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本文主要研究一下 flink 的 jobstore 配置
JobManagerOptions
flink-1.7.2/flink-core/src/main/java/org/apache/flink/configuration/JobManagerOptions.java
@PublicEvolving
public class JobManagerOptions {
//……
/**
* The job store cache size in bytes which is used to keep completed
* jobs in memory.
*/
public static final ConfigOption<Long> JOB_STORE_CACHE_SIZE =
key(“jobstore.cache-size”)
.defaultValue(50L * 1024L * 1024L)
.withDescription(“The job store cache size in bytes which is used to keep completed jobs in memory.”);
/**
* The time in seconds after which a completed job expires and is purged from the job store.
*/
public static final ConfigOption<Long> JOB_STORE_EXPIRATION_TIME =
key(“jobstore.expiration-time”)
.defaultValue(60L * 60L)
.withDescription(“The time in seconds after which a completed job expires and is purged from the job store.”);
//……
}
jobstore.cache-size 默认是 50M；jobstore.expiration-time 默认是 1 小时
SessionClusterEntrypoint
flink-1.7.2/flink-runtime/src/main/java/org/apache/flink/runtime/entrypoint/SessionClusterEntrypoint.java
public abstract class SessionClusterEntrypoint extends ClusterEntrypoint {
public SessionClusterEntrypoint(Configuration configuration) {
super(configuration);
}
@Override
protected ArchivedExecutionGraphStore createSerializableExecutionGraphStore(
Configuration configuration,
ScheduledExecutor scheduledExecutor) throws IOException {
final File tmpDir = new File(ConfigurationUtils.parseTempDirectories(configuration)[0]);
final Time expirationTime = Time.seconds(configuration.getLong(JobManagerOptions.JOB_STORE_EXPIRATION_TIME));
final long maximumCacheSizeBytes = configuration.getLong(JobManagerOptions.JOB_STORE_CACHE_SIZE);
return new FileArchivedExecutionGraphStore(
tmpDir,
expirationTime,
maximumCacheSizeBytes,
scheduledExecutor,
Ticker.systemTicker());
}
}
SessionClusterEntrypoint 的 createSerializableExecutionGraphStore 方法读取了 JobManagerOptions.JOB_STORE_EXPIRATION_TIME 及 JobManagerOptions.JOB_STORE_CACHE_SIZE 配置，然后创建 FileArchivedExecutionGraphStore
FileArchivedExecutionGraphStore
flink-1.7.2/flink-runtime/src/main/java/org/apache/flink/runtime/dispatcher/FileArchivedExecutionGraphStore.java
public class FileArchivedExecutionGraphStore implements ArchivedExecutionGraphStore {
private static final Logger LOG = LoggerFactory.getLogger(FileArchivedExecutionGraphStore.class);
private final File storageDir;
private final Cache<JobID, JobDetails> jobDetailsCache;
private final LoadingCache<JobID, ArchivedExecutionGraph> archivedExecutionGraphCache;
private final ScheduledFuture<?> cleanupFuture;
private final Thread shutdownHook;
private int numFinishedJobs;
private int numFailedJobs;
private int numCanceledJobs;
public FileArchivedExecutionGraphStore(
File rootDir,
Time expirationTime,
long maximumCacheSizeBytes,
ScheduledExecutor scheduledExecutor,
Ticker ticker) throws IOException {
final File storageDirectory = initExecutionGraphStorageDirectory(rootDir);
LOG.info(
“Initializing {}: Storage directory {}, expiration time {}, maximum cache size {} bytes.”,
FileArchivedExecutionGraphStore.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)
.removalListener(
(RemovalListener<JobID, JobDetails>) notification -> deleteExecutionGraphFile(notification.getKey()))
.ticker(ticker)
.build();
this.archivedExecutionGraphCache = CacheBuilder.newBuilder()
.maximumWeight(maximumCacheSizeBytes)
.weigher(this::calculateSize)
.build(new CacheLoader<JobID, ArchivedExecutionGraph>() {
@Override
public ArchivedExecutionGraph 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 ArchivedExecutionGraph get(JobID jobId) {
try {
return archivedExecutionGraphCache.get(jobId);
} catch (ExecutionException e) {
LOG.debug(“Could not load archived execution graph for job id {}.”, jobId, e);
return null;
}
}
@Override
public void put(ArchivedExecutionGraph archivedExecutionGraph) throws IOException {
final JobStatus jobStatus = archivedExecutionGraph.getState();
final JobID jobId = archivedExecutionGraph.getJobID();
final String jobName = archivedExecutionGraph.getJobName();
Preconditions.checkArgument(
jobStatus.isGloballyTerminalState(),
“The job ” + jobName + ‘(‘ + jobId +
“) is not in a globally terminal state. Instead it is in state ” + jobStatus + ‘.’);
switch (jobStatus) {
case FINISHED:
numFinishedJobs++;
break;
case CANCELED:
numCanceledJobs++;
break;
case FAILED:
numFailedJobs++;
break;
default:
throw new IllegalStateException(“The job ” + jobName + ‘(‘ +
jobId + “) should have been in a globally terminal state. ” +
“Instead it was in state ” + jobStatus + ‘.’);
}
// write the ArchivedExecutionGraph to disk
storeArchivedExecutionGraph(archivedExecutionGraph);
final JobDetails detailsForJob = WebMonitorUtils.createDetailsForJob(archivedExecutionGraph);
jobDetailsCache.put(jobId, detailsForJob);
archivedExecutionGraphCache.put(jobId, archivedExecutionGraph);
}
@Override
public JobsOverview getStoredJobsOverview() {
return new JobsOverview(0, numFinishedJobs, numCanceledJobs, numFailedJobs);
}
@Override
public Collection<JobDetails> 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, ArchivedExecutionGraph serializableExecutionGraph) {
final File archivedExecutionGraphFile = getExecutionGraphFile(jobId);
if (archivedExecutionGraphFile.exists()) {
return Math.toIntExact(archivedExecutionGraphFile.length());
} else {
LOG.debug(“Could not find archived execution graph file for {}. Estimating the size instead.”, jobId);
return serializableExecutionGraph.getAllVertices().size() * 1000 +
serializableExecutionGraph.getAccumulatorsSerialized().size() * 1000;
}
}
private ArchivedExecutionGraph loadExecutionGraph(JobID jobId) throws IOException, ClassNotFoundException {
final File archivedExecutionGraphFile = getExecutionGraphFile(jobId);
if (archivedExecutionGraphFile.exists()) {
try (FileInputStream fileInputStream = new FileInputStream(archivedExecutionGraphFile)) {
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 storeArchivedExecutionGraph(ArchivedExecutionGraph archivedExecutionGraph) throws IOException {
final File archivedExecutionGraphFile = getExecutionGraphFile(archivedExecutionGraph.getJobID());
try (FileOutputStream fileOutputStream = new FileOutputStream(archivedExecutionGraphFile)) {
InstantiationUtil.serializeObject(fileOutputStream, archivedExecutionGraph);
}
}
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);
}
archivedExecutionGraphCache.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<JobID, ArchivedExecutionGraph> getArchivedExecutionGraphCache() {
return archivedExecutionGraphCache;
}
}
FileArchivedExecutionGraphStore 实现了 ArchivedExecutionGraphStore 接口，它的构造器使用 guava cache 创建了 jobDetailsCache 及 archivedExecutionGraphCache
jobDetailsCache 的 expireAfterWrite 使用的是 expirationTime，即使用 jobstore.expiration-time 配置；archivedExecutionGraphCache 的 maximumWeight 使用的是 maximumCacheSizeBytes，即 jobstore.cache-size 配置
FileArchivedExecutionGraphStore 还设置了一个定时任务，每隔 expirationTime 的时间去执行 jobDetailsCache 的 cleanUp 方法来清理缓存
小结
flink 的 jobstore 有两个配置，分别是 jobstore.cache-size 默认是 50M，jobstore.expiration-time 默认是 1 小时
SessionClusterEntrypoint 的 createSerializableExecutionGraphStore 方法读取了 JobManagerOptions.JOB_STORE_EXPIRATION_TIME 及 JobManagerOptions.JOB_STORE_CACHE_SIZE 配置，然后创建 FileArchivedExecutionGraphStore
FileArchivedExecutionGraphStore 实现了 ArchivedExecutionGraphStore 接口，它的构造器使用 guava cache 创建了 jobDetailsCache 及 archivedExecutionGraphCache；jobDetailsCache 的 expireAfterWrite 使用的是 expirationTime，即使用 jobstore.expiration-time 配置；archivedExecutionGraphCache 的 maximumWeight 使用的是 maximumCacheSizeBytes，即 jobstore.cache-size 配置；它还设置了一个定时任务，每隔 expirationTime 的时间去执行 jobDetailsCache 的 cleanUp 方法来清理缓存
doc
jobstore-cache-size
jobstore-expiration-time
