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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.annotation.VisibleForTesting;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.core.fs.FileSystem;
import org.apache.flink.core.fs.Path;
import org.apache.flink.core.fs.local.LocalFileSystem;
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.exceptions.GeminiRuntimeException;
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.io.File;
import java.nio.file.Files;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
/**
* Snapshot operation which will snapshot to local and dfs.
*/
public class LocalAndDFSSnapshotOperation extends SnapshotOperation {
private static final Logger LOG = LoggerFactory.getLogger(LocalAndDFSSnapshotOperation.class);
private final FileManager dfsFileManager;
private final FileManager localFileManager;
private SnapshotManager.PendingSnapshot pendingSnapshot;
public LocalAndDFSSnapshotOperation(
GContext gContext,
SnapshotManager snapshotManager,
FileManager dfsFileManager,
FileManager localFileManager) {
super(gContext, snapshotManager);
this.dfsFileManager = Preconditions.checkNotNull(dfsFileManager);
this.localFileManager = Preconditions.checkNotNull(localFileManager);
}
@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);
Preconditions.checkNotNull(backendSnapshotMeta.getLocalSnapshotDir(),
"The local snapshot dir should not be null for backendSnapshotMeta.");
Path localSnapshotBasePath = backendSnapshotMeta.getLocalSnapshotDir().getDirectory();
Path localMetaPath = ((SnapshotManagerImpl) snapshotManager).getLocalSnapshotMetaPath(
localSnapshotBasePath, 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,
localSnapshotBasePath,
localMetaPath,
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 localWriter = null;
SnapshotMetaFile.Writer dfsWriter = null;
try {
localWriter = SnapshotMetaFile.getWriter(pendingSnapshot.getLocalSnapshotMetaPath());
RegionSnapshot localRegionSnapshot = new RegionSnapshot(localFileManager, localWriter, true);
dfsWriter = SnapshotMetaFile.getWriter(pendingSnapshot.getSnapshotMetaPath());
RegionSnapshot dfsRegionSnapshot = new RegionSnapshot(dfsFileManager, dfsWriter, false);
// >>
Map>> dfsFileMapping = new HashMap<>();
Map>> localFileMapping = new HashMap<>();
List regionOffsetsCollection = writeRegionMetaAndPageIndex(
pendingSnapshot.getGRegionSnapshotMeta(),
Arrays.asList(localRegionSnapshot, dfsRegionSnapshot),
Arrays.asList(localFileMapping, dfsFileMapping));
Preconditions.checkState(regionOffsetsCollection.size() == 2,
"Expected regionOffsets of size as 2, one if for local region, the other is for dfs region");
long[] localRegionOffsets = regionOffsetsCollection.get(0);
long[] dfsRegionOffsets = regionOffsetsCollection.get(1);
pendingSnapshot.setLocalFileMapping(localFileMapping);
pendingSnapshot.setFileMapping(dfsFileMapping);
// we need to update dfs file mapping for local writer.
Tuple2 localWriterFileMappingOffsets = writeDfsAndLocalFileMapping(pendingSnapshot, localWriter, localFileManager, dfsFileManager);
Tuple2 dfsWriterFileMappingOffsets = writeDfsAndLocalFileMapping(pendingSnapshot, dfsWriter, null, dfsFileManager);
long localSnapshotMetaSize = localWriter.getPos();
long dfsSnapshotMetaSize = dfsWriter.getPos();
SnapshotStat snapshotStat = pendingSnapshot.getSnapshotStat();
snapshotStat.addAndGetTotalLoalFiles(localFileMapping.size());
snapshotStat.setLocalMetaFileSize(localSnapshotMetaSize);
snapshotStat.addAndGetTotalFiles(dfsFileMapping.size());
snapshotStat.setMetaFileSize(dfsSnapshotMetaSize);
createHardLinkForLocalFiles(pendingSnapshot.getLocalSnapshotBasePath(), localFileMapping.keySet());
DBSnapshotMeta localDBSnapshotMeta = new DBSnapshotMeta(
pendingSnapshot.getCheckpointId(),
gContext.getStartRegionId(),
gContext.getEndRegionId(),
localRegionOffsets,
localWriterFileMappingOffsets.f0,
localWriterFileMappingOffsets.f1,
localSnapshotMetaSize,
snapshotStat.addAndGetTotalLocalSize(0),
snapshotStat.addAndGetLocalIncrementalSize(0),
localWriter.getFilePath().toUri().toString(),
snapshotManager.getNameSpace());
DBSnapshotMeta dfsDBSnapshotMeta = new DBSnapshotMeta(
pendingSnapshot.getCheckpointId(),
gContext.getStartRegionId(),
gContext.getEndRegionId(),
dfsRegionOffsets,
dfsWriterFileMappingOffsets.f0,
dfsWriterFileMappingOffsets.f1,
dfsSnapshotMetaSize,
snapshotStat.addAndGetTotalSize(0),
snapshotStat.addAndGetIncrementalSize(0),
dfsWriter.getFilePath().toUri().toString(),
snapshotManager.getNameSpace());
localWriter.close();
dfsWriter.close();
return new DBSnapshotResult(
SnapshotDirectory.permanent(pendingSnapshot.getLocalSnapshotBasePath()),
localDBSnapshotMeta,
SnapshotDirectory.permanent(pendingSnapshot.getSnapshotBasePath()),
dfsDBSnapshotMeta);
} catch (Exception e) {
LOG.error("Failed to snapshot meta for checkpoint " + pendingSnapshot.getCheckpointId(), e);
closeAndDeleteWriterQuietly(localWriter);
closeAndDeleteWriterQuietly(dfsWriter);
throw e;
}
}
@VisibleForTesting
void createHardLinkForLocalFiles(Path snapshotBasePath, Set fileIds) throws Exception {
FileSystem fileSystem = snapshotBasePath.getFileSystem();
if (!(fileSystem instanceof LocalFileSystem)) {
LOG.error("expected LocalFilSystem, actual {}", fileSystem);
throw new GeminiRuntimeException("hard link only works for local file system, actual " + fileSystem);
}
File snapshotBaseDir = new File(snapshotBasePath.toUri());
for (int fileId : fileIds) {
File file = new File(localFileManager.getFilePath(fileId));
try {
Files.createLink(new File(snapshotBaseDir, file.getName()).toPath(), file.toPath());
} catch (Exception e) {
LOG.error("Fail to create hard link from {} to {}.", file.getAbsolutePath(), snapshotBasePath.toUri().toString(), e);
throw e;
}
}
}
}
