotCompletableFuture.setPendingSnapshot(pendingSnapshot);
pendingSnapshot.setSnapshotCompaction(snapshotCompaction);
this.pendingSnapshot = pendingSnapshot;
return pendingSnapshot;
}
@Override
public SnapshotManager.PendingSnapshot getPendingSnapshot() {
return pendingSnapshot;
}
@Override
public DBSnapshotResult getSnapshotResult() throws Exception {
SnapshotMetaFile.Writer writer = null;
try {
writer = SnapshotMetaFile.getWriter(pendingSnapshot.getSnapshotMetaPath());
RegionSnapshot regionSnapshot = new RegionSnapshot(dfsFileManager, writer, false);
// {fileId -> {fileId, }}
Map>> fileMapping = new HashMap<>();
long[] regionOffsets = writeRegionMetaAndPageIndex(
pendingSnapshot.getGRegionSnapshotMeta(),
Collections.singletonList(regionSnapshot),
Collections.singletonList(fileMapping)).iterator().next();
pendingSnapshot.setFileMapping(fileMapping);
Tuple2 fileMappingOffsets = writeDfsAndLocalFileMapping(pendingSnapshot, writer, null, dfsFileManager);
long snapshotMetaSize = writer.getPos();
SnapshotStat snapshotStat = pendingSnapshot.getSnapshotStat();
snapshotStat.addAndGetTotalFiles(fileMapping.size());
snapshotStat.setMetaFileSize(snapshotMetaSize);
DBSnapshotMeta dbSnapshotMeta = new DBSnapshotMeta(
pendingSnapshot.getCheckpointId(),
gContext.getStartRegionId(),
gContext.getEndRegionId(),
regionOffsets,
fileMappingOffsets.f0,
fileMappingOffsets.f1,
snapshotMetaSize,
snapshotStat.addAndGetTotalSize(0),
snapshotStat.addAndGetIncrementalSize(0),
writer.getFilePath().toUri().toString(),
snapshotManager.getNameSpace());
writer.close();
return new DBSnapshotResult(SnapshotDirectory.permanent(pendingSnapshot.getSnapshotBasePath()), dbSnapshotMeta);
} catch (Exception e) {
LOG.error("Failed to snapshot meta for checkpoint " + pendingSnapshot.getCheckpointId(), e);
closeAndDeleteWriterQuietly(writer);
throw e;
}
}
}
