/**
* 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.mapreduce.v2.hs;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.SortedMap;
import java.util.TreeMap;
import java.util.concurrent.ConcurrentSkipListMap;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FileAlreadyExistsException;
import org.apache.hadoop.fs.FileContext;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.Options;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.PathFilter;
import org.apache.hadoop.fs.RemoteIterator;
import org.apache.hadoop.fs.permission.FsPermission;
import org.apache.hadoop.mapred.JobACLsManager;
import org.apache.hadoop.mapreduce.jobhistory.JobSummary;
import org.apache.hadoop.mapreduce.v2.api.records.JobId;
import org.apache.hadoop.mapreduce.v2.app.job.Job;
import org.apache.hadoop.mapreduce.v2.jobhistory.FileNameIndexUtils;
import org.apache.hadoop.mapreduce.v2.jobhistory.JHAdminConfig;
import org.apache.hadoop.mapreduce.v2.jobhistory.JobHistoryUtils;
import org.apache.hadoop.mapreduce.v2.jobhistory.JobIndexInfo;
import org.apache.hadoop.yarn.YarnException;
import org.apache.hadoop.yarn.service.AbstractService;
import com.google.common.util.concurrent.ThreadFactoryBuilder;
/**
* This class provides a way to interact with history files in a thread safe
* manor.
*/
@InterfaceAudience.Public
@InterfaceStability.Unstable
public class HistoryFileManager extends AbstractService {
private static final Log LOG = LogFactory.getLog(HistoryFileManager.class);
private static final Log SUMMARY_LOG = LogFactory.getLog(JobSummary.class);
private static enum HistoryInfoState {
IN_INTERMEDIATE, IN_DONE, DELETED, MOVE_FAILED
};
private static String DONE_BEFORE_SERIAL_TAIL = JobHistoryUtils
.doneSubdirsBeforeSerialTail();
/**
* Maps between a serial number (generated based on jobId) and the timestamp
* component(s) to which it belongs. Facilitates jobId based searches. If a
* jobId is not found in this list - it will not be found.
*/
private static class SerialNumberIndex {
private SortedMap<String, Set<String>> cache;
private int maxSize;
public SerialNumberIndex(int maxSize) {
this.cache = new TreeMap<String, Set<String>>();
this.maxSize = maxSize;
}
public synchronized void add(String serialPart, String timestampPart) {
if (!cache.containsKey(serialPart)) {
cache.put(serialPart, new HashSet<String>());
if (cache.size() > maxSize) {
String key = cache.firstKey();
LOG.error("Dropping " + key
+ " from the SerialNumberIndex. We will no "
+ "longer be able to see jobs that are in that serial index for "
+ cache.get(key));
cache.remove(key);
}
}
Set<String> datePartSet = cache.get(serialPart);
datePartSet.add(timestampPart);
}
public synchronized void remove(String serialPart, String timeStampPart) {
if (cache.containsKey(serialPart)) {
Set<String> set = cache.get(serialPart);
set.remove(timeStampPart);
if (set.isEmpty()) {
cache.remove(serialPart);
}
}
}
public synchronized Set<String> get(String serialPart) {
Set<String> found = cache.get(serialPart);
if (found != null) {
return new HashSet<String>(found);
}
return null;
}
}
private static class JobListCache {
private ConcurrentSkipListMap<JobId, HistoryFileInfo> cache;
private int maxSize;
private long maxAge;
public JobListCache(int maxSize, long maxAge) {
this.maxSize = maxSize;
this.maxAge = maxAge;
this.cache = new ConcurrentSkipListMap<JobId, HistoryFileInfo>();
}
public HistoryFileInfo addIfAbsent(HistoryFileInfo fileInfo) {
JobId jobId = fileInfo.getJobIndexInfo().getJobId();
if (LOG.isDebugEnabled()) {
LOG.debug("Adding " + jobId + " to job list cache with "
+ fileInfo.getJobIndexInfo());
}
HistoryFileInfo old = cache.putIfAbsent(jobId, fileInfo);
if (cache.size() > maxSize) {
//There is a race here, where more then one thread could be trying to
// remove entries. This could result in too many entries being removed
// from the cache. This is considered OK as the size of the cache
// should be rather large, and we would rather have performance over
// keeping the cache size exactly at the maximum.
Iterator<JobId> keys = cache.navigableKeySet().iterator();
long cutoff = System.currentTimeMillis() - maxAge;
while(cache.size() > maxSize && keys.hasNext()) {
JobId key = keys.next();
HistoryFileInfo firstValue = cache.get(key);
if(firstValue != null) {
synchronized(firstValue) {
if (firstValue.isMovePending()) {
if(firstValue.didMoveFail() &&
firstValue.jobIndexInfo.getFinishTime() <= cutoff) {
cache.remove(key);
//Now lets try to delete it
try {
firstValue.delete();
} catch (IOException e) {
LOG.error("Error while trying to delete history files" +
" that could not be moved to done.", e);
}
} else {
LOG.warn("Waiting to remove " + key
+ " from JobListCache because it is not in done yet.");
}
} else {
cache.remove(key);
}
}
}
}
}
return old;
}
public void delete(HistoryFileInfo fileInfo) {
cache.remove(fileInfo.getJobId());
}
public Collection<HistoryFileInfo> values() {
return new ArrayList<HistoryFileInfo>(cache.values());
}
public HistoryFileInfo get(JobId jobId) {
return cache.get(jobId);
}
}
public class HistoryFileInfo {
private Path historyFile;
private Path confFile;
private Path summaryFile;
private JobIndexInfo jobIndexInfo;
private HistoryInfoState state;
private HistoryFileInfo(Path historyFile, Path confFile, Path summaryFile,
JobIndexInfo jobIndexInfo, boolean isInDone) {
this.historyFile = historyFile;
this.confFile = confFile;
this.summaryFile = summaryFile;
this.jobIndexInfo = jobIndexInfo;
state = isInDone ? HistoryInfoState.IN_DONE
: HistoryInfoState.IN_INTERMEDIATE;
}
private synchronized boolean isMovePending() {
return state == HistoryInfoState.IN_INTERMEDIATE
|| state == HistoryInfoState.MOVE_FAILED;
}
private synchronized boolean didMoveFail() {
return state == HistoryInfoState.MOVE_FAILED;
}
/**
* @return true if the files backed by this were deleted.
*/
public synchronized boolean isDeleted() {
return state == HistoryInfoState.DELETED;
}
private synchronized void moveToDone() throws IOException {
if (!isMovePending()) {
// It was either deleted or is already in done. Either way do nothing
return;
}
try {
long completeTime = jobIndexInfo.getFinishTime();
if (completeTime == 0) {
completeTime = System.currentTimeMillis();
}
JobId jobId = jobIndexInfo.getJobId();
List<Path> paths = new ArrayList<Path>(2);
if (historyFile == null) {
LOG.info("No file for job-history with " + jobId + " found in cache!");
} else {
paths.add(historyFile);
}
if (confFile == null) {
LOG.info("No file for jobConf with " + jobId + " found in cache!");
} else {
paths.add(confFile);
}
if (summaryFile == null) {
LOG.info("No summary file for job: " + jobId);
} else {
String jobSummaryString = getJobSummary(intermediateDoneDirFc,
summaryFile);
SUMMARY_LOG.info(jobSummaryString);
LOG.info("Deleting JobSummary file: [" + summaryFile + "]");
intermediateDoneDirFc.delete(summaryFile, false);
summaryFile = null;
}
Path targetDir = canonicalHistoryLogPath(jobId, completeTime);
addDirectoryToSerialNumberIndex(targetDir);
makeDoneSubdir(targetDir);
if (historyFile != null) {
Path toPath = doneDirFc.makeQualified(new Path(targetDir, historyFile
.getName()));
if (!toPath.equals(historyFile)) {
moveToDoneNow(historyFile, toPath);
historyFile = toPath;
}
}
if (confFile != null) {
Path toPath = doneDirFc.makeQualified(new Path(targetDir, confFile
.getName()));
if (!toPath.equals(confFile)) {
moveToDoneNow(confFile, toPath);
confFile = toPath;
}
}
state = HistoryInfoState.IN_DONE;
} catch (Throwable t) {
LOG.error("Error while trying to move a job to done", t);
this.state = HistoryInfoState.MOVE_FAILED;
}
}
/**
* Parse a job from the JobHistoryFile, if the underlying file is not going
* to be deleted.
*
* @return the Job or null if the underlying file was deleted.
* @throws IOException
* if there is an error trying to read the file.
*/
public synchronized Job loadJob() throws IOException {
return new CompletedJob(conf, jobIndexInfo.getJobId(), historyFile,
false, jobIndexInfo.getUser(), this, aclsMgr);
}
/**
* Return the history file. This should only be used for testing.
* @return the history file.
*/
synchronized Path getHistoryFile() {
return historyFile;
}
private synchronized void delete() throws IOException {
state = HistoryInfoState.DELETED;
doneDirFc.delete(doneDirFc.makeQualified(historyFile), false);
doneDirFc.delete(doneDirFc.makeQualified(confFile), false);
}
public JobIndexInfo getJobIndexInfo() {
return jobIndexInfo;
}
public JobId getJobId() {
return jobIndexInfo.getJobId();
}
public synchronized Path getConfFile() {
return confFile;
}
public synchronized Configuration loadConfFile() throws IOException {
FileContext fc = FileContext.getFileContext(confFile.toUri(), conf);
Configuration jobConf = new Configuration(false);
jobConf.addResource(fc.open(confFile));
return jobConf;
}
}
private SerialNumberIndex serialNumberIndex = null;
private JobListCache jobListCache = null;
// Maintains a list of known done subdirectories.
private final Set<Path> existingDoneSubdirs = Collections
.synchronizedSet(new HashSet<Path>());
/**
* Maintains a mapping between intermediate user directories and the last
* known modification time.
*/
private Map<String, Long> userDirModificationTimeMap = new HashMap<String, Long>();
private JobACLsManager aclsMgr;
private Configuration conf;
private boolean debugMode;
private String serialNumberFormat;
private Path doneDirPrefixPath = null; // folder for completed jobs
private FileContext doneDirFc; // done Dir FileContext
private Path intermediateDoneDirPath = null; // Intermediate Done Dir Path
private FileContext intermediateDoneDirFc; // Intermediate Done Dir
// FileContext
private ThreadPoolExecutor moveToDoneExecutor = null;
private long maxHistoryAge = 0;
public HistoryFileManager() {
super(HistoryFileManager.class.getName());
}
@Override
public void init(Configuration conf) {
this.conf = conf;
debugMode = conf.getBoolean(JHAdminConfig.MR_HISTORY_DEBUG_MODE, false);
int serialNumberLowDigits = debugMode ? 1 : 3;
serialNumberFormat = ("%0"
+ (JobHistoryUtils.SERIAL_NUMBER_DIRECTORY_DIGITS + serialNumberLowDigits)
+ "d");
String doneDirPrefix = null;
doneDirPrefix = JobHistoryUtils
.getConfiguredHistoryServerDoneDirPrefix(conf);
try {
doneDirPrefixPath = FileContext.getFileContext(conf).makeQualified(
new Path(doneDirPrefix));
doneDirFc = FileContext.getFileContext(doneDirPrefixPath.toUri(), conf);
mkdir(doneDirFc, doneDirPrefixPath, new FsPermission(
JobHistoryUtils.HISTORY_DONE_DIR_PERMISSION));
} catch (IOException e) {
throw new YarnException("Error creating done directory: ["
+ doneDirPrefixPath + "]", e);
}
String intermediateDoneDirPrefix = null;
intermediateDoneDirPrefix = JobHistoryUtils
.getConfiguredHistoryIntermediateDoneDirPrefix(conf);
try {
intermediateDoneDirPath = FileContext.getFileContext(conf).makeQualified(
new Path(intermediateDoneDirPrefix));
intermediateDoneDirFc = FileContext.getFileContext(
intermediateDoneDirPath.toUri(), conf);
mkdir(intermediateDoneDirFc, intermediateDoneDirPath, new FsPermission(
JobHistoryUtils.HISTORY_INTERMEDIATE_DONE_DIR_PERMISSIONS.toShort()));
} catch (IOException e) {
LOG.info("error creating done directory on dfs " + e);
throw new YarnException("Error creating intermediate done directory: ["
+ intermediateDoneDirPath + "]", e);
}
this.aclsMgr = new JobACLsManager(conf);
maxHistoryAge = conf.getLong(JHAdminConfig.MR_HISTORY_MAX_AGE_MS,
JHAdminConfig.DEFAULT_MR_HISTORY_MAX_AGE);
jobListCache = new JobListCache(conf.getInt(
JHAdminConfig.MR_HISTORY_JOBLIST_CACHE_SIZE,
JHAdminConfig.DEFAULT_MR_HISTORY_JOBLIST_CACHE_SIZE),
maxHistoryAge);
serialNumberIndex = new SerialNumberIndex(conf.getInt(
JHAdminConfig.MR_HISTORY_DATESTRING_CACHE_SIZE,
JHAdminConfig.DEFAULT_MR_HISTORY_DATESTRING_CACHE_SIZE));
int numMoveThreads = conf.getInt(
JHAdminConfig.MR_HISTORY_MOVE_THREAD_COUNT,
JHAdminConfig.DEFAULT_MR_HISTORY_MOVE_THREAD_COUNT);
ThreadFactory tf = new ThreadFactoryBuilder().setNameFormat(
"MoveIntermediateToDone Thread #%d").build();
moveToDoneExecutor = new ThreadPoolExecutor(numMoveThreads, numMoveThreads,
1, TimeUnit.HOURS, new LinkedBlockingQueue<Runnable>(), tf);
super.init(conf);
}
private void mkdir(FileContext fc, Path path, FsPermission fsp)
throws IOException {
if (!fc.util().exists(path)) {
try {
fc.mkdir(path, fsp, true);
FileStatus fsStatus = fc.getFileStatus(path);
LOG.info("Perms after creating " + fsStatus.getPermission().toShort()
+ ", Expected: " + fsp.toShort());
if (fsStatus.getPermission().toShort() != fsp.toShort()) {
LOG.info("Explicitly setting permissions to : " + fsp.toShort()
+ ", " + fsp);
fc.setPermission(path, fsp);
}
} catch (FileAlreadyExistsException e) {
LOG.info("Directory: [" + path + "] already exists.");
}
}
}
/**
* Populates index data structures. Should only be called at initialization
* times.
*/
@SuppressWarnings("unchecked")
void initExisting() throws IOException {
LOG.info("Initializing Existing Jobs...");
List<FileStatus> timestampedDirList = findTimestampedDirectories();
// Sort first just so insertion is in a consistent order
Collections.sort(timestampedDirList);
for (FileStatus fs : timestampedDirList) {
// TODO Could verify the correct format for these directories.
addDirectoryToSerialNumberIndex(fs.getPath());
addDirectoryToJobListCache(fs.getPath());
}
}
private void removeDirectoryFromSerialNumberIndex(Path serialDirPath) {
String serialPart = serialDirPath.getName();
String timeStampPart = JobHistoryUtils
.getTimestampPartFromPath(serialDirPath.toString());
if (timeStampPart == null) {
LOG.warn("Could not find timestamp portion from path: "
+ serialDirPath.toString() + ". Continuing with next");
return;
}
if (serialPart == null) {
LOG.warn("Could not find serial portion from path: "
+ serialDirPath.toString() + ". Continuing with next");
return;
}
serialNumberIndex.remove(serialPart, timeStampPart);
}
private void addDirectoryToSerialNumberIndex(Path serialDirPath) {
if (LOG.isDebugEnabled()) {
LOG.debug("Adding " + serialDirPath + " to serial index");
}
String serialPart = serialDirPath.getName();
String timestampPart = JobHistoryUtils
.getTimestampPartFromPath(serialDirPath.toString());
if (timestampPart == null) {
LOG.warn("Could not find timestamp portion from path: " + serialDirPath
+ ". Continuing with next");
return;
}
if (serialPart == null) {
LOG.warn("Could not find serial portion from path: "
+ serialDirPath.toString() + ". Continuing with next");
}
serialNumberIndex.add(serialPart, timestampPart);
}
private void addDirectoryToJobListCache(Path path) throws IOException {
if (LOG.isDebugEnabled()) {
LOG.debug("Adding " + path + " to job list cache.");
}
List<FileStatus> historyFileList = scanDirectoryForHistoryFiles(path,
doneDirFc);
for (FileStatus fs : historyFileList) {
if (LOG.isDebugEnabled()) {
LOG.debug("Adding in history for " + fs.getPath());
}
JobIndexInfo jobIndexInfo = FileNameIndexUtils.getIndexInfo(fs.getPath()
.getName());
String confFileName = JobHistoryUtils
.getIntermediateConfFileName(jobIndexInfo.getJobId());
String summaryFileName = JobHistoryUtils
.getIntermediateSummaryFileName(jobIndexInfo.getJobId());
HistoryFileInfo fileInfo = new HistoryFileInfo(fs.getPath(), new Path(fs
.getPath().getParent(), confFileName), new Path(fs.getPath()
.getParent(), summaryFileName), jobIndexInfo, true);
jobListCache.addIfAbsent(fileInfo);
}
}
private static List<FileStatus> scanDirectory(Path path, FileContext fc,
PathFilter pathFilter) throws IOException {
path = fc.makeQualified(path);
List<FileStatus> jhStatusList = new ArrayList<FileStatus>();
RemoteIterator<FileStatus> fileStatusIter = fc.listStatus(path);
while (fileStatusIter.hasNext()) {
FileStatus fileStatus = fileStatusIter.next();
Path filePath = fileStatus.getPath();
if (fileStatus.isFile() && pathFilter.accept(filePath)) {
jhStatusList.add(fileStatus);
}
}
return jhStatusList;
}
private static List<FileStatus> scanDirectoryForHistoryFiles(Path path,
FileContext fc) throws IOException {
return scanDirectory(path, fc, JobHistoryUtils.getHistoryFileFilter());
}
/**
* Finds all history directories with a timestamp component by scanning the
* filesystem. Used when the JobHistory server is started.
*
* @return
*/
private List<FileStatus> findTimestampedDirectories() throws IOException {
List<FileStatus> fsList = JobHistoryUtils.localGlobber(doneDirFc,
doneDirPrefixPath, DONE_BEFORE_SERIAL_TAIL);
return fsList;
}
/**
* Scans the intermediate directory to find user directories. Scans these for
* history files if the modification time for the directory has changed. Once
* it finds history files it starts the process of moving them to the done
* directory.
*
* @throws IOException
* if there was a error while scanning
*/
void scanIntermediateDirectory() throws IOException {
// TODO it would be great to limit how often this happens, except in the
// case where we are looking for a particular job.
List<FileStatus> userDirList = JobHistoryUtils.localGlobber(
intermediateDoneDirFc, intermediateDoneDirPath, "");
for (FileStatus userDir : userDirList) {
String name = userDir.getPath().getName();
long newModificationTime = userDir.getModificationTime();
boolean shouldScan = false;
synchronized (userDirModificationTimeMap) {
if (!userDirModificationTimeMap.containsKey(name)
|| newModificationTime > userDirModificationTimeMap.get(name)) {
shouldScan = true;
userDirModificationTimeMap.put(name, newModificationTime);
}
}
if (shouldScan) {
try {
scanIntermediateDirectory(userDir.getPath());
} catch (IOException e) {
LOG.error("Error while trying to scan the directory "
+ userDir.getPath(), e);
}
}
}
}
/**
* Scans the specified path and populates the intermediate cache.
*
* @param absPath
* @throws IOException
*/
private void scanIntermediateDirectory(final Path absPath) throws IOException {
List<FileStatus> fileStatusList = scanDirectoryForHistoryFiles(absPath,
intermediateDoneDirFc);
for (FileStatus fs : fileStatusList) {
JobIndexInfo jobIndexInfo = FileNameIndexUtils.getIndexInfo(fs.getPath()
.getName());
String confFileName = JobHistoryUtils
.getIntermediateConfFileName(jobIndexInfo.getJobId());
String summaryFileName = JobHistoryUtils
.getIntermediateSummaryFileName(jobIndexInfo.getJobId());
HistoryFileInfo fileInfo = new HistoryFileInfo(fs.getPath(), new Path(fs
.getPath().getParent(), confFileName), new Path(fs.getPath()
.getParent(), summaryFileName), jobIndexInfo, false);
final HistoryFileInfo old = jobListCache.addIfAbsent(fileInfo);
if (old == null || old.didMoveFail()) {
final HistoryFileInfo found = (old == null) ? fileInfo : old;
long cutoff = System.currentTimeMillis() - maxHistoryAge;
if(found.getJobIndexInfo().getFinishTime() <= cutoff) {
try {
found.delete();
} catch (IOException e) {
LOG.warn("Error cleaning up a HistoryFile that is out of date.", e);
}
} else {
moveToDoneExecutor.execute(new Runnable() {
@Override
public void run() {
try {
found.moveToDone();
} catch (IOException e) {
LOG.info("Failed to process fileInfo for job: " +
found.getJobId(), e);
}
}
});
}
}
}
}
/**
* Searches the job history file FileStatus list for the specified JobId.
*
* @param fileStatusList
* fileStatus list of Job History Files.
* @param jobId
* The JobId to find.
* @return A FileInfo object for the jobId, null if not found.
* @throws IOException
*/
private HistoryFileInfo getJobFileInfo(List<FileStatus> fileStatusList,
JobId jobId) throws IOException {
for (FileStatus fs : fileStatusList) {
JobIndexInfo jobIndexInfo = FileNameIndexUtils.getIndexInfo(fs.getPath()
.getName());
if (jobIndexInfo.getJobId().equals(jobId)) {
String confFileName = JobHistoryUtils
.getIntermediateConfFileName(jobIndexInfo.getJobId());
String summaryFileName = JobHistoryUtils
.getIntermediateSummaryFileName(jobIndexInfo.getJobId());
HistoryFileInfo fileInfo = new HistoryFileInfo(fs.getPath(), new Path(
fs.getPath().getParent(), confFileName), new Path(fs.getPath()
.getParent(), summaryFileName), jobIndexInfo, true);
return fileInfo;
}
}
return null;
}
/**
* Scans old directories known by the idToDateString map for the specified
* jobId. If the number of directories is higher than the supported size of
* the idToDateString cache, the jobId will not be found.
*
* @param jobId
* the jobId.
* @return
* @throws IOException
*/
private HistoryFileInfo scanOldDirsForJob(JobId jobId) throws IOException {
int jobSerialNumber = JobHistoryUtils.jobSerialNumber(jobId);
String boxedSerialNumber = String.valueOf(jobSerialNumber);
Set<String> dateStringSet = serialNumberIndex.get(boxedSerialNumber);
if (dateStringSet == null) {
return null;
}
for (String timestampPart : dateStringSet) {
Path logDir = canonicalHistoryLogPath(jobId, timestampPart);
List<FileStatus> fileStatusList = scanDirectoryForHistoryFiles(logDir,
doneDirFc);
HistoryFileInfo fileInfo = getJobFileInfo(fileStatusList, jobId);
if (fileInfo != null) {
return fileInfo;
}
}
return null;
}
public Collection<HistoryFileInfo> getAllFileInfo() throws IOException {
scanIntermediateDirectory();
return jobListCache.values();
}
public HistoryFileInfo getFileInfo(JobId jobId) throws IOException {
// FileInfo available in cache.
HistoryFileInfo fileInfo = jobListCache.get(jobId);
if (fileInfo != null) {
return fileInfo;
}
// OK so scan the intermediate to be sure we did not lose it that way
scanIntermediateDirectory();
fileInfo = jobListCache.get(jobId);
if (fileInfo != null) {
return fileInfo;
}
// Intermediate directory does not contain job. Search through older ones.
fileInfo = scanOldDirsForJob(jobId);
if (fileInfo != null) {
return fileInfo;
}
return null;
}
private void moveToDoneNow(final Path src, final Path target)
throws IOException {
LOG.info("Moving " + src.toString() + " to " + target.toString());
intermediateDoneDirFc.rename(src, target, Options.Rename.NONE);
}
private String getJobSummary(FileContext fc, Path path) throws IOException {
Path qPath = fc.makeQualified(path);
FSDataInputStream in = fc.open(qPath);
String jobSummaryString = in.readUTF();
in.close();
return jobSummaryString;
}
private void makeDoneSubdir(Path path) throws IOException {
try {
doneDirFc.getFileStatus(path);
existingDoneSubdirs.add(path);
} catch (FileNotFoundException fnfE) {
try {
FsPermission fsp = new FsPermission(
JobHistoryUtils.HISTORY_DONE_DIR_PERMISSION);
doneDirFc.mkdir(path, fsp, true);
FileStatus fsStatus = doneDirFc.getFileStatus(path);
LOG.info("Perms after creating " + fsStatus.getPermission().toShort()
+ ", Expected: " + fsp.toShort());
if (fsStatus.getPermission().toShort() != fsp.toShort()) {
LOG.info("Explicitly setting permissions to : " + fsp.toShort()
+ ", " + fsp);
doneDirFc.setPermission(path, fsp);
}
existingDoneSubdirs.add(path);
} catch (FileAlreadyExistsException faeE) { // Nothing to do.
}
}
}
private Path canonicalHistoryLogPath(JobId id, String timestampComponent) {
return new Path(doneDirPrefixPath, JobHistoryUtils.historyLogSubdirectory(
id, timestampComponent, serialNumberFormat));
}
private Path canonicalHistoryLogPath(JobId id, long millisecondTime) {
String timestampComponent = JobHistoryUtils.timestampDirectoryComponent(
millisecondTime, debugMode);
return new Path(doneDirPrefixPath, JobHistoryUtils.historyLogSubdirectory(
id, timestampComponent, serialNumberFormat));
}
private long getEffectiveTimestamp(long finishTime, FileStatus fileStatus) {
if (finishTime == 0) {
return fileStatus.getModificationTime();
}
return finishTime;
}
private void deleteJobFromDone(HistoryFileInfo fileInfo) throws IOException {
jobListCache.delete(fileInfo);
fileInfo.delete();
}
/**
* Clean up older history files.
*
* @throws IOException
* on any error trying to remove the entries.
*/
@SuppressWarnings("unchecked")
void clean() throws IOException {
// TODO this should be replaced by something that knows about the directory
// structure and will put less of a load on HDFS.
long cutoff = System.currentTimeMillis() - maxHistoryAge;
boolean halted = false;
// TODO Delete YYYY/MM/DD directories.
List<FileStatus> serialDirList = findTimestampedDirectories();
// Sort in ascending order. Relies on YYYY/MM/DD/Serial
Collections.sort(serialDirList);
for (FileStatus serialDir : serialDirList) {
List<FileStatus> historyFileList = scanDirectoryForHistoryFiles(
serialDir.getPath(), doneDirFc);
for (FileStatus historyFile : historyFileList) {
JobIndexInfo jobIndexInfo = FileNameIndexUtils.getIndexInfo(historyFile
.getPath().getName());
long effectiveTimestamp = getEffectiveTimestamp(
jobIndexInfo.getFinishTime(), historyFile);
if (effectiveTimestamp <= cutoff) {
HistoryFileInfo fileInfo = this.jobListCache.get(jobIndexInfo
.getJobId());
if (fileInfo == null) {
String confFileName = JobHistoryUtils
.getIntermediateConfFileName(jobIndexInfo.getJobId());
fileInfo = new HistoryFileInfo(historyFile.getPath(), new Path(
historyFile.getPath().getParent(), confFileName), null,
jobIndexInfo, true);
}
deleteJobFromDone(fileInfo);
} else {
halted = true;
break;
}
}
if (!halted) {
doneDirFc.delete(doneDirFc.makeQualified(serialDir.getPath()), true);
removeDirectoryFromSerialNumberIndex(serialDir.getPath());
existingDoneSubdirs.remove(serialDir.getPath());
} else {
break; // Don't scan any more directories.
}
}
}
}