hadoop AbstractS3ACommitter 源码
haddop AbstractS3ACommitter 代码
文件路径：/hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/commit/AbstractS3ACommitter.java
/*
* 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 javax.annotation.Nullable;
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 com.amazonaws.services.s3.model.MultipartUpload;
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.classification.VisibleForTesting;
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.RemoteIterator;
import org.apache.hadoop.fs.audit.AuditConstants;
import org.apache.hadoop.fs.statistics.IOStatisticsContext;
import org.apache.hadoop.fs.store.audit.AuditSpan;
import org.apache.hadoop.fs.store.audit.AuditSpanSource;
import org.apache.hadoop.fs.s3a.S3AFileSystem;
import org.apache.hadoop.fs.s3a.commit.files.PendingSet;
import org.apache.hadoop.fs.s3a.commit.files.PersistentCommitData;
import org.apache.hadoop.fs.s3a.commit.files.SinglePendingCommit;
import org.apache.hadoop.fs.s3a.commit.files.SuccessData;
import org.apache.hadoop.fs.s3a.commit.impl.AuditContextUpdater;
import org.apache.hadoop.fs.s3a.commit.impl.CommitContext;
import org.apache.hadoop.fs.s3a.commit.impl.CommitOperations;
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.mapreduce.lib.output.committer.manifest.impl.ManifestStoreOperations;
import org.apache.hadoop.mapreduce.lib.output.committer.manifest.impl.ManifestStoreOperationsThroughFileSystem;
import org.apache.hadoop.net.NetUtils;
import org.apache.hadoop.util.DurationInfo;
import org.apache.hadoop.util.functional.InvocationRaisingIOE;
import org.apache.hadoop.util.functional.TaskPool;
import static java.util.Objects.requireNonNull;
import static org.apache.hadoop.fs.s3a.Constants.DEFAULT_MAXIMUM_CONNECTIONS;
import static org.apache.hadoop.fs.s3a.Constants.DEFAULT_MAX_TOTAL_TASKS;
import static org.apache.hadoop.fs.s3a.Constants.MAXIMUM_CONNECTIONS;
import static org.apache.hadoop.fs.s3a.Constants.MAX_TOTAL_TASKS;
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.audit.CommonAuditContext.currentAuditContext;
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.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.s3a.commit.impl.CommitUtilsWithMR.*;
import static org.apache.hadoop.fs.statistics.impl.IOStatisticsBinding.trackDurationOfInvocation;
import static org.apache.hadoop.mapreduce.lib.output.committer.manifest.files.DiagnosticKeys.STAGE;
import static org.apache.hadoop.mapreduce.lib.output.committer.manifest.impl.ManifestCommitterSupport.createJobSummaryFilename;
import static org.apache.hadoop.util.functional.RemoteIterators.toList;
/**
* 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, <i>and</i> 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;
/** 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.
* <i>This may not be on the final file system</i>
*/
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;
/**
* Source of Audit spans.
*/
private final AuditSpanSource auditSpanSource;
/**
* 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);
setOutputPath(outputPath);
this.jobContext = requireNonNull(context, "null job context");
this.role = "Task committer " + context.getTaskAttemptID();
setConf(context.getConfiguration());
Pair<String, JobUUIDSource> 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();
// set this thread's context with the job ID.
// audit spans created in this thread will pick
// up this value., including the commit operations instance
// soon to be created.
new AuditContextUpdater(jobContext)
.updateCurrentAuditContext();
// the filesystem is the span source, always.
this.auditSpanSource = fs.getAuditSpanSource();
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,
outputPath.toString());
}
/**
* 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) {
this.outputPath = requireNonNull(outputPath, "Null output path");
}
/**
* 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 under which all job attempts will be placed.
* @return the path to store job attempt data.
*/
protected abstract Path getJobPath();
/**
* 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 S3A committers
* PUT up a the contents of a {@link SuccessData} file.
* @param commitContext commit context
* @param pending the pending commits
*
* @return the success data, even if the marker wasn't created
*
* @throws IOException IO failure
*/
protected SuccessData maybeCreateSuccessMarkerFromCommits(
final CommitContext commitContext,
ActiveCommit pending) throws IOException {
List<String> 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());
// and the current statistics
snapshot.aggregate(getIOStatistics());
// and include the context statistics if enabled
if (commitContext.isCollectIOStatistics()) {
snapshot.aggregate(commitContext.getIOStatisticsContext()
.getIOStatistics());
}
return maybeCreateSuccessMarker(commitContext.getJobContext(), filenames, snapshot);
}
/**
* if the job requires a success marker on a successful job,
* create the {@code _SUCCESS} file.
*
* While the classic committers create a 0-byte file, the S3A committers
* PUT up a the contents of a {@link SuccessData} file.
* The file is returned, even if no marker is created.
* This is so it can be saved to a report directory.
* @param context job context
* @param filenames list of filenames.
* @param ioStatistics any IO Statistics to include
* @throws IOException IO failure
* @return the success data.
*/
protected SuccessData maybeCreateSuccessMarker(
final JobContext context,
final List<String> filenames,
final IOStatisticsSnapshot ioStatistics)
throws IOException {
SuccessData successData =
createSuccessData(context, filenames, ioStatistics,
getDestFS().getConf());
if (createJobMarker) {
// save it to the job dest dir
commitOperations.createSuccessMarker(getOutputPath(), successData, true);
}
return successData;
}
/**
* Create the success data structure from a job context.
* @param context job context.
* @param filenames short list of filenames; nullable
* @param ioStatistics IOStatistics snapshot
* @param destConf config of the dest fs, can be null
* @return the structure
*
*/
private SuccessData createSuccessData(final JobContext context,
final List<String> filenames,
final IOStatisticsSnapshot ioStatistics,
final Configuration destConf) {
// create a success data structure
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());
if (filenames != null) {
successData.setFilenames(filenames);
}
successData.getIOStatistics().aggregate(ioStatistics);
// attach some config options as diagnostics to assist
// in debugging performance issues.
// commit thread pool size
successData.addDiagnostic(FS_S3A_COMMITTER_THREADS,
Integer.toString(getJobCommitThreadCount(context)));
// and filesystem http connection and thread pool sizes
if (destConf != null) {
successData.addDiagnostic(MAXIMUM_CONNECTIONS,
destConf.get(MAXIMUM_CONNECTIONS,
Integer.toString(DEFAULT_MAXIMUM_CONNECTIONS)));
successData.addDiagnostic(MAX_TOTAL_TASKS,
destConf.get(MAX_TOTAL_TASKS,
Integer.toString(DEFAULT_MAX_TOTAL_TASKS)));
}
return successData;
}
/**
* 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.
* <p>
* 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.
* </p>
* @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();
// update the context so that task IO in the same thread has
// the relevant values.
new AuditContextUpdater(context)
.updateCurrentAuditContext();
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());
// delete that ta path if somehow it was there
fs.delete(taskAttemptPath, true);
// create an empty directory
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 commitContext commit context
* @param pending pending uploads
* @throws IOException on any failure
*/
protected void commitPendingUploads(
final CommitContext commitContext,
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())) {
TaskPool.foreach(pending.getSourceFiles())
.stopOnFailure()
.suppressExceptions(false)
.executeWith(commitContext.getOuterSubmitter())
.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 commitContext commit context
* @param pending the pending operations
* @throws IOException any failure
*/
protected void precommitCheckPendingFiles(
final CommitContext commitContext,
final ActiveCommit pending) throws IOException {
FileSystem sourceFS = pending.getSourceFS();
try (DurationInfo ignored =
new DurationInfo(LOG, "Preflight Load of pending files")) {
TaskPool.foreach(pending.getSourceFiles())
.stopOnFailure()
.suppressExceptions(false)
.executeWith(commitContext.getOuterSubmitter())
.run(status -> PersistentCommitData.load(sourceFS, status,
commitContext.getPendingSetSerializer()));
}
}
/**
* Load a pendingset file and commit all of its contents.
* Invoked within a parallel run; the commitContext thread
* pool is already busy/possibly full, so do not
* execute work through the same submitter.
* @param commitContext context to commit through
* @param activeCommit commit state
* @param status file to load
* @throws IOException failure
*/
private void loadAndCommit(
final CommitContext commitContext,
final ActiveCommit activeCommit,
final FileStatus status) throws IOException {
final Path path = status.getPath();
commitContext.switchToIOStatisticsContext();
try (DurationInfo ignored =
new DurationInfo(LOG,
"Loading and committing files in pendingset %s", path)) {
PendingSet pendingSet = PersistentCommitData.load(
activeCommit.getSourceFS(),
status,
commitContext.getPendingSetSerializer());
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));
}
TaskPool.foreach(pendingSet.getCommits())
.stopOnFailure()
.suppressExceptions(false)
.executeWith(commitContext.getInnerSubmitter())
.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.
* Invoked within a parallel run; the commitContext thread
* pool is already busy/possibly full, so do not
* execute work through the same submitter.
* @param commitContext context to commit through
* @param activeCommit commit state
* @param status status of file to load
* @throws IOException failure
*/
private void loadAndRevert(
final CommitContext commitContext,
final ActiveCommit activeCommit,
final FileStatus status) throws IOException {
final Path path = status.getPath();
commitContext.switchToIOStatisticsContext();
try (DurationInfo ignored =
new DurationInfo(LOG, false, "Committing %s", path)) {
PendingSet pendingSet = PersistentCommitData.load(
activeCommit.getSourceFS(),
status,
commitContext.getPendingSetSerializer());
TaskPool.foreach(pendingSet.getCommits())
.suppressExceptions(true)
.run(commitContext::revertCommit);
}
}
/**
* Load a pendingset file and abort all of its contents.
* Invoked within a parallel run; the commitContext thread
* pool is already busy/possibly full, so do not
* execute work through the same submitter.
* @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 CommitContext commitContext,
final ActiveCommit activeCommit,
final FileStatus status,
final boolean suppressExceptions,
final boolean deleteRemoteFiles) throws IOException {
final Path path = status.getPath();
commitContext.switchToIOStatisticsContext();
try (DurationInfo ignored =
new DurationInfo(LOG, false, "Aborting %s", path)) {
PendingSet pendingSet = PersistentCommitData.load(
activeCommit.getSourceFS(),
status,
commitContext.getPendingSetSerializer());
FileSystem fs = getDestFS();
TaskPool.foreach(pendingSet.getCommits())
.executeWith(commitContext.getInnerSubmitter())
.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 job commit/abort commit operations.
* If configured to collect statistics,
* The IO StatisticsContext is reset.
* @param context job context
* @return a commit context through which the operations can be invoked.
* @throws IOException failure.
*/
protected CommitContext initiateJobOperation(
final JobContext context)
throws IOException {
IOStatisticsContext ioStatisticsContext =
IOStatisticsContext.getCurrentIOStatisticsContext();
CommitContext commitContext = getCommitOperations().createCommitContext(
context,
getOutputPath(),
getJobCommitThreadCount(context),
ioStatisticsContext);
commitContext.maybeResetIOStatisticsContext();
return commitContext;
}
/**
* Start a ask commit/abort commit operations.
* This may have a different thread count.
* If configured to collect statistics,
* The IO StatisticsContext is reset.
* @param context job or task context
* @return a commit context through which the operations can be invoked.
* @throws IOException failure.
*/
protected CommitContext initiateTaskOperation(
final JobContext context)
throws IOException {
CommitContext commitContext = getCommitOperations().createCommitContext(
context,
getOutputPath(),
getTaskCommitThreadCount(context),
IOStatisticsContext.getCurrentIOStatisticsContext());
commitContext.maybeResetIOStatisticsContext();
return commitContext;
}
/**
* Internal Job commit operation: where the S3 requests are made
* (potentially in parallel).
* @param commitContext commit context
* @param pending pending commits
* @throws IOException any failure
*/
protected void commitJobInternal(
final CommitContext commitContext,
final ActiveCommit pending)
throws IOException {
trackDurationOfInvocation(committerStatistics,
COMMITTER_COMMIT_JOB.getSymbol(),
() -> commitPendingUploads(commitContext, 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
try (CommitContext commitContext = initiateJobOperation(context)){
abortJobInternal(commitContext, 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(CommitContext, boolean)}
* so cleans up the filesystems and destroys the thread pool.
* Subclasses must always invoke this superclass method after their
* own operations.
* Creates and closes its own commit context.
*
* @param commitContext commit context
* @param suppressExceptions should exceptions be suppressed?
* @throws IOException any IO problem raised when suppressExceptions is false.
*/
protected void abortJobInternal(CommitContext commitContext,
boolean suppressExceptions)
throws IOException {
cleanup(commitContext, suppressExceptions);
}
/**
* Abort all pending uploads to the destination directory during
* job cleanup operations.
* Note: this instantiates the thread pool if required -so
* @param suppressExceptions should exceptions be suppressed
* @param commitContext commit context
* @throws IOException IO problem
*/
protected void abortPendingUploadsInCleanup(
boolean suppressExceptions,
CommitContext commitContext) 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 ops = getCommitOperations();
List<MultipartUpload> pending;
try {
pending = ops.listPendingUploadsUnderPath(dest);
} catch (IOException e) {
// Swallow any errors given this is best effort
LOG.debug("Failed to list pending uploads under {}", dest, 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);
TaskPool.foreach(pending)
.executeWith(commitContext.getOuterSubmitter())
.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 commitContext commit context
* @param pending the pending operations
* @throws IOException any failure
*/
@VisibleForTesting
public void preCommitJob(CommitContext commitContext,
ActiveCommit pending) throws IOException {
}
/**
* Commit work.
* This consists of two stages: precommit and commit.
* <p>
* 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.
* <p>
* Commit internal: do the final commit sequence.
* <p>
* The final commit action is to build the {@code _SUCCESS} file entry.
* </p>
* @param context job context
* @throws IOException any failure
*/
@Override
public void commitJob(JobContext context) throws IOException {
String id = jobIdString(context);
// the commit context is created outside a try-with-resources block
// so it can be used in exception handling.
CommitContext commitContext = null;
SuccessData successData = null;
IOException failure = null;
String stage = "preparing";
try (DurationInfo d = new DurationInfo(LOG,
"%s: commitJob(%s)", getRole(), id)) {
commitContext = initiateJobOperation(context);
ActiveCommit pending
= listPendingUploadsToCommit(commitContext);
stage = "precommit";
preCommitJob(commitContext, pending);
stage = "commit";
commitJobInternal(commitContext, pending);
stage = "completed";
jobCompleted(true);
stage = "marker";
successData = maybeCreateSuccessMarkerFromCommits(commitContext, pending);
stage = "cleanup";
cleanup(commitContext, false);
} catch (IOException e) {
// failure. record it for the summary
failure = e;
LOG.warn("Commit failure for job {}", id, e);
jobCompleted(false);
abortJobInternal(commitContext, true);
throw e;
} finally {
// save the report summary, even on failure
if (commitContext != null) {
if (successData == null) {
// if the commit did not get as far as creating success data, create one.
successData = createSuccessData(context, null, null,
getDestFS().getConf());
}
// save quietly, so no exceptions are raised
maybeSaveSummary(stage,
commitContext,
successData,
failure,
true,
true);
// and close that commit context
commitContext.close();
}
}
}
/**
* 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 commitContext commit context
* @return a list of pending uploads.
* @throws IOException Any IO failure
*/
protected abstract ActiveCommit listPendingUploadsToCommit(
CommitContext commitContext)
throws IOException;
/**
* Cleanup the job context, including aborting anything pending
* and destroying the thread pool.
* @param commitContext commit context
* @param suppressExceptions should exceptions be suppressed?
* @throws IOException any failure if exceptions were not suppressed.
*/
protected void cleanup(CommitContext commitContext,
boolean suppressExceptions) throws IOException {
try (DurationInfo d = new DurationInfo(LOG,
"Cleanup job %s", jobIdString(commitContext.getJobContext()))) {
abortPendingUploadsInCleanup(suppressExceptions, commitContext);
} finally {
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);
CommitContext commitContext = initiateJobOperation(context)) {
cleanup(commitContext, 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,
InvocationRaisingIOE operation) throws IOException {
if (suppress) {
ignoreIOExceptions(LOG, action, "", operation);
} else {
operation.apply();
}
}
/**
* 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;
}
/**
* 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 getJobCommitThreadCount(final JobContext context) {
return context.getConfiguration().getInt(
FS_S3A_COMMITTER_THREADS,
DEFAULT_COMMITTER_THREADS);
}
/**
* Get the thread count for this task's commit operations.
* @param context the JobContext for this commit
* @return a possibly zero thread count.
*/
private int getTaskCommitThreadCount(final JobContext context) {
return context.getConfiguration().getInt(
FS_S3A_COMMITTER_THREADS,
DEFAULT_COMMITTER_THREADS);
}
/**
* 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 commitContext commit context
* @param pending pending uploads
* @param suppressExceptions should exceptions be suppressed
* @throws IOException any exception raised
*/
protected void abortPendingUploads(
final CommitContext commitContext,
final List<SinglePendingCommit> pending,
final 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())) {
TaskPool.foreach(pending)
.executeWith(commitContext.getOuterSubmitter())
.suppressExceptions(suppressExceptions)
.run(commitContext::abortSingleCommit);
}
}
}
/**
* Abort all pending uploads in the list.
* @param commitContext commit 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 CommitContext commitContext,
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())) {
TaskPool.foreach(pending.getSourceFiles())
.executeWith(commitContext.getOuterSubmitter())
.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<MultipartUpload> 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.
*
* <p>
* In MapReduce jobs, the application ID is issued by YARN, and
* unique across all jobs.
* </p>
* <p>
* 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.
* </p>
* <p>
* The order of selection of a uuid is
* </p>
* <ol>
* <li>Value of
* {@link InternalCommitterConstants#FS_S3A_COMMITTER_UUID}.</li>
* <li>Value of
* {@link InternalCommitterConstants#SPARK_WRITE_UUID}.</li>
* <li>If enabled through
* {@link CommitConstants#FS_S3A_COMMITTER_GENERATE_UUID}:
* Self-generated uuid.</li>
* <li>If {@link CommitConstants#FS_S3A_COMMITTER_REQUIRE_UUID}
* is not set: Application ID</li>
* </ol>
* 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.
* <p>
* In MapReduce jobs, the application ID is issued by YARN, and
* unique across all jobs.
* </p>
* 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.
* <p>
* 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.
* </p>
* @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<String, JobUUIDSource>
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();
}
}
/**
* Add jobID to current context.
*/
protected final void updateCommonContext() {
currentAuditContext().put(AuditConstants.PARAM_JOB_ID, uuid);
}
protected AuditSpanSource getAuditSpanSource() {
return auditSpanSource;
}
/**
* Start an operation; retrieve an audit span.
*
* All operation names <i>SHOULD</i> come from
* {@code StoreStatisticNames} or
* {@code StreamStatisticNames}.
* @param name operation name.
* @param path1 first path of operation
* @param path2 second path of operation
* @return a span for the audit
* @throws IOException failure
*/
protected AuditSpan startOperation(String name,
@Nullable String path1,
@Nullable String path2)
throws IOException {
return getAuditSpanSource().createSpan(name, path1, path2);
}
/**
* Save a summary to the report dir if the config option
* is set.
* The report will be updated with the current active stage,
* and if {@code thrown} is non-null, it will be added to the
* diagnostics (and the job tagged as a failure).
* Static for testability.
* @param activeStage active stage
* @param context commit context.
* @param report summary file.
* @param thrown any exception indicting failure.
* @param quiet should exceptions be swallowed.
* @param overwrite should the existing file be overwritten
* @return the path of a file, if successfully saved
* @throws IOException if a failure occured and quiet==false
*/
private static Path maybeSaveSummary(
String activeStage,
CommitContext context,
SuccessData report,
Throwable thrown,
boolean quiet,
boolean overwrite) throws IOException {
Configuration conf = context.getConf();
String reportDir = conf.getTrimmed(OPT_SUMMARY_REPORT_DIR, "");
if (reportDir.isEmpty()) {
LOG.debug("No summary directory set in " + OPT_SUMMARY_REPORT_DIR);
return null;
}
LOG.debug("Summary directory set to {}", reportDir);
Path reportDirPath = new Path(reportDir);
Path path = new Path(reportDirPath,
createJobSummaryFilename(context.getJobId()));
if (thrown != null) {
report.recordJobFailure(thrown);
}
report.putDiagnostic(STAGE, activeStage);
// the store operations here is explicitly created for the FS where
// the reports go, which may not be the target FS of the job.
final FileSystem fs = path.getFileSystem(conf);
try (ManifestStoreOperations operations = new ManifestStoreOperationsThroughFileSystem(
fs)) {
if (!overwrite) {
// check for file existence so there is no need to worry about
// precisely what exception is raised when overwrite=false and dest file
// exists
try {
FileStatus st = operations.getFileStatus(path);
// get here and the file exists
LOG.debug("Report already exists: {}", st);
return null;
} catch (FileNotFoundException ignored) {
}
}
report.save(fs, path, SuccessData.serializer());
LOG.info("Job summary saved to {}", path);
return path;
} catch (IOException e) {
LOG.debug("Failed to save summary to {}", path, e);
if (quiet) {
return null;
} else {
throw e;
}
}
}
/**
* 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:
* <ol>
* <li>
* The list of files to load is passed round but
* the contents are only loaded on demand.
* </li>
* <li>
* The number of written files tracked for logging in
* the _SUCCESS file are limited to a small amount -enough
* for testing only.
* </li>
* </ol>
*/
public static final class ActiveCommit {
private static final AbstractS3ACommitter.ActiveCommit EMPTY
= new ActiveCommit(null, new ArrayList<>());
/** All pendingset files to iterate through. */
private final List<FileStatus> 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<String> 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.
*/
@SuppressWarnings("unchecked")
public ActiveCommit(
final FileSystem sourceFS,
final List<? extends FileStatus> sourceFiles) {
this.sourceFiles = (List<FileStatus>) sourceFiles;
this.sourceFS = sourceFS;
}
/**
* Create an active commit of the given pending files.
* @param pendingFS source filesystem.
* @param statuses iterator of file status or subclass to use.
* @return the commit
* @throws IOException if the iterator raises one.
*/
public static ActiveCommit fromStatusIterator(
final FileSystem pendingFS,
final RemoteIterator<? extends FileStatus> statuses) throws IOException {
return new ActiveCommit(pendingFS, toList(statuses));
}
/**
* Get the empty entry.
* @return an active commit with no pending files.
*/
public static ActiveCommit empty() {
return EMPTY;
}
public List<FileStatus> 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<String> 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);
}
}
}
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