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This module contains code to support integration with Amazon Web Services.
It also declares the dependencies needed to work with AWS services.
/*
* 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.hadoop.fs.s3a.commit;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.text.DateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.UUID;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import com.amazonaws.services.s3.model.MultipartUpload;
import org.apache.hadoop.thirdparty.com.google.common.annotations.VisibleForTesting;
import org.apache.hadoop.thirdparty.com.google.common.base.Preconditions;
import org.apache.hadoop.thirdparty.com.google.common.util.concurrent.ThreadFactoryBuilder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.commons.lang3.tuple.Pair;
import org.apache.commons.lang3.StringUtils;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.s3a.Invoker;
import org.apache.hadoop.fs.s3a.S3AFileSystem;
import org.apache.hadoop.fs.s3a.commit.files.PendingSet;
import org.apache.hadoop.fs.s3a.commit.files.SinglePendingCommit;
import org.apache.hadoop.fs.s3a.commit.files.SuccessData;
import org.apache.hadoop.fs.s3a.statistics.CommitterStatistics;
import org.apache.hadoop.fs.statistics.IOStatistics;
import org.apache.hadoop.fs.statistics.IOStatisticsSnapshot;
import org.apache.hadoop.fs.statistics.IOStatisticsSource;
import org.apache.hadoop.mapreduce.JobContext;
import org.apache.hadoop.mapreduce.JobID;
import org.apache.hadoop.mapreduce.JobStatus;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
import org.apache.hadoop.mapreduce.TaskAttemptID;
import org.apache.hadoop.mapreduce.lib.output.PathOutputCommitter;
import org.apache.hadoop.net.NetUtils;
import org.apache.hadoop.util.DurationInfo;
import org.apache.hadoop.util.concurrent.HadoopExecutors;
import static org.apache.hadoop.fs.s3a.Constants.THREAD_POOL_SHUTDOWN_DELAY_SECONDS;
import static org.apache.hadoop.fs.s3a.Invoker.ignoreIOExceptions;
import static org.apache.hadoop.fs.s3a.S3AUtils.*;
import static org.apache.hadoop.fs.s3a.Statistic.COMMITTER_COMMIT_JOB;
import static org.apache.hadoop.fs.s3a.commit.CommitConstants.*;
import static org.apache.hadoop.fs.s3a.commit.CommitUtils.*;
import static org.apache.hadoop.fs.s3a.commit.CommitUtilsWithMR.*;
import static org.apache.hadoop.fs.s3a.commit.InternalCommitterConstants.E_NO_SPARK_UUID;
import static org.apache.hadoop.fs.s3a.commit.InternalCommitterConstants.FS_S3A_COMMITTER_UUID;
import static org.apache.hadoop.fs.s3a.commit.InternalCommitterConstants.FS_S3A_COMMITTER_UUID_SOURCE;
import static org.apache.hadoop.fs.s3a.commit.InternalCommitterConstants.SPARK_WRITE_UUID;
import static org.apache.hadoop.fs.statistics.impl.IOStatisticsBinding.trackDurationOfInvocation;
/**
* Abstract base class for S3A committers; allows for any commonality
* between different architectures.
*
* Although the committer APIs allow for a committer to be created without
* an output path, this is not supported in this class or its subclasses:
* a destination must be supplied. It is left to the committer factory
* to handle the creation of a committer when the destination is unknown.
*
* Requiring an output directory simplifies coding and testing.
*
* The original implementation loaded all .pendingset files
* before attempting any commit/abort operations.
* While straightforward and guaranteeing that no changes were made to the
* destination until all files had successfully been loaded -it didn't scale;
* the list grew until it exceeded heap size.
*
* The second iteration builds up an {@link ActiveCommit} class with the
* list of .pendingset files to load and then commit; that can be done
* incrementally and in parallel.
* As a side effect of this change, unless/until changed,
* the commit/abort/revert of all files uploaded by a single task will be
* serialized. This may slow down these operations if there are many files
* created by a few tasks, and the HTTP connection pool in the S3A
* committer was large enough for more all the parallel POST requests.
*/
public abstract class AbstractS3ACommitter extends PathOutputCommitter
implements IOStatisticsSource {
private static final Logger LOG =
LoggerFactory.getLogger(AbstractS3ACommitter.class);
public static final String THREAD_PREFIX = "s3a-committer-pool-";
/**
* Error string when task setup fails.
*/
@VisibleForTesting
public static final String E_SELF_GENERATED_JOB_UUID
= "has a self-generated job UUID";
/**
* Unique ID for a Job.
* In MapReduce Jobs the YARN JobID suffices.
* On Spark this only be the YARN JobID
* it is known to be creating strongly unique IDs
* (i.e. SPARK-33402 is on the branch).
*/
private final String uuid;
/**
* Source of the {@link #uuid} value.
*/
private final JobUUIDSource uuidSource;
/**
* Has this instance been used for job setup?
* If so then it is safe for a locally generated
* UUID to be used for task setup.
*/
private boolean jobSetup;
/**
* Thread pool for task execution.
*/
private ExecutorService threadPool;
/** Underlying commit operations. */
private final CommitOperations commitOperations;
/**
* Final destination of work.
*/
private Path outputPath;
/**
* Role: used in log/text messages.
*/
private final String role;
/**
* This is the directory for all intermediate work: where the output format
* will write data.
* This may not be on the final file system
*/
private Path workPath;
/** Configuration of the job. */
private Configuration conf;
/** Filesystem of {@link #outputPath}. */
private FileSystem destFS;
/** The job context. For a task, this can be cast to a TaskContext. */
private final JobContext jobContext;
/** Should a job marker be created? */
private final boolean createJobMarker;
private final CommitterStatistics committerStatistics;
/**
* Create a committer.
* This constructor binds the destination directory and configuration, but
* does not update the work path: That must be calculated by the
* implementation;
* It is omitted here to avoid subclass methods being called too early.
* @param outputPath the job's output path: MUST NOT be null.
* @param context the task's context
* @throws IOException on a failure
*/
protected AbstractS3ACommitter(
Path outputPath,
TaskAttemptContext context) throws IOException {
super(outputPath, context);
Preconditions.checkArgument(outputPath != null, "null output path");
Preconditions.checkArgument(context != null, "null job context");
this.jobContext = context;
this.role = "Task committer " + context.getTaskAttemptID();
setConf(context.getConfiguration());
Pair id = buildJobUUID(
conf, context.getJobID());
this.uuid = id.getLeft();
this.uuidSource = id.getRight();
LOG.info("Job UUID {} source {}", getUUID(), getUUIDSource().getText());
initOutput(outputPath);
LOG.debug("{} instantiated for job \"{}\" ID {} with destination {}",
role, jobName(context), jobIdString(context), outputPath);
S3AFileSystem fs = getDestS3AFS();
this.createJobMarker = context.getConfiguration().getBoolean(
CREATE_SUCCESSFUL_JOB_OUTPUT_DIR_MARKER,
DEFAULT_CREATE_SUCCESSFUL_JOB_DIR_MARKER);
// the statistics are shared between this committer and its operations.
this.committerStatistics = fs.newCommitterStatistics();
this.commitOperations = new CommitOperations(fs, committerStatistics);
}
/**
* Init the output filesystem and path.
* TESTING ONLY; allows mock FS to cheat.
* @param out output path
* @throws IOException failure to create the FS.
*/
@VisibleForTesting
protected void initOutput(Path out) throws IOException {
FileSystem fs = getDestinationFS(out, getConf());
setDestFS(fs);
setOutputPath(fs.makeQualified(out));
}
/**
* Get the job/task context this committer was instantiated with.
* @return the context.
*/
public final JobContext getJobContext() {
return jobContext;
}
/**
* Final path of output, in the destination FS.
* @return the path
*/
@Override
public final Path getOutputPath() {
return outputPath;
}
/**
* Set the output path.
* @param outputPath new value
*/
protected final void setOutputPath(Path outputPath) {
Preconditions.checkNotNull(outputPath, "Null output path");
this.outputPath = outputPath;
}
/**
* This is the critical method for {@code FileOutputFormat}; it declares
* the path for work.
* @return the working path.
*/
@Override
public final Path getWorkPath() {
return workPath;
}
/**
* Set the work path for this committer.
* @param workPath the work path to use.
*/
protected final void setWorkPath(Path workPath) {
LOG.debug("Setting work path to {}", workPath);
this.workPath = workPath;
}
public final Configuration getConf() {
return conf;
}
protected final void setConf(Configuration conf) {
this.conf = conf;
}
/**
* Get the destination FS, creating it on demand if needed.
* @return the filesystem; requires the output path to be set up
* @throws IOException if the FS cannot be instantiated.
*/
public FileSystem getDestFS() throws IOException {
if (destFS == null) {
FileSystem fs = getDestinationFS(outputPath, getConf());
setDestFS(fs);
}
return destFS;
}
/**
* Get the destination as an S3A Filesystem; casting it.
* @return the dest S3A FS.
* @throws IOException if the FS cannot be instantiated.
*/
public S3AFileSystem getDestS3AFS() throws IOException {
return (S3AFileSystem) getDestFS();
}
/**
* Set the destination FS: the FS of the final output.
* @param destFS destination FS.
*/
protected void setDestFS(FileSystem destFS) {
this.destFS = destFS;
}
/**
* Compute the path where the output of a given job attempt will be placed.
* @param context the context of the job. This is used to get the
* application attempt ID.
* @return the path to store job attempt data.
*/
public Path getJobAttemptPath(JobContext context) {
return getJobAttemptPath(getAppAttemptId(context));
}
/**
* Compute the path where the output of a given job attempt will be placed.
* @param appAttemptId the ID of the application attempt for this job.
* @return the path to store job attempt data.
*/
protected abstract Path getJobAttemptPath(int appAttemptId);
/**
* Compute the path where the output of a task attempt is stored until
* that task is committed. This may be the normal Task attempt path
* or it may be a subdirectory.
* The default implementation returns the value of
* {@link #getBaseTaskAttemptPath(TaskAttemptContext)};
* subclasses may return different values.
* @param context the context of the task attempt.
* @return the path where a task attempt should be stored.
*/
public Path getTaskAttemptPath(TaskAttemptContext context) {
return getBaseTaskAttemptPath(context);
}
/**
* Compute the base path where the output of a task attempt is written.
* This is the path which will be deleted when a task is cleaned up and
* aborted.
*
* @param context the context of the task attempt.
* @return the path where a task attempt should be stored.
*/
protected abstract Path getBaseTaskAttemptPath(TaskAttemptContext context);
/**
* Get a temporary directory for data. When a task is aborted/cleaned
* up, the contents of this directory are all deleted.
* @param context task context
* @return a path for temporary data.
*/
public abstract Path getTempTaskAttemptPath(TaskAttemptContext context);
/**
* Get the name of this committer.
* @return the committer name.
*/
public abstract String getName();
/**
* The Job UUID, as passed in or generated.
* @return the UUID for the job.
*/
@VisibleForTesting
public final String getUUID() {
return uuid;
}
/**
* Source of the UUID.
* @return how the job UUID was retrieved/generated.
*/
@VisibleForTesting
public final JobUUIDSource getUUIDSource() {
return uuidSource;
}
@Override
public String toString() {
final StringBuilder sb = new StringBuilder(
"AbstractS3ACommitter{");
sb.append("role=").append(role);
sb.append(", name=").append(getName());
sb.append(", outputPath=").append(getOutputPath());
sb.append(", workPath=").append(workPath);
sb.append(", uuid='").append(getUUID()).append('\'');
sb.append(", uuid source=").append(getUUIDSource());
sb.append('}');
return sb.toString();
}
/**
* Get the destination filesystem from the output path and the configuration.
* @param out output path
* @param config job/task config
* @return the associated FS
* @throws PathCommitException output path isn't to an S3A FS instance.
* @throws IOException failure to instantiate the FS.
*/
protected FileSystem getDestinationFS(Path out, Configuration config)
throws IOException {
return getS3AFileSystem(out, config,
requiresDelayedCommitOutputInFileSystem());
}
/**
* Flag to indicate whether or not the destination filesystem needs
* to be configured to support magic paths where the output isn't immediately
* visible. If the committer returns true, then committer setup will
* fail if the FS doesn't have the capability.
* Base implementation returns false.
* @return what the requirements of the committer are of the filesystem.
*/
protected boolean requiresDelayedCommitOutputInFileSystem() {
return false;
}
/**
* Task recovery considered unsupported: Warn and fail.
* @param taskContext Context of the task whose output is being recovered
* @throws IOException always.
*/
@Override
public void recoverTask(TaskAttemptContext taskContext) throws IOException {
LOG.warn("Cannot recover task {}", taskContext.getTaskAttemptID());
throw new PathCommitException(outputPath,
String.format("Unable to recover task %s",
taskContext.getTaskAttemptID()));
}
/**
* if the job requires a success marker on a successful job,
* create the file {@link CommitConstants#_SUCCESS}.
*
* While the classic committers create a 0-byte file, the S3Guard committers
* PUT up a the contents of a {@link SuccessData} file.
* @param context job context
* @param pending the pending commits
* @throws IOException IO failure
*/
protected void maybeCreateSuccessMarkerFromCommits(JobContext context,
ActiveCommit pending) throws IOException {
List filenames = new ArrayList<>(pending.size());
// The list of committed objects in pending is size limited in
// ActiveCommit.uploadCommitted.
filenames.addAll(pending.committedObjects);
// load in all the pending statistics
IOStatisticsSnapshot snapshot = new IOStatisticsSnapshot(
pending.getIOStatistics());
snapshot.aggregate(getIOStatistics());
maybeCreateSuccessMarker(context, filenames, snapshot);
}
/**
* if the job requires a success marker on a successful job,
* create the file {@link CommitConstants#_SUCCESS}.
*
* While the classic committers create a 0-byte file, the S3Guard committers
* PUT up a the contents of a {@link SuccessData} file.
* @param context job context
* @param filenames list of filenames.
* @param ioStatistics any IO Statistics to include
* @throws IOException IO failure
*/
protected void maybeCreateSuccessMarker(JobContext context,
List filenames,
final IOStatisticsSnapshot ioStatistics)
throws IOException {
if (createJobMarker) {
// create a success data structure and then save it
SuccessData successData = new SuccessData();
successData.setCommitter(getName());
successData.setJobId(uuid);
successData.setJobIdSource(uuidSource.getText());
successData.setDescription(getRole());
successData.setHostname(NetUtils.getLocalHostname());
Date now = new Date();
successData.setTimestamp(now.getTime());
successData.setDate(now.toString());
successData.setFilenames(filenames);
successData.getIOStatistics().aggregate(ioStatistics);
commitOperations.createSuccessMarker(getOutputPath(), successData, true);
}
}
/**
* Base job setup (optionally) deletes the success marker and
* always creates the destination directory.
* When objects are committed that dest dir marker will inevitably
* be deleted; creating it now ensures there is something at the end
* while the job is in progress -and if nothing is created, that
* it is still there.
*
* The option {@link InternalCommitterConstants#FS_S3A_COMMITTER_UUID}
* is set to the job UUID; if generated locally
* {@link InternalCommitterConstants#SPARK_WRITE_UUID} is also patched.
* The field {@link #jobSetup} is set to true to note that
* this specific committer instance was used to set up a job.
*
* @param context context
* @throws IOException IO failure
*/
@Override
public void setupJob(JobContext context) throws IOException {
try (DurationInfo d = new DurationInfo(LOG,
"Job %s setting up", getUUID())) {
// record that the job has been set up
jobSetup = true;
// patch job conf with the job UUID.
Configuration c = context.getConfiguration();
c.set(FS_S3A_COMMITTER_UUID, getUUID());
c.set(FS_S3A_COMMITTER_UUID_SOURCE, getUUIDSource().getText());
Path dest = getOutputPath();
if (createJobMarker){
commitOperations.deleteSuccessMarker(dest);
}
getDestFS().mkdirs(dest);
// do a scan for surplus markers
warnOnActiveUploads(dest);
}
}
/**
* Task setup. Fails if the the UUID was generated locally, and
* the same committer wasn't used for job setup.
* {@inheritDoc}
* @throws PathCommitException if the task UUID options are unsatisfied.
*/
@Override
public void setupTask(TaskAttemptContext context) throws IOException {
TaskAttemptID attemptID = context.getTaskAttemptID();
try (DurationInfo d = new DurationInfo(LOG, "Setup Task %s",
attemptID)) {
// reject attempts to set up the task where the output won't be
// picked up
if (!jobSetup
&& getUUIDSource() == JobUUIDSource.GeneratedLocally) {
// on anything other than a test run, the context must not have been
// generated locally.
throw new PathCommitException(getOutputPath().toString(),
"Task attempt " + attemptID
+ " " + E_SELF_GENERATED_JOB_UUID);
}
Path taskAttemptPath = getTaskAttemptPath(context);
FileSystem fs = taskAttemptPath.getFileSystem(getConf());
fs.mkdirs(taskAttemptPath);
}
}
/**
* Get the task attempt path filesystem. This may not be the same as the
* final destination FS, and so may not be an S3A FS.
* @param context task attempt
* @return the filesystem
* @throws IOException failure to instantiate
*/
protected FileSystem getTaskAttemptFilesystem(TaskAttemptContext context)
throws IOException {
return getTaskAttemptPath(context).getFileSystem(getConf());
}
/**
* Commit all the pending uploads.
* Each file listed in the ActiveCommit instance is queued for processing
* in a separate thread; its contents are loaded and then (sequentially)
* committed.
* On a failure or abort of a single file's commit, all its uploads are
* aborted.
* The revert operation lists the files already committed and deletes them.
* @param context job context
* @param pending pending uploads
* @throws IOException on any failure
*/
protected void commitPendingUploads(
final JobContext context,
final ActiveCommit pending) throws IOException {
if (pending.isEmpty()) {
LOG.warn("{}: No pending uploads to commit", getRole());
}
try (DurationInfo ignored = new DurationInfo(LOG,
"committing the output of %s task(s)", pending.size());
CommitOperations.CommitContext commitContext
= initiateCommitOperation()) {
Tasks.foreach(pending.getSourceFiles())
.stopOnFailure()
.suppressExceptions(false)
.executeWith(buildSubmitter(context))
.abortWith(status ->
loadAndAbort(commitContext, pending, status, true, false))
.revertWith(status ->
loadAndRevert(commitContext, pending, status))
.run(status ->
loadAndCommit(commitContext, pending, status));
}
}
/**
* Run a precommit check that all files are loadable.
* This check avoids the situation where the inability to read
* a file only surfaces partway through the job commit, so
* results in the destination being tainted.
* @param context job context
* @param pending the pending operations
* @throws IOException any failure
*/
protected void precommitCheckPendingFiles(
final JobContext context,
final ActiveCommit pending) throws IOException {
FileSystem sourceFS = pending.getSourceFS();
try (DurationInfo ignored =
new DurationInfo(LOG, "Preflight Load of pending files")) {
Tasks.foreach(pending.getSourceFiles())
.stopOnFailure()
.suppressExceptions(false)
.executeWith(buildSubmitter(context))
.run(status -> PendingSet.load(sourceFS, status));
}
}
/**
* Load a pendingset file and commit all of its contents.
* @param commitContext context to commit through
* @param activeCommit commit state
* @param status file to load
* @throws IOException failure
*/
private void loadAndCommit(
final CommitOperations.CommitContext commitContext,
final ActiveCommit activeCommit,
final FileStatus status) throws IOException {
final Path path = status.getPath();
try (DurationInfo ignored =
new DurationInfo(LOG,
"Loading and committing files in pendingset %s", path)) {
PendingSet pendingSet = PendingSet.load(activeCommit.getSourceFS(),
status);
String jobId = pendingSet.getJobId();
if (!StringUtils.isEmpty(jobId) && !getUUID().equals(jobId)) {
throw new PathCommitException(path,
String.format("Mismatch in Job ID (%s) and commit job ID (%s)",
getUUID(), jobId));
}
Tasks.foreach(pendingSet.getCommits())
.stopOnFailure()
.suppressExceptions(false)
.executeWith(singleThreadSubmitter())
.onFailure((commit, exception) ->
commitContext.abortSingleCommit(commit))
.abortWith(commitContext::abortSingleCommit)
.revertWith(commitContext::revertCommit)
.run(commit -> {
commitContext.commitOrFail(commit);
activeCommit.uploadCommitted(
commit.getDestinationKey(), commit.getLength());
});
activeCommit.pendingsetCommitted(pendingSet.getIOStatistics());
}
}
/**
* Load a pendingset file and revert all of its contents.
* @param commitContext context to commit through
* @param activeCommit commit state
* @param status status of file to load
* @throws IOException failure
*/
private void loadAndRevert(
final CommitOperations.CommitContext commitContext,
final ActiveCommit activeCommit,
final FileStatus status) throws IOException {
final Path path = status.getPath();
try (DurationInfo ignored =
new DurationInfo(LOG, false, "Committing %s", path)) {
PendingSet pendingSet = PendingSet.load(activeCommit.getSourceFS(),
status);
Tasks.foreach(pendingSet.getCommits())
.suppressExceptions(true)
.run(commitContext::revertCommit);
}
}
/**
* Load a pendingset file and abort all of its contents.
* @param commitContext context to commit through
* @param activeCommit commit state
* @param status status of file to load
* @param deleteRemoteFiles should remote files be deleted?
* @throws IOException failure
*/
private void loadAndAbort(
final CommitOperations.CommitContext commitContext,
final ActiveCommit activeCommit,
final FileStatus status,
final boolean suppressExceptions,
final boolean deleteRemoteFiles) throws IOException {
final Path path = status.getPath();
try (DurationInfo ignored =
new DurationInfo(LOG, false, "Aborting %s", path)) {
PendingSet pendingSet = PendingSet.load(activeCommit.getSourceFS(),
status);
FileSystem fs = getDestFS();
Tasks.foreach(pendingSet.getCommits())
.executeWith(singleThreadSubmitter())
.suppressExceptions(suppressExceptions)
.run(commit -> {
try {
commitContext.abortSingleCommit(commit);
} catch (FileNotFoundException e) {
// Commit ID was not known; file may exist.
// delete it if instructed to do so.
if (deleteRemoteFiles) {
fs.delete(commit.destinationPath(), false);
}
}
});
}
}
/**
* Start the final commit/abort commit operations.
* @return a commit context through which the operations can be invoked.
* @throws IOException failure.
*/
protected CommitOperations.CommitContext initiateCommitOperation()
throws IOException {
return getCommitOperations().initiateCommitOperation(getOutputPath());
}
/**
* Internal Job commit operation: where the S3 requests are made
* (potentially in parallel).
* @param context job context
* @param pending pending commits
* @throws IOException any failure
*/
protected void commitJobInternal(JobContext context,
ActiveCommit pending)
throws IOException {
trackDurationOfInvocation(committerStatistics,
COMMITTER_COMMIT_JOB.getSymbol(),
() -> commitPendingUploads(context, pending));
}
@Override
public void abortJob(JobContext context, JobStatus.State state)
throws IOException {
LOG.info("{}: aborting job {} in state {}",
getRole(), jobIdString(context), state);
// final cleanup operations
abortJobInternal(context, false);
}
/**
* The internal job abort operation; can be overridden in tests.
* This must clean up operations; it is called when a commit fails, as
* well as in an {@link #abortJob(JobContext, JobStatus.State)} call.
* The base implementation calls {@link #cleanup(JobContext, boolean)}
* so cleans up the filesystems and destroys the thread pool.
* Subclasses must always invoke this superclass method after their
* own operations.
* @param context job context
* @param suppressExceptions should exceptions be suppressed?
* @throws IOException any IO problem raised when suppressExceptions is false.
*/
protected void abortJobInternal(JobContext context,
boolean suppressExceptions)
throws IOException {
cleanup(context, suppressExceptions);
}
/**
* Abort all pending uploads to the destination directory during
* job cleanup operations.
* Note: this instantiates the thread pool if required -so
* {@link #destroyThreadPool()} must be called after this.
* @param suppressExceptions should exceptions be suppressed
* @throws IOException IO problem
*/
protected void abortPendingUploadsInCleanup(
boolean suppressExceptions) throws IOException {
// return early if aborting is disabled.
if (!shouldAbortUploadsInCleanup()) {
LOG.debug("Not cleanup up pending uploads to {} as {} is false ",
getOutputPath(),
FS_S3A_COMMITTER_ABORT_PENDING_UPLOADS);
return;
}
Path dest = getOutputPath();
try (DurationInfo ignored =
new DurationInfo(LOG, "Aborting all pending commits under %s",
dest);
CommitOperations.CommitContext commitContext
= initiateCommitOperation()) {
CommitOperations ops = getCommitOperations();
List pending;
try {
pending = ops.listPendingUploadsUnderPath(dest);
} catch (IOException e) {
// raised if the listPendingUploads call failed.
maybeIgnore(suppressExceptions, "aborting pending uploads", e);
return;
}
if (!pending.isEmpty()) {
LOG.warn("{} pending uploads were found -aborting", pending.size());
LOG.warn("If other tasks/jobs are writing to {},"
+ "this action may cause them to fail", dest);
Tasks.foreach(pending)
.executeWith(buildSubmitter(getJobContext()))
.suppressExceptions(suppressExceptions)
.run(u -> commitContext.abortMultipartCommit(
u.getKey(), u.getUploadId()));
} else {
LOG.info("No pending uploads were found");
}
}
}
private boolean shouldAbortUploadsInCleanup() {
return getConf()
.getBoolean(FS_S3A_COMMITTER_ABORT_PENDING_UPLOADS,
DEFAULT_FS_S3A_COMMITTER_ABORT_PENDING_UPLOADS);
}
/**
* Subclass-specific pre-Job-commit actions.
* The staging committers all load the pending files to verify that
* they can be loaded.
* The Magic committer does not, because of the overhead of reading files
* from S3 makes it too expensive.
* @param context job context
* @param pending the pending operations
* @throws IOException any failure
*/
@VisibleForTesting
public void preCommitJob(JobContext context,
ActiveCommit pending) throws IOException {
}
/**
* Commit work.
* This consists of two stages: precommit and commit.
*
* Precommit: identify pending uploads, then allow subclasses
* to validate the state of the destination and the pending uploads.
* Any failure here triggers an abort of all pending uploads.
*
* Commit internal: do the final commit sequence.
*
* The final commit action is to build the {@code _SUCCESS} file entry.
*
* @param context job context
* @throws IOException any failure
*/
@Override
public void commitJob(JobContext context) throws IOException {
String id = jobIdString(context);
try (DurationInfo d = new DurationInfo(LOG,
"%s: commitJob(%s)", getRole(), id)) {
ActiveCommit pending
= listPendingUploadsToCommit(context);
preCommitJob(context, pending);
commitJobInternal(context, pending);
jobCompleted(true);
maybeCreateSuccessMarkerFromCommits(context, pending);
cleanup(context, false);
} catch (IOException e) {
LOG.warn("Commit failure for job {}", id, e);
jobCompleted(false);
abortJobInternal(context, true);
throw e;
}
}
/**
* Job completion outcome; this may be subclassed in tests.
* @param success did the job succeed.
*/
protected void jobCompleted(boolean success) {
getCommitOperations().jobCompleted(success);
}
/**
* Clean up any staging directories.
* IOEs must be caught and swallowed.
*/
public abstract void cleanupStagingDirs();
/**
* Get the list of pending uploads for this job attempt.
* @param context job context
* @return a list of pending uploads.
* @throws IOException Any IO failure
*/
protected abstract ActiveCommit listPendingUploadsToCommit(
JobContext context)
throws IOException;
/**
* Cleanup the job context, including aborting anything pending
* and destroying the thread pool.
* @param context job context
* @param suppressExceptions should exceptions be suppressed?
* @throws IOException any failure if exceptions were not suppressed.
*/
protected void cleanup(JobContext context,
boolean suppressExceptions) throws IOException {
try (DurationInfo d = new DurationInfo(LOG,
"Cleanup job %s", jobIdString(context))) {
abortPendingUploadsInCleanup(suppressExceptions);
} finally {
destroyThreadPool();
cleanupStagingDirs();
}
}
@Override
@SuppressWarnings("deprecation")
public void cleanupJob(JobContext context) throws IOException {
String r = getRole();
String id = jobIdString(context);
LOG.warn("{}: using deprecated cleanupJob call for {}", r, id);
try (DurationInfo d = new DurationInfo(LOG, "%s: cleanup Job %s", r, id)) {
cleanup(context, true);
}
}
/**
* Execute an operation; maybe suppress any raised IOException.
* @param suppress should raised IOEs be suppressed?
* @param action action (for logging when the IOE is supressed.
* @param operation operation
* @throws IOException if operation raised an IOE and suppress == false
*/
protected void maybeIgnore(
boolean suppress,
String action,
Invoker.VoidOperation operation) throws IOException {
if (suppress) {
ignoreIOExceptions(LOG, action, "", operation);
} else {
operation.execute();
}
}
/**
* Log or rethrow a caught IOException.
* @param suppress should raised IOEs be suppressed?
* @param action action (for logging when the IOE is suppressed.
* @param ex exception
* @throws IOException if suppress == false
*/
protected void maybeIgnore(
boolean suppress,
String action,
IOException ex) throws IOException {
if (suppress) {
LOG.debug(action, ex);
} else {
throw ex;
}
}
/**
* Get the commit actions instance.
* Subclasses may provide a mock version of this.
* @return the commit actions instance to use for operations.
*/
protected CommitOperations getCommitOperations() {
return commitOperations;
}
/**
* Used in logging and reporting to help disentangle messages.
* @return the committer's role.
*/
protected String getRole() {
return role;
}
/**
* Returns an {@link Tasks.Submitter} for parallel tasks. The number of
* threads in the thread-pool is set by fs.s3a.committer.threads.
* If num-threads is 0, this will return null;
* this is used in Tasks as a cue
* to switch to single-threaded execution.
*
* @param context the JobContext for this commit
* @return a submitter or null
*/
protected Tasks.Submitter buildSubmitter(
JobContext context) {
if (getThreadCount(context) > 0) {
return new PoolSubmitter(context);
} else {
return null;
}
}
/**
* Returns an {@link ExecutorService} for parallel tasks. The number of
* threads in the thread-pool is set by fs.s3a.committer.threads.
* If num-threads is 0, this will raise an exception.
*
* @param context the JobContext for this commit
* @param numThreads threads
* @return an {@link ExecutorService} for the number of threads
*/
private synchronized ExecutorService buildThreadPool(
JobContext context, int numThreads) {
Preconditions.checkArgument(numThreads > 0,
"Cannot create a thread pool with no threads");
if (threadPool == null) {
LOG.debug("{}: creating thread pool of size {}", getRole(), numThreads);
threadPool = HadoopExecutors.newFixedThreadPool(numThreads,
new ThreadFactoryBuilder()
.setDaemon(true)
.setNameFormat(THREAD_PREFIX + context.getJobID() + "-%d")
.build());
}
return threadPool;
}
/**
* Get the thread count for this job's commit operations.
* @param context the JobContext for this commit
* @return a possibly zero thread count.
*/
private int getThreadCount(final JobContext context) {
return context.getConfiguration().getInt(
FS_S3A_COMMITTER_THREADS,
DEFAULT_COMMITTER_THREADS);
}
/**
* Submit a runnable.
* This will demand-create the thread pool if needed.
*
* This is synchronized to ensure the thread pool is always valid when
* work is synchronized. See HADOOP-16798.
* @param context the JobContext for this commit
* @param task task to execute
* @return the future of the submitted task.
*/
private synchronized Future submitRunnable(
final JobContext context,
final Runnable task) {
return buildThreadPool(context, getThreadCount(context)).submit(task);
}
/**
* The real task submitter, which hands off the work to
* the current thread pool.
*/
private final class PoolSubmitter implements Tasks.Submitter {
private final JobContext context;
private final int numThreads;
private PoolSubmitter(final JobContext context) {
this.numThreads = getThreadCount(context);
Preconditions.checkArgument(numThreads > 0,
"Cannot create a thread pool with no threads");
this.context = context;
}
@Override
public Future submit(final Runnable task) {
return submitRunnable(context, task);
}
}
/**
* Destroy any thread pools; wait for that to finish,
* but don't overreact if it doesn't finish in time.
*/
protected void destroyThreadPool() {
ExecutorService pool;
// reset the thread pool in a sync block, then shut it down
// afterwards. This allows for other threads to create a
// new thread pool on demand.
synchronized(this) {
pool = this.threadPool;
threadPool = null;
}
if (pool != null) {
LOG.debug("Destroying thread pool");
HadoopExecutors.shutdown(pool, LOG,
THREAD_POOL_SHUTDOWN_DELAY_SECONDS, TimeUnit.SECONDS);
}
}
/**
* Get the thread pool for executing the single file commit/revert
* within the commit of all uploads of a single task.
* This is currently null; it is here to allow the Tasks class to
* provide the logic for execute/revert.
* @return null. always.
*/
protected final synchronized Tasks.Submitter singleThreadSubmitter() {
return null;
}
/**
* Does this committer have a thread pool?
* @return true if a thread pool exists.
*/
public synchronized boolean hasThreadPool() {
return threadPool != null;
}
/**
* Delete the task attempt path without raising any errors.
* @param context task context
*/
protected void deleteTaskAttemptPathQuietly(TaskAttemptContext context) {
Path attemptPath = getBaseTaskAttemptPath(context);
ignoreIOExceptions(LOG, "Delete task attempt path", attemptPath.toString(),
() -> deleteQuietly(
getTaskAttemptFilesystem(context), attemptPath, true));
}
/**
* Abort all pending uploads in the list.
* This operation is used by the magic committer as part of its
* rollback after a failure during task commit.
* @param context job context
* @param pending pending uploads
* @param suppressExceptions should exceptions be suppressed
* @throws IOException any exception raised
*/
protected void abortPendingUploads(JobContext context,
List pending,
boolean suppressExceptions)
throws IOException {
if (pending == null || pending.isEmpty()) {
LOG.info("{}: no pending commits to abort", getRole());
} else {
try (DurationInfo d = new DurationInfo(LOG,
"Aborting %s uploads", pending.size());
CommitOperations.CommitContext commitContext
= initiateCommitOperation()) {
Tasks.foreach(pending)
.executeWith(buildSubmitter(context))
.suppressExceptions(suppressExceptions)
.run(commitContext::abortSingleCommit);
}
}
}
/**
* Abort all pending uploads in the list.
* @param context job context
* @param pending pending uploads
* @param suppressExceptions should exceptions be suppressed?
* @param deleteRemoteFiles should remote files be deleted?
* @throws IOException any exception raised
*/
protected void abortPendingUploads(
final JobContext context,
final ActiveCommit pending,
final boolean suppressExceptions,
final boolean deleteRemoteFiles) throws IOException {
if (pending.isEmpty()) {
LOG.info("{}: no pending commits to abort", getRole());
} else {
try (DurationInfo d = new DurationInfo(LOG,
"Aborting %s uploads", pending.size());
CommitOperations.CommitContext commitContext
= initiateCommitOperation()) {
Tasks.foreach(pending.getSourceFiles())
.executeWith(buildSubmitter(context))
.suppressExceptions(suppressExceptions)
.run(path ->
loadAndAbort(commitContext,
pending,
path,
suppressExceptions,
deleteRemoteFiles));
}
}
}
@Override
public IOStatistics getIOStatistics() {
return committerStatistics.getIOStatistics();
}
/**
* Scan for active uploads and list them along with a warning message.
* Errors are ignored.
* @param path output path of job.
*/
protected void warnOnActiveUploads(final Path path) {
List pending;
try {
pending = getCommitOperations()
.listPendingUploadsUnderPath(path);
} catch (IOException e) {
LOG.debug("Failed to list uploads under {}",
path, e);
return;
}
if (!pending.isEmpty()) {
// log a warning
LOG.warn("{} active upload(s) in progress under {}",
pending.size(),
path);
LOG.warn("Either jobs are running concurrently"
+ " or failed jobs are not being cleaned up");
// and the paths + timestamps
DateFormat df = DateFormat.getDateTimeInstance();
pending.forEach(u ->
LOG.info("[{}] {}",
df.format(u.getInitiated()),
u.getKey()));
if (shouldAbortUploadsInCleanup()) {
LOG.warn("This committer will abort these uploads in job cleanup");
}
}
}
/**
* Build the job UUID.
*
*
* In MapReduce jobs, the application ID is issued by YARN, and
* unique across all jobs.
*
*
* Spark will use a fake app ID based on the current time.
* This can lead to collisions on busy clusters unless
* the specific spark release has SPARK-33402 applied.
* This appends a random long value to the timestamp, so
* is unique enough that the risk of collision is almost
* nonexistent.
*
*
* The order of selection of a uuid is
*
*
* - Value of
* {@link InternalCommitterConstants#FS_S3A_COMMITTER_UUID}.
* - Value of
* {@link InternalCommitterConstants#SPARK_WRITE_UUID}.
* - If enabled through
* {@link CommitConstants#FS_S3A_COMMITTER_GENERATE_UUID}:
* Self-generated uuid.
* - If {@link CommitConstants#FS_S3A_COMMITTER_REQUIRE_UUID}
* is not set: Application ID
*
* The UUID bonding takes place during construction;
* the staging committers use it to set up their wrapped
* committer to a path in the cluster FS which is unique to the
* job.
*
* In MapReduce jobs, the application ID is issued by YARN, and
* unique across all jobs.
*
* In {@link #setupJob(JobContext)} the job context's configuration
* will be patched
* be valid in all sequences where the job has been set up for the
* configuration passed in.
*
* If the option {@link CommitConstants#FS_S3A_COMMITTER_REQUIRE_UUID}
* is set, then an external UUID MUST be passed in.
* This can be used to verify that the spark engine is reliably setting
* unique IDs for staging.
*
* @param conf job/task configuration
* @param jobId job ID from YARN or spark.
* @return Job UUID and source of it.
* @throws PathCommitException no UUID was found and it was required
*/
public static Pair
buildJobUUID(Configuration conf, JobID jobId)
throws PathCommitException {
String jobUUID = conf.getTrimmed(FS_S3A_COMMITTER_UUID, "");
if (!jobUUID.isEmpty()) {
return Pair.of(jobUUID, JobUUIDSource.CommitterUUIDProperty);
}
// there is no job UUID.
// look for one from spark
jobUUID = conf.getTrimmed(SPARK_WRITE_UUID, "");
if (!jobUUID.isEmpty()) {
return Pair.of(jobUUID, JobUUIDSource.SparkWriteUUID);
}
// there is no UUID configuration in the job/task config
// Check the job hasn't declared a requirement for the UUID.
// This allows or fail-fast validation of Spark behavior.
if (conf.getBoolean(FS_S3A_COMMITTER_REQUIRE_UUID,
DEFAULT_S3A_COMMITTER_REQUIRE_UUID)) {
throw new PathCommitException("", E_NO_SPARK_UUID);
}
// see if the job can generate a random UUI`
if (conf.getBoolean(FS_S3A_COMMITTER_GENERATE_UUID,
DEFAULT_S3A_COMMITTER_GENERATE_UUID)) {
// generate a random UUID. This is OK for a job, for a task
// it means that the data may not get picked up.
String newId = UUID.randomUUID().toString();
LOG.warn("No job ID in configuration; generating a random ID: {}",
newId);
return Pair.of(newId, JobUUIDSource.GeneratedLocally);
}
// if no other option was supplied, return the job ID.
// This is exactly what MR jobs expect, but is not what
// Spark jobs can do as there is a risk of jobID collision.
return Pair.of(jobId.toString(), JobUUIDSource.JobID);
}
/**
* Enumeration of Job UUID source.
*/
public enum JobUUIDSource {
SparkWriteUUID(SPARK_WRITE_UUID),
CommitterUUIDProperty(FS_S3A_COMMITTER_UUID),
JobID("JobID"),
GeneratedLocally("Generated Locally");
private final String text;
JobUUIDSource(final String text) {
this.text = text;
}
/**
* Source for messages.
* @return text
*/
public String getText() {
return text;
}
@Override
public String toString() {
final StringBuilder sb = new StringBuilder(
"JobUUIDSource{");
sb.append("text='").append(text).append('\'');
sb.append('}');
return sb.toString();
}
}
/**
* State of the active commit operation.
*
* It contains a list of all pendingset files to load as the source
* of outstanding commits to complete/abort,
* and tracks the files uploaded.
*
* To avoid running out of heap by loading all the source files
* simultaneously:
*
* -
* The list of files to load is passed round but
* the contents are only loaded on demand.
*
* -
* The number of written files tracked for logging in
* the _SUCCESS file are limited to a small amount -enough
* for testing only.
*
*
*/
public static class ActiveCommit {
private static final AbstractS3ACommitter.ActiveCommit EMPTY
= new ActiveCommit(null, new ArrayList<>());
/** All pendingset files to iterate through. */
private final List sourceFiles;
/**
* Filesystem for the source files.
*/
private final FileSystem sourceFS;
/**
* List of committed objects; only built up until the commit limit is
* reached.
*/
private final List committedObjects = new ArrayList<>();
/**
* The total number of committed objects.
*/
private int committedObjectCount;
/**
* Total number of bytes committed.
*/
private long committedBytes;
/**
* Aggregate statistics of all supplied by
* committed uploads.
*/
private final IOStatisticsSnapshot ioStatistics =
new IOStatisticsSnapshot();
/**
* Construct from a source FS and list of files.
* @param sourceFS filesystem containing the list of pending files
* @param sourceFiles .pendingset files to load and commit.
*/
public ActiveCommit(
final FileSystem sourceFS,
final List sourceFiles) {
this.sourceFiles = (List) sourceFiles;
this.sourceFS = sourceFS;
}
/**
* Create an active commit of the given pending files.
* @param pendingFS source filesystem.
* @param statuses list of file status or subclass to use.
* @return the commit
*/
public static ActiveCommit fromStatusList(
final FileSystem pendingFS,
final List statuses) {
return new ActiveCommit(pendingFS, statuses);
}
/**
* Get the empty entry.
* @return an active commit with no pending files.
*/
public static ActiveCommit empty() {
return EMPTY;
}
public List getSourceFiles() {
return sourceFiles;
}
public FileSystem getSourceFS() {
return sourceFS;
}
/**
* Note that a file was committed.
* Increase the counter of files and total size.
* If there is room in the committedFiles list, the file
* will be added to the list and so end up in the _SUCCESS file.
* @param key key of the committed object.
* @param size size in bytes.
*/
public synchronized void uploadCommitted(String key,
long size) {
if (committedObjects.size() < SUCCESS_MARKER_FILE_LIMIT) {
committedObjects.add(
key.startsWith("/") ? key : ("/" + key));
}
committedObjectCount++;
committedBytes += size;
}
/**
* Callback when a pendingset has been committed,
* including any source statistics.
* @param sourceStatistics any source statistics
*/
public void pendingsetCommitted(final IOStatistics sourceStatistics) {
ioStatistics.aggregate(sourceStatistics);
}
public IOStatisticsSnapshot getIOStatistics() {
return ioStatistics;
}
public synchronized List getCommittedObjects() {
return committedObjects;
}
public synchronized int getCommittedFileCount() {
return committedObjectCount;
}
public synchronized long getCommittedBytes() {
return committedBytes;
}
public int size() {
return sourceFiles.size();
}
public boolean isEmpty() {
return sourceFiles.isEmpty();
}
public void add(FileStatus status) {
sourceFiles.add(status);
}
}
}