hadoop LocalDirsHandlerService 源码
haddop LocalDirsHandlerService 代码
文件路径：/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/LocalDirsHandlerService.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.yarn.server.nodemanager;
import java.io.File;
import java.io.IOException;
import java.net.URI;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.Timer;
import java.util.TimerTask;
import org.apache.hadoop.classification.VisibleForTesting;
import org.apache.hadoop.service.AbstractService;
import org.apache.hadoop.util.DiskChecker.DiskErrorException;
import org.apache.hadoop.util.DiskValidator;
import org.apache.hadoop.util.DiskValidatorFactory;
import org.apache.hadoop.yarn.server.nodemanager.health.HealthReporter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.hadoop.classification.InterfaceAudience.Private;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileContext;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.LocalDirAllocator;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.permission.FsPermission;
import org.apache.hadoop.util.StringUtils;
import org.apache.hadoop.yarn.conf.YarnConfiguration;
import org.apache.hadoop.yarn.exceptions.YarnRuntimeException;
import org.apache.hadoop.yarn.server.nodemanager.DirectoryCollection.DirsChangeListener;
import org.apache.hadoop.yarn.server.nodemanager.metrics.NodeManagerMetrics;
/**
* The class which provides functionality of checking the health of the local
* directories of a node. This specifically manages nodemanager-local-dirs and
* nodemanager-log-dirs by periodically checking their health.
*/
public class LocalDirsHandlerService extends AbstractService
implements HealthReporter {
private static final Logger LOG =
LoggerFactory.getLogger(LocalDirsHandlerService.class);
private static final String diskCapacityExceededErrorMsg = "usable space is below configured utilization percentage/no more usable space";
/**
* Good local directories, use internally,
* initial value is the same as NM_LOCAL_DIRS.
*/
@Private
static final String NM_GOOD_LOCAL_DIRS =
YarnConfiguration.NM_PREFIX + "good-local-dirs";
/**
* Good log directories, use internally,
* initial value is the same as NM_LOG_DIRS.
*/
@Private
static final String NM_GOOD_LOG_DIRS =
YarnConfiguration.NM_PREFIX + "good-log-dirs";
/** Timer used to schedule disk health monitoring code execution */
private Timer dirsHandlerScheduler;
private long diskHealthCheckInterval;
private boolean isDiskHealthCheckerEnabled;
/**
* Minimum fraction of disks to be healthy for the node to be healthy in
* terms of disks. This applies to nm-local-dirs and nm-log-dirs.
*/
private float minNeededHealthyDisksFactor;
private MonitoringTimerTask monitoringTimerTask;
/** Local dirs to store localized files in */
private DirectoryCollection localDirs = null;
/** storage for container logs*/
private DirectoryCollection logDirs = null;
/**
* Everybody should go through this LocalDirAllocator object for read/write
* of any local path corresponding to {@link YarnConfiguration#NM_LOCAL_DIRS}
* instead of creating his/her own LocalDirAllocator objects
*/
private LocalDirAllocator localDirsAllocator;
/**
* Everybody should go through this LocalDirAllocator object for read/write
* of any local path corresponding to {@link YarnConfiguration#NM_LOG_DIRS}
* instead of creating his/her own LocalDirAllocator objects
*/
private LocalDirAllocator logDirsAllocator;
/** when disk health checking code was last run */
private long lastDisksCheckTime;
private static String FILE_SCHEME = "file";
private NodeManagerMetrics nodeManagerMetrics = null;
/**
* Class which is used by the {@link Timer} class to periodically execute the
* disks' health checker code.
*/
private final class MonitoringTimerTask extends TimerTask {
public MonitoringTimerTask(Configuration conf) throws YarnRuntimeException {
float highUsableSpacePercentagePerDisk =
conf.getFloat(
YarnConfiguration.NM_MAX_PER_DISK_UTILIZATION_PERCENTAGE,
YarnConfiguration.DEFAULT_NM_MAX_PER_DISK_UTILIZATION_PERCENTAGE);
float lowUsableSpacePercentagePerDisk =
conf.getFloat(
YarnConfiguration.NM_WM_LOW_PER_DISK_UTILIZATION_PERCENTAGE,
highUsableSpacePercentagePerDisk);
if (lowUsableSpacePercentagePerDisk > highUsableSpacePercentagePerDisk) {
LOG.warn("Using " + YarnConfiguration.
NM_MAX_PER_DISK_UTILIZATION_PERCENTAGE + " as " +
YarnConfiguration.NM_WM_LOW_PER_DISK_UTILIZATION_PERCENTAGE +
", because " + YarnConfiguration.
NM_WM_LOW_PER_DISK_UTILIZATION_PERCENTAGE +
" is not configured properly.");
lowUsableSpacePercentagePerDisk = highUsableSpacePercentagePerDisk;
}
long lowMinFreeSpacePerDiskMB =
conf.getLong(YarnConfiguration.NM_MIN_PER_DISK_FREE_SPACE_MB,
YarnConfiguration.DEFAULT_NM_MIN_PER_DISK_FREE_SPACE_MB);
long highMinFreeSpacePerDiskMB =
conf.getLong(YarnConfiguration.NM_WM_HIGH_PER_DISK_FREE_SPACE_MB,
lowMinFreeSpacePerDiskMB);
if (highMinFreeSpacePerDiskMB < lowMinFreeSpacePerDiskMB) {
LOG.warn("Using " + YarnConfiguration.
NM_MIN_PER_DISK_FREE_SPACE_MB + " as " +
YarnConfiguration.NM_WM_HIGH_PER_DISK_FREE_SPACE_MB +
", because " + YarnConfiguration.
NM_WM_HIGH_PER_DISK_FREE_SPACE_MB +
" is not configured properly.");
highMinFreeSpacePerDiskMB = lowMinFreeSpacePerDiskMB;
}
localDirs =
new DirectoryCollection(
validatePaths(conf
.getTrimmedStrings(YarnConfiguration.NM_LOCAL_DIRS)),
highUsableSpacePercentagePerDisk,
lowUsableSpacePercentagePerDisk,
lowMinFreeSpacePerDiskMB,
highMinFreeSpacePerDiskMB);
logDirs =
new DirectoryCollection(
validatePaths(conf
.getTrimmedStrings(YarnConfiguration.NM_LOG_DIRS)),
highUsableSpacePercentagePerDisk,
lowUsableSpacePercentagePerDisk,
lowMinFreeSpacePerDiskMB,
highMinFreeSpacePerDiskMB);
String local = conf.get(YarnConfiguration.NM_LOCAL_DIRS);
conf.set(NM_GOOD_LOCAL_DIRS,
(local != null) ? local : "");
String diskValidatorName = conf.get(YarnConfiguration.DISK_VALIDATOR,
YarnConfiguration.DEFAULT_DISK_VALIDATOR);
try {
DiskValidator diskValidator =
DiskValidatorFactory.getInstance(diskValidatorName);
localDirsAllocator = new LocalDirAllocator(
NM_GOOD_LOCAL_DIRS, diskValidator);
String log = conf.get(YarnConfiguration.NM_LOG_DIRS);
conf.set(NM_GOOD_LOG_DIRS,
(log != null) ? log : "");
logDirsAllocator = new LocalDirAllocator(
NM_GOOD_LOG_DIRS, diskValidator);
} catch (DiskErrorException e) {
throw new YarnRuntimeException(
"Failed to create DiskValidator of type " + diskValidatorName + "!",
e);
}
}
@Override
public void run() {
try {
checkDirs();
} catch (Throwable t) {
// Prevent uncaught exceptions from killing this thread
LOG.warn("Error while checking local directories: ", t);
}
}
}
public LocalDirsHandlerService() {
this(null);
}
public LocalDirsHandlerService(NodeManagerMetrics nodeManagerMetrics) {
super(LocalDirsHandlerService.class.getName());
this.nodeManagerMetrics = nodeManagerMetrics;
}
/**
* Method which initializes the timertask and its interval time.
*
*/
@Override
protected void serviceInit(Configuration config) throws Exception {
// Clone the configuration as we may do modifications to dirs-list
Configuration conf = new Configuration(config);
diskHealthCheckInterval = conf.getLong(
YarnConfiguration.NM_DISK_HEALTH_CHECK_INTERVAL_MS,
YarnConfiguration.DEFAULT_NM_DISK_HEALTH_CHECK_INTERVAL_MS);
monitoringTimerTask = new MonitoringTimerTask(conf);
isDiskHealthCheckerEnabled = conf.getBoolean(
YarnConfiguration.NM_DISK_HEALTH_CHECK_ENABLE, true);
minNeededHealthyDisksFactor = conf.getFloat(
YarnConfiguration.NM_MIN_HEALTHY_DISKS_FRACTION,
YarnConfiguration.DEFAULT_NM_MIN_HEALTHY_DISKS_FRACTION);
lastDisksCheckTime = System.currentTimeMillis();
super.serviceInit(conf);
FileContext localFs;
try {
localFs = FileContext.getLocalFSFileContext(config);
} catch (IOException e) {
throw new YarnRuntimeException("Unable to get the local filesystem", e);
}
FsPermission perm = new FsPermission((short)0755);
boolean createSucceeded = localDirs.createNonExistentDirs(localFs, perm);
createSucceeded &= logDirs.createNonExistentDirs(localFs, perm);
if (!createSucceeded) {
updateDirsAfterTest();
}
// Check the disk health immediately to weed out bad directories
// before other init code attempts to use them.
checkDirs();
}
/**
* Method used to start the disk health monitoring, if enabled.
*/
@Override
protected void serviceStart() throws Exception {
if (isDiskHealthCheckerEnabled) {
dirsHandlerScheduler = new Timer("DiskHealthMonitor-Timer", true);
dirsHandlerScheduler.scheduleAtFixedRate(monitoringTimerTask,
diskHealthCheckInterval, diskHealthCheckInterval);
}
super.serviceStart();
}
/**
* Method used to terminate the disk health monitoring service.
*/
@Override
protected void serviceStop() throws Exception {
if (dirsHandlerScheduler != null) {
dirsHandlerScheduler.cancel();
}
super.serviceStop();
}
public void registerLocalDirsChangeListener(DirsChangeListener listener) {
localDirs.registerDirsChangeListener(listener);
}
public void registerLogDirsChangeListener(DirsChangeListener listener) {
logDirs.registerDirsChangeListener(listener);
}
public void deregisterLocalDirsChangeListener(DirsChangeListener listener) {
localDirs.deregisterDirsChangeListener(listener);
}
public void deregisterLogDirsChangeListener(DirsChangeListener listener) {
logDirs.deregisterDirsChangeListener(listener);
}
/**
* @return the good/valid local directories based on disks' health
*/
public List<String> getLocalDirs() {
return localDirs.getGoodDirs();
}
/**
* @return the good/valid log directories based on disks' health
*/
public List<String> getLogDirs() {
return logDirs.getGoodDirs();
}
/**
* @return the local directories which have no disk space
*/
public List<String> getDiskFullLocalDirs() {
return localDirs.getFullDirs();
}
/**
* @return the log directories that have no disk space
*/
public List<String> getDiskFullLogDirs() {
return logDirs.getFullDirs();
}
/**
* Function to get the local dirs which should be considered for reading
* existing files on disk. Contains the good local dirs and the local dirs
* that have reached the disk space limit
*
* @return the local dirs which should be considered for reading
*/
public List<String> getLocalDirsForRead() {
return DirectoryCollection.concat(localDirs.getGoodDirs(),
localDirs.getFullDirs());
}
/**
* Function to get the local dirs which should be considered when cleaning up
* resources. Contains the good local dirs and the local dirs that have reached
* the disk space limit
*
* @return the local dirs which should be considered for cleaning up
*/
public List<String> getLocalDirsForCleanup() {
return DirectoryCollection.concat(localDirs.getGoodDirs(),
localDirs.getFullDirs());
}
/**
* Function to get the log dirs which should be considered for reading
* existing files on disk. Contains the good log dirs and the log dirs that
* have reached the disk space limit
*
* @return the log dirs which should be considered for reading
*/
public List<String> getLogDirsForRead() {
return DirectoryCollection.concat(logDirs.getGoodDirs(),
logDirs.getFullDirs());
}
/**
* Function to get the log dirs which should be considered when cleaning up
* resources. Contains the good log dirs and the log dirs that have reached
* the disk space limit
*
* @return the log dirs which should be considered for cleaning up
*/
public List<String> getLogDirsForCleanup() {
return DirectoryCollection.concat(logDirs.getGoodDirs(),
logDirs.getFullDirs());
}
/**
* Function to generate a report on the state of the disks.
*
* @param listGoodDirs
* flag to determine whether the report should report the state of
* good dirs or failed dirs
* @return the health report of nm-local-dirs and nm-log-dirs
*/
public String getDisksHealthReport(boolean listGoodDirs) {
if (!isDiskHealthCheckerEnabled) {
return "";
}
StringBuilder report = new StringBuilder();
List<String> erroredLocalDirsList = localDirs.getErroredDirs();
List<String> erroredLogDirsList = logDirs.getErroredDirs();
List<String> diskFullLocalDirsList = localDirs.getFullDirs();
List<String> diskFullLogDirsList = logDirs.getFullDirs();
List<String> goodLocalDirsList = localDirs.getGoodDirs();
List<String> goodLogDirsList = logDirs.getGoodDirs();
int numLocalDirs = goodLocalDirsList.size() + erroredLocalDirsList.size() + diskFullLocalDirsList.size();
int numLogDirs = goodLogDirsList.size() + erroredLogDirsList.size() + diskFullLogDirsList.size();
if (!listGoodDirs) {
if (!erroredLocalDirsList.isEmpty()) {
report.append(erroredLocalDirsList.size() + "/" + numLocalDirs
+ " local-dirs have errors: "
+ buildDiskErrorReport(erroredLocalDirsList, localDirs));
}
if (!diskFullLocalDirsList.isEmpty()) {
report.append(diskFullLocalDirsList.size() + "/" + numLocalDirs
+ " local-dirs " + diskCapacityExceededErrorMsg
+ buildDiskErrorReport(diskFullLocalDirsList, localDirs) + "; ");
}
if (!erroredLogDirsList.isEmpty()) {
report.append(erroredLogDirsList.size() + "/" + numLogDirs
+ " log-dirs have errors: "
+ buildDiskErrorReport(erroredLogDirsList, logDirs));
}
if (!diskFullLogDirsList.isEmpty()) {
report.append(diskFullLogDirsList.size() + "/" + numLogDirs
+ " log-dirs " + diskCapacityExceededErrorMsg
+ buildDiskErrorReport(diskFullLogDirsList, logDirs));
}
} else {
report.append(goodLocalDirsList.size() + "/" + numLocalDirs
+ " local-dirs are good: " + StringUtils.join(",", goodLocalDirsList)
+ "; ");
report.append(goodLogDirsList.size() + "/" + numLogDirs
+ " log-dirs are good: " + StringUtils.join(",", goodLogDirsList));
}
return report.toString();
}
@Override
public String getHealthReport() {
return getDisksHealthReport(false);
}
/**
* The minimum fraction of number of disks needed to be healthy for a node to
* be considered healthy in terms of disks is configured using
* {@link YarnConfiguration#NM_MIN_HEALTHY_DISKS_FRACTION}, with a default
* value of {@link YarnConfiguration#DEFAULT_NM_MIN_HEALTHY_DISKS_FRACTION}.
* @return <em>false</em> if either (a) more than the allowed percentage of
* nm-local-dirs failed or (b) more than the allowed percentage of
* nm-log-dirs failed.
*/
public boolean areDisksHealthy() {
if (!isDiskHealthCheckerEnabled) {
return true;
}
int goodDirs = getLocalDirs().size();
int failedDirs = localDirs.getFailedDirs().size();
int totalConfiguredDirs = goodDirs + failedDirs;
if (goodDirs/(float)totalConfiguredDirs < minNeededHealthyDisksFactor) {
return false; // Not enough healthy local-dirs
}
goodDirs = getLogDirs().size();
failedDirs = logDirs.getFailedDirs().size();
totalConfiguredDirs = goodDirs + failedDirs;
if (goodDirs/(float)totalConfiguredDirs < minNeededHealthyDisksFactor) {
return false; // Not enough healthy log-dirs
}
return true;
}
@Override
public boolean isHealthy() {
return areDisksHealthy();
}
public long getLastDisksCheckTime() {
return lastDisksCheckTime;
}
@Override
public long getLastHealthReportTime() {
return getLastDisksCheckTime();
}
public boolean isGoodLocalDir(String path) {
return isInGoodDirs(getLocalDirs(), path);
}
public boolean isGoodLogDir(String path) {
return isInGoodDirs(getLogDirs(), path);
}
private boolean isInGoodDirs(List<String> goodDirs, String path) {
for (String goodDir : goodDirs) {
if (path.startsWith(goodDir)) {
return true;
}
}
return false;
}
/**
* Set good local dirs and good log dirs in the configuration so that the
* LocalDirAllocator objects will use this updated configuration only.
*/
private void updateDirsAfterTest() {
Configuration conf = getConfig();
List<String> localDirs = getLocalDirs();
conf.setStrings(NM_GOOD_LOCAL_DIRS,
localDirs.toArray(new String[localDirs.size()]));
List<String> logDirs = getLogDirs();
conf.setStrings(NM_GOOD_LOG_DIRS,
logDirs.toArray(new String[logDirs.size()]));
if (!areDisksHealthy()) {
// Just log.
LOG.error("Most of the disks failed. " + getDisksHealthReport(false));
}
}
private void logDiskStatus(boolean newDiskFailure, boolean diskTurnedGood) {
if (newDiskFailure) {
String report = getDisksHealthReport(false);
LOG.info("Disk(s) failed: " + report);
}
if (diskTurnedGood) {
String report = getDisksHealthReport(true);
LOG.info("Disk(s) turned good: " + report);
}
}
@VisibleForTesting
public void checkDirs() {
boolean disksStatusChange = false;
Set<String> failedLocalDirsPreCheck =
new HashSet<String>(localDirs.getFailedDirs());
Set<String> failedLogDirsPreCheck =
new HashSet<String>(logDirs.getFailedDirs());
if (localDirs.checkDirs()) {
disksStatusChange = true;
}
if (logDirs.checkDirs()) {
disksStatusChange = true;
}
Set<String> failedLocalDirsPostCheck =
new HashSet<String>(localDirs.getFailedDirs());
Set<String> failedLogDirsPostCheck =
new HashSet<String>(logDirs.getFailedDirs());
boolean disksFailed = false;
boolean disksTurnedGood = false;
disksFailed =
disksTurnedBad(failedLocalDirsPreCheck, failedLocalDirsPostCheck);
disksTurnedGood =
disksTurnedGood(failedLocalDirsPreCheck, failedLocalDirsPostCheck);
// skip check if we have new failed or good local dirs since we're going to
// log anyway
if (!disksFailed) {
disksFailed =
disksTurnedBad(failedLogDirsPreCheck, failedLogDirsPostCheck);
}
if (!disksTurnedGood) {
disksTurnedGood =
disksTurnedGood(failedLogDirsPreCheck, failedLogDirsPostCheck);
}
logDiskStatus(disksFailed, disksTurnedGood);
if (disksStatusChange) {
updateDirsAfterTest();
}
updateMetrics();
lastDisksCheckTime = System.currentTimeMillis();
}
private boolean disksTurnedBad(Set<String> preCheckFailedDirs,
Set<String> postCheckDirs) {
boolean disksFailed = false;
for (String dir : postCheckDirs) {
if (!preCheckFailedDirs.contains(dir)) {
disksFailed = true;
break;
}
}
return disksFailed;
}
private boolean disksTurnedGood(Set<String> preCheckDirs,
Set<String> postCheckDirs) {
boolean disksTurnedGood = false;
for (String dir : preCheckDirs) {
if (!postCheckDirs.contains(dir)) {
disksTurnedGood = true;
break;
}
}
return disksTurnedGood;
}
private Path getPathToRead(String pathStr, List<String> dirs)
throws IOException {
// remove the leading slash from the path (to make sure that the uri
// resolution results in a valid path on the dir being checked)
if (pathStr.startsWith("/")) {
pathStr = pathStr.substring(1);
}
FileSystem localFS = FileSystem.getLocal(getConfig());
for (String dir : dirs) {
try {
Path tmpDir = new Path(dir);
File tmpFile = tmpDir.isAbsolute()
? new File(localFS.makeQualified(tmpDir).toUri())
: new File(dir);
Path file = new Path(tmpFile.getPath(), pathStr);
if (localFS.exists(file)) {
return file;
}
} catch (IOException ie) {
// ignore
LOG.warn("Failed to find " + pathStr + " at " + dir, ie);
}
}
throw new IOException("Could not find " + pathStr + " in any of" +
" the directories");
}
public Path getLocalPathForWrite(String pathStr) throws IOException {
return localDirsAllocator.getLocalPathForWrite(pathStr, getConfig());
}
public Path getLocalPathForWrite(String pathStr, long size,
boolean checkWrite) throws IOException {
return localDirsAllocator.getLocalPathForWrite(pathStr, size, getConfig(),
checkWrite);
}
public Path getLocalPathForRead(String pathStr) throws IOException {
return getPathToRead(pathStr, getLocalDirsForRead());
}
public Iterable<Path> getAllLocalPathsForRead(String pathStr) throws IOException {
return localDirsAllocator.getAllLocalPathsToRead(pathStr, getConfig());
}
public Path getLogPathForWrite(String pathStr, boolean checkWrite)
throws IOException {
return logDirsAllocator.getLocalPathForWrite(pathStr,
LocalDirAllocator.SIZE_UNKNOWN, getConfig(), checkWrite);
}
public Path getLogPathToRead(String pathStr) throws IOException {
return getPathToRead(pathStr, getLogDirsForRead());
}
public static String[] validatePaths(String[] paths) {
ArrayList<String> validPaths = new ArrayList<String>();
for (int i = 0; i < paths.length; ++i) {
try {
URI uriPath = (new Path(paths[i])).toUri();
if (uriPath.getScheme() == null
|| uriPath.getScheme().equals(FILE_SCHEME)) {
validPaths.add(new Path(uriPath.getPath()).toString());
} else {
LOG.warn(paths[i] + " is not a valid path. Path should be with "
+ FILE_SCHEME + " scheme or without scheme");
throw new YarnRuntimeException(paths[i]
+ " is not a valid path. Path should be with " + FILE_SCHEME
+ " scheme or without scheme");
}
} catch (IllegalArgumentException e) {
LOG.warn(e.getMessage());
throw new YarnRuntimeException(paths[i]
+ " is not a valid path. Path should be with " + FILE_SCHEME
+ " scheme or without scheme");
}
}
String[] arrValidPaths = new String[validPaths.size()];
validPaths.toArray(arrValidPaths);
return arrValidPaths;
}
protected void updateMetrics() {
if (nodeManagerMetrics != null) {
nodeManagerMetrics.setBadLocalDirs(localDirs.getFailedDirs().size());
nodeManagerMetrics.setBadLogDirs(logDirs.getFailedDirs().size());
nodeManagerMetrics.setGoodLocalDirsDiskUtilizationPerc(
localDirs.getGoodDirsDiskUtilizationPercentage());
nodeManagerMetrics.setGoodLogDirsDiskUtilizationPerc(
logDirs.getGoodDirsDiskUtilizationPercentage());
}
}
private String buildDiskErrorReport(List<String> dirs, DirectoryCollection directoryCollection) {
StringBuilder sb = new StringBuilder();
sb.append(" [ ");
for (int i = 0; i < dirs.size(); i++) {
final String dirName = dirs.get(i);
if ( directoryCollection.isDiskUnHealthy(dirName)) {
sb.append(dirName + " : " + directoryCollection.getDirectoryErrorInfo(dirName).message);
} else {
sb.append(dirName + " : " + "Unknown cause for disk error");
}
if ( i != (dirs.size() - 1)) {
sb.append(" , ");
}
}
sb.append(" ] ");
return sb.toString();
}
}
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