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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.dispatcher;
import org.apache.flink.annotation.VisibleForTesting;
import org.apache.flink.api.common.JobID;
import org.apache.flink.api.common.JobStatus;
import org.apache.flink.api.common.time.Time;
import org.apache.flink.runtime.executiongraph.ArchivedExecutionGraph;
import org.apache.flink.runtime.messages.webmonitor.JobDetails;
import org.apache.flink.runtime.messages.webmonitor.JobsOverview;
import org.apache.flink.runtime.scheduler.ExecutionGraphInfo;
import org.apache.flink.util.FileUtils;
import org.apache.flink.util.InstantiationUtil;
import org.apache.flink.util.Preconditions;
import org.apache.flink.util.ShutdownHookUtil;
import org.apache.flink.util.concurrent.ScheduledExecutor;
import org.apache.flink.shaded.guava30.com.google.common.base.Ticker;
import org.apache.flink.shaded.guava30.com.google.common.cache.Cache;
import org.apache.flink.shaded.guava30.com.google.common.cache.CacheBuilder;
import org.apache.flink.shaded.guava30.com.google.common.cache.CacheLoader;
import org.apache.flink.shaded.guava30.com.google.common.cache.LoadingCache;
import org.apache.flink.shaded.guava30.com.google.common.cache.RemovalListener;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.annotation.Nullable;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Collection;
import java.util.UUID;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;
/**
* Store for {@link ExecutionGraphInfo} instances. The store writes the archived execution graph
* information to disk and keeps the most recently used execution graphs in a memory cache for
* faster serving. Moreover, the stored execution graphs are periodically cleaned up.
*/
public class FileExecutionGraphInfoStore implements ExecutionGraphInfoStore {
private static final Logger LOG = LoggerFactory.getLogger(FileExecutionGraphInfoStore.class);
private final File storageDir;
private final Cache jobDetailsCache;
private final LoadingCache executionGraphInfoCache;
private final ScheduledFuture cleanupFuture;
private final Thread shutdownHook;
private int numFinishedJobs;
private int numFailedJobs;
private int numCanceledJobs;
public FileExecutionGraphInfoStore(
File rootDir,
Time expirationTime,
int maximumCapacity,
long maximumCacheSizeBytes,
ScheduledExecutor scheduledExecutor,
Ticker ticker)
throws IOException {
final File storageDirectory = initExecutionGraphStorageDirectory(rootDir);
LOG.info(
"Initializing {}: Storage directory {}, expiration time {}, maximum cache size {} bytes.",
FileExecutionGraphInfoStore.class.getSimpleName(),
storageDirectory,
expirationTime.toMilliseconds(),
maximumCacheSizeBytes);
this.storageDir = Preconditions.checkNotNull(storageDirectory);
Preconditions.checkArgument(
storageDirectory.exists() && storageDirectory.isDirectory(),
"The storage directory must exist and be a directory.");
this.jobDetailsCache =
CacheBuilder.newBuilder()
.expireAfterWrite(expirationTime.toMilliseconds(), TimeUnit.MILLISECONDS)
.maximumSize(maximumCapacity)
.removalListener(
(RemovalListener)
notification ->
deleteExecutionGraphFile(notification.getKey()))
.ticker(ticker)
.build();
this.executionGraphInfoCache =
CacheBuilder.newBuilder()
.maximumWeight(maximumCacheSizeBytes)
.weigher(this::calculateSize)
.build(
new CacheLoader() {
@Override
public ExecutionGraphInfo load(JobID jobId) throws Exception {
return loadExecutionGraph(jobId);
}
});
this.cleanupFuture =
scheduledExecutor.scheduleWithFixedDelay(
jobDetailsCache::cleanUp,
expirationTime.toMilliseconds(),
expirationTime.toMilliseconds(),
TimeUnit.MILLISECONDS);
this.shutdownHook = ShutdownHookUtil.addShutdownHook(this, getClass().getSimpleName(), LOG);
this.numFinishedJobs = 0;
this.numFailedJobs = 0;
this.numCanceledJobs = 0;
}
@Override
public int size() {
return Math.toIntExact(jobDetailsCache.size());
}
@Override
@Nullable
public ExecutionGraphInfo get(JobID jobId) {
try {
return executionGraphInfoCache.get(jobId);
} catch (ExecutionException e) {
LOG.debug(
"Could not load archived execution graph information for job id {}.", jobId, e);
return null;
}
}
@Override
public void put(ExecutionGraphInfo executionGraphInfo) throws IOException {
final JobID jobId = executionGraphInfo.getJobId();
final ArchivedExecutionGraph archivedExecutionGraph =
executionGraphInfo.getArchivedExecutionGraph();
final JobStatus jobStatus = archivedExecutionGraph.getState();
final String jobName = archivedExecutionGraph.getJobName();
Preconditions.checkArgument(
jobStatus.isTerminalState(),
"The job "
+ jobName
+ '('
+ jobId
+ ") is not in a terminal state. Instead it is in state "
+ jobStatus
+ '.');
switch (jobStatus) {
case FINISHED:
numFinishedJobs++;
break;
case CANCELED:
numCanceledJobs++;
break;
case FAILED:
numFailedJobs++;
break;
case SUSPENDED:
break;
default:
throw new IllegalStateException(
"The job "
+ jobName
+ '('
+ jobId
+ ") should have been in a known terminal state. "
+ "Instead it was in state "
+ jobStatus
+ '.');
}
// write the ArchivedExecutionGraph to disk
storeExecutionGraphInfo(executionGraphInfo);
final JobDetails detailsForJob = JobDetails.createDetailsForJob(archivedExecutionGraph);
jobDetailsCache.put(jobId, detailsForJob);
executionGraphInfoCache.put(jobId, executionGraphInfo);
}
@Override
public JobsOverview getStoredJobsOverview() {
return new JobsOverview(0, numFinishedJobs, numCanceledJobs, numFailedJobs);
}
@Override
public Collection getAvailableJobDetails() {
return jobDetailsCache.asMap().values();
}
@Nullable
@Override
public JobDetails getAvailableJobDetails(JobID jobId) {
return jobDetailsCache.getIfPresent(jobId);
}
@Override
public void close() throws IOException {
cleanupFuture.cancel(false);
jobDetailsCache.invalidateAll();
// clean up the storage directory
FileUtils.deleteFileOrDirectory(storageDir);
// Remove shutdown hook to prevent resource leaks
ShutdownHookUtil.removeShutdownHook(shutdownHook, getClass().getSimpleName(), LOG);
}
// --------------------------------------------------------------
// Internal methods
// --------------------------------------------------------------
private int calculateSize(JobID jobId, ExecutionGraphInfo serializableExecutionGraphInfo) {
final File executionGraphInfoFile = getExecutionGraphFile(jobId);
if (executionGraphInfoFile.exists()) {
return Math.toIntExact(executionGraphInfoFile.length());
} else {
LOG.debug(
"Could not find execution graph information file for {}. Estimating the size instead.",
jobId);
final ArchivedExecutionGraph serializableExecutionGraph =
serializableExecutionGraphInfo.getArchivedExecutionGraph();
return serializableExecutionGraph.getAllVertices().size() * 1000
+ serializableExecutionGraph.getAccumulatorsSerialized().size() * 1000;
}
}
private ExecutionGraphInfo loadExecutionGraph(JobID jobId)
throws IOException, ClassNotFoundException {
final File executionGraphInfoFile = getExecutionGraphFile(jobId);
if (executionGraphInfoFile.exists()) {
try (FileInputStream fileInputStream = new FileInputStream(executionGraphInfoFile)) {
return InstantiationUtil.deserializeObject(
fileInputStream, getClass().getClassLoader());
}
} else {
throw new FileNotFoundException(
"Could not find file for archived execution graph "
+ jobId
+ ". This indicates that the file either has been deleted or never written.");
}
}
private void storeExecutionGraphInfo(ExecutionGraphInfo executionGraphInfo) throws IOException {
final File archivedExecutionGraphFile =
getExecutionGraphFile(executionGraphInfo.getJobId());
try (FileOutputStream fileOutputStream = new FileOutputStream(archivedExecutionGraphFile)) {
InstantiationUtil.serializeObject(fileOutputStream, executionGraphInfo);
}
}
private File getExecutionGraphFile(JobID jobId) {
return new File(storageDir, jobId.toString());
}
private void deleteExecutionGraphFile(JobID jobId) {
Preconditions.checkNotNull(jobId);
final File archivedExecutionGraphFile = getExecutionGraphFile(jobId);
try {
FileUtils.deleteFileOrDirectory(archivedExecutionGraphFile);
} catch (IOException e) {
LOG.debug("Could not delete file {}.", archivedExecutionGraphFile, e);
}
executionGraphInfoCache.invalidate(jobId);
jobDetailsCache.invalidate(jobId);
}
private static File initExecutionGraphStorageDirectory(File tmpDir) throws IOException {
final int maxAttempts = 10;
for (int attempt = 0; attempt < maxAttempts; attempt++) {
final File storageDirectory =
new File(tmpDir, "executionGraphStore-" + UUID.randomUUID());
if (storageDirectory.mkdir()) {
return storageDirectory;
}
}
throw new IOException(
"Could not create executionGraphStorage directory in " + tmpDir + '.');
}
// --------------------------------------------------------------
// Testing methods
// --------------------------------------------------------------
@VisibleForTesting
File getStorageDir() {
return storageDir;
}
@VisibleForTesting
LoadingCache getExecutionGraphInfoCache() {
return executionGraphInfoCache;
}
}
