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LocalSnapshotDirectoryProviderImpl.java
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LocalSnapshotDirectoryProviderImpl.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.runtime.state;
import org.apache.flink.annotation.VisibleForTesting;
import org.apache.flink.api.common.JobID;
import org.apache.flink.runtime.jobgraph.JobVertexID;
import org.apache.flink.util.Preconditions;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.annotation.Nonnegative;
import javax.annotation.Nonnull;
import java.io.File;
import java.nio.file.Paths;
import java.util.Arrays;
/** Implementation of {@link LocalSnapshotDirectoryProvider}. */
public class LocalSnapshotDirectoryProviderImpl implements LocalSnapshotDirectoryProvider {
/** Serial version. */
private static final long serialVersionUID = 1L;
/** Logger for this class. */
private static final Logger LOG =
LoggerFactory.getLogger(LocalSnapshotDirectoryProviderImpl.class);
/** All available root directories that this can potentially deliver. */
@Nonnull private final File[] allocationBaseDirs;
/** JobID of the owning job. */
@Nonnull private final JobID jobID;
/** JobVertexID of the owning task. */
@Nonnull private final JobVertexID jobVertexID;
/** Index of the owning subtask. */
@Nonnegative private final int subtaskIndex;
public LocalSnapshotDirectoryProviderImpl(
File allocationBaseDir,
@Nonnull JobID jobID,
@Nonnull JobVertexID jobVertexID,
@Nonnegative int subtaskIndex) {
this(new File[] {allocationBaseDir}, jobID, jobVertexID, subtaskIndex);
}
public LocalSnapshotDirectoryProviderImpl(
@Nonnull File[] allocationBaseDirs,
@Nonnull JobID jobID,
@Nonnull JobVertexID jobVertexID,
@Nonnegative int subtaskIndex) {
Preconditions.checkArgument(allocationBaseDirs.length > 0);
this.allocationBaseDirs = allocationBaseDirs;
this.jobID = jobID;
this.jobVertexID = jobVertexID;
this.subtaskIndex = subtaskIndex;
for (File allocationBaseDir : allocationBaseDirs) {
Preconditions.checkNotNull(allocationBaseDir);
allocationBaseDir.mkdirs();
}
}
@Override
public File allocationBaseDirectory(long checkpointId) {
return selectAllocationBaseDirectory(
(((int) checkpointId) & Integer.MAX_VALUE) % allocationBaseDirs.length);
}
@Override
public File subtaskBaseDirectory(long checkpointId) {
return new File(allocationBaseDirectory(checkpointId), subtaskDirString());
}
@Override
public File subtaskSpecificCheckpointDirectory(long checkpointId) {
return new File(subtaskBaseDirectory(checkpointId), checkpointDirString(checkpointId));
}
@Override
public File selectAllocationBaseDirectory(int idx) {
return allocationBaseDirs[idx];
}
@Override
public File selectSubtaskBaseDirectory(int idx) {
return new File(selectAllocationBaseDirectory(idx), subtaskDirString());
}
@Override
public int allocationBaseDirsCount() {
return allocationBaseDirs.length;
}
@Override
public String toString() {
return "LocalRecoveryDirectoryProvider{"
+ "rootDirectories="
+ Arrays.toString(allocationBaseDirs)
+ ", jobID="
+ jobID
+ ", jobVertexID="
+ jobVertexID
+ ", subtaskIndex="
+ subtaskIndex
+ '}';
}
@VisibleForTesting
String subtaskDirString() {
return Paths.get("jid_" + jobID, "vtx_" + jobVertexID + "_sti_" + subtaskIndex).toString();
}
@VisibleForTesting
String checkpointDirString(long checkpointId) {
return "chk_" + checkpointId;
}
}