hadoop DirectoryCollection 源码
haddop DirectoryCollection 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/DirectoryCollection.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.FileNotFoundException;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock.ReadLock;
import java.util.concurrent.locks.ReentrantReadWriteLock.WriteLock;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.fs.FileAlreadyExistsException;
import org.apache.hadoop.fs.FileContext;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.permission.FsPermission;
import org.apache.hadoop.util.DiskValidator;
import org.apache.hadoop.util.DiskValidatorFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.yarn.conf.YarnConfiguration;
import org.apache.hadoop.yarn.exceptions.YarnRuntimeException;
import org.apache.hadoop.classification.VisibleForTesting;
import org.apache.hadoop.thirdparty.com.google.common.collect.ImmutableList;
/**
* Manages a list of local storage directories.
*/
public class DirectoryCollection {
private static final Logger LOG =
LoggerFactory.getLogger(DirectoryCollection.class);
private final Configuration conf;
private final DiskValidator diskValidator;
private boolean diskUtilizationThresholdEnabled;
private boolean diskFreeSpaceThresholdEnabled;
/**
* The enum defines disk failure type.
*/
public enum DiskErrorCause {
DISK_FULL, OTHER
}
static class DiskErrorInformation {
DiskErrorCause cause;
String message;
DiskErrorInformation(DiskErrorCause cause, String message) {
this.cause = cause;
this.message = message;
}
}
/**
* The interface provides a callback when localDirs is changed.
*/
public interface DirsChangeListener {
void onDirsChanged();
}
/**
* Returns a merged list which contains all the elements of l1 and l2
* @param l1 the first list to be included
* @param l2 the second list to be included
* @return a new list containing all the elements of the first and second list
*/
static List<String> concat(List<String> l1, List<String> l2) {
List<String> ret = new ArrayList<String>(l1.size() + l2.size());
ret.addAll(l1);
ret.addAll(l2);
return ret;
}
// Good local storage directories
private List<String> localDirs;
private List<String> errorDirs;
private List<String> fullDirs;
private Map<String, DiskErrorInformation> directoryErrorInfo;
// read/write lock for accessing above directories.
private final ReadLock readLock;
private final WriteLock writeLock;
private int numFailures;
private float diskUtilizationPercentageCutoffHigh;
private float diskUtilizationPercentageCutoffLow;
private long diskFreeSpaceCutoffLow;
private long diskFreeSpaceCutoffHigh;
private int goodDirsDiskUtilizationPercentage;
private Set<DirsChangeListener> dirsChangeListeners;
/**
* Create collection for the directories specified. No check for free space.
*
* @param dirs
* directories to be monitored
*/
public DirectoryCollection(String[] dirs) {
this(dirs, 100.0F, 100.0F, 0, 0);
}
/**
* Create collection for the directories specified. Users must specify the
* maximum percentage of disk utilization allowed. Minimum amount of disk
* space is not checked.
*
* @param dirs
* directories to be monitored
* @param utilizationPercentageCutOff
* percentage of disk that can be used before the dir is taken out of
* the good dirs list
*
*/
public DirectoryCollection(String[] dirs, float utilizationPercentageCutOff) {
this(dirs, utilizationPercentageCutOff, utilizationPercentageCutOff, 0, 0);
}
/**
* Create collection for the directories specified. Users must specify the
* minimum amount of free space that must be available for the dir to be used.
*
* @param dirs
* directories to be monitored
* @param utilizationSpaceCutOff
* minimum space, in MB, that must be available on the disk for the
* dir to be marked as good
*
*/
public DirectoryCollection(String[] dirs, long utilizationSpaceCutOff) {
this(dirs, 100.0F, 100.0F, utilizationSpaceCutOff, utilizationSpaceCutOff);
}
/**
* Create collection for the directories specified. Users must specify the
* minimum amount of free space that must be available for the dir to be used.
*
* @param dirs
* directories to be monitored
* @param utilizationSpaceCutOffLow
* minimum space, in MB, that must be available on the disk for the
* dir to be taken out of the good dirs list
* @param utilizationSpaceCutOffHigh
* minimum space, in MB, that must be available on the disk for the
* dir to be moved from the bad dirs list to the good dirs list
*/
public DirectoryCollection(String[] dirs, long utilizationSpaceCutOffLow,
long utilizationSpaceCutOffHigh) {
this(dirs, 100.0F, 100.0F, utilizationSpaceCutOffLow,
utilizationSpaceCutOffHigh);
}
/**
* Create collection for the directories specified. Users must specify the
* maximum percentage of disk utilization allowed and the minimum amount of
* free space that must be available for the dir to be used. If either check
* fails the dir is removed from the good dirs list.
*
* @param dirs
* directories to be monitored
* @param utilizationPercentageCutOffHigh
* percentage of disk that can be used before the dir is taken out of
* the good dirs list
* @param utilizationPercentageCutOffLow
* percentage of disk that can be used when the dir is moved from
* the bad dirs list to the good dirs list
* @param utilizationSpaceCutOff
* minimum space, in MB, that must be available on the disk for the
* dir to be marked as good
*/
public DirectoryCollection(String[] dirs,
float utilizationPercentageCutOffHigh,
float utilizationPercentageCutOffLow, long utilizationSpaceCutOff) {
this(dirs, utilizationPercentageCutOffHigh,
utilizationPercentageCutOffLow, utilizationSpaceCutOff,
utilizationSpaceCutOff);
}
/**
* Create collection for the directories specified. Users must specify the
* maximum percentage of disk utilization allowed and the minimum amount of
* free space that must be available for the dir to be used. If either check
* fails the dir is removed from the good dirs list.
*
* @param dirs
* directories to be monitored
* @param utilizationPercentageCutOffHigh
* percentage of disk that can be used before the dir is taken out
* of the good dirs list
* @param utilizationPercentageCutOffLow
* percentage of disk that can be used when the dir is moved from
* the bad dirs list to the good dirs list
* @param utilizationSpaceCutOffLow
* minimum space, in MB, that must be available on the disk for the
* dir to be taken out of the good dirs list
* @param utilizationSpaceCutOffHigh
* minimum space, in MB, that must be available on the disk for the
* dir to be moved from the bad dirs list to the good dirs list
*/
public DirectoryCollection(String[] dirs,
float utilizationPercentageCutOffHigh,
float utilizationPercentageCutOffLow,
long utilizationSpaceCutOffLow,
long utilizationSpaceCutOffHigh) {
conf = new YarnConfiguration();
try {
String diskValidatorName = conf.get(YarnConfiguration.DISK_VALIDATOR,
YarnConfiguration.DEFAULT_DISK_VALIDATOR);
diskValidator = DiskValidatorFactory.getInstance(diskValidatorName);
LOG.info("Disk Validator '" + diskValidatorName + "' is loaded.");
} catch (Exception e) {
throw new YarnRuntimeException(e);
}
diskUtilizationThresholdEnabled = conf.
getBoolean(YarnConfiguration.
NM_DISK_UTILIZATION_THRESHOLD_ENABLED,
YarnConfiguration.
DEFAULT_NM_DISK_UTILIZATION_THRESHOLD_ENABLED);
diskFreeSpaceThresholdEnabled = conf.
getBoolean(YarnConfiguration.
NM_DISK_FREE_SPACE_THRESHOLD_ENABLED,
YarnConfiguration.
DEFAULT_NM_DISK_FREE_SPACE_THRESHOLD_ENABLED);
localDirs = new ArrayList<>(Arrays.asList(dirs));
errorDirs = new ArrayList<>();
fullDirs = new ArrayList<>();
directoryErrorInfo = new ConcurrentHashMap<>();
ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
this.readLock = lock.readLock();
this.writeLock = lock.writeLock();
setDiskUtilizationPercentageCutoff(utilizationPercentageCutOffHigh,
utilizationPercentageCutOffLow);
setDiskUtilizationSpaceCutoff(utilizationSpaceCutOffLow,
utilizationSpaceCutOffHigh);
dirsChangeListeners = Collections.newSetFromMap(
new ConcurrentHashMap<DirsChangeListener, Boolean>());
}
void registerDirsChangeListener(
DirsChangeListener listener) {
if (dirsChangeListeners.add(listener)) {
listener.onDirsChanged();
}
}
void deregisterDirsChangeListener(
DirsChangeListener listener) {
dirsChangeListeners.remove(listener);
}
/**
* @return the current valid directories
*/
List<String> getGoodDirs() {
this.readLock.lock();
try {
return ImmutableList.copyOf(localDirs);
} finally {
this.readLock.unlock();
}
}
/**
* @return the failed directories
*/
List<String> getFailedDirs() {
this.readLock.lock();
try {
return Collections.unmodifiableList(
DirectoryCollection.concat(errorDirs, fullDirs));
} finally {
this.readLock.unlock();
}
}
/**
* @return the directories that have used all disk space
*/
List<String> getFullDirs() {
this.readLock.lock();
try {
return ImmutableList.copyOf(fullDirs);
} finally {
this.readLock.unlock();
}
}
/**
* @return the directories that have errors - many not have appropriate permissions
* or other disk validation checks might have failed in {@link DiskValidator}
*
*/
@InterfaceStability.Evolving
List<String> getErroredDirs() {
this.readLock.lock();
try {
return ImmutableList.copyOf(errorDirs);
} finally {
this.readLock.unlock();
}
}
/**
* @return total the number of directory failures seen till now
*/
int getNumFailures() {
this.readLock.lock();
try {
return numFailures;
}finally {
this.readLock.unlock();
}
}
/**
*
* @param dirName Absolute path of Directory for which error diagnostics are needed
* @return DiskErrorInformation - disk error diagnostics for the specified directory
* null - the disk associated with the directory has passed disk utilization checks
* /error validations in {@link DiskValidator}
*
*/
@InterfaceStability.Evolving
DiskErrorInformation getDirectoryErrorInfo(String dirName) {
this.readLock.lock();
try {
return directoryErrorInfo.get(dirName);
} finally {
this.readLock.unlock();
}
}
/**
*
* @param dirName Absolute path of Directory for which the disk has been marked as unhealthy
* @return Check if disk associated with the directory is unhealthy
*/
@InterfaceStability.Evolving
boolean isDiskUnHealthy(String dirName) {
this.readLock.lock();
try {
return directoryErrorInfo.containsKey(dirName);
} finally {
this.readLock.unlock();
}
}
/**
* Create any non-existent directories and parent directories, updating the
* list of valid directories if necessary.
* @param localFs local file system to use
* @param perm absolute permissions to use for any directories created
* @return true if there were no errors, false if at least one error occurred
*/
boolean createNonExistentDirs(FileContext localFs,
FsPermission perm) {
boolean failed = false;
List<String> localDirectories = null;
this.readLock.lock();
try {
localDirectories = new ArrayList<>(localDirs);
} finally {
this.readLock.unlock();
}
for (final String dir : localDirectories) {
try {
createDir(localFs, new Path(dir), perm);
} catch (IOException e) {
LOG.warn("Unable to create directory " + dir + " error " +
e.getMessage() + ", removing from the list of valid directories.");
this.writeLock.lock();
try {
localDirs.remove(dir);
errorDirs.add(dir);
directoryErrorInfo.put(dir,
new DiskErrorInformation(DiskErrorCause.OTHER,
"Cannot create directory : " + dir + ", error " + e.getMessage()));
numFailures++;
} finally {
this.writeLock.unlock();
}
failed = true;
}
}
return !failed;
}
/**
* Check the health of current set of local directories(good and failed),
* updating the list of valid directories if necessary.
*
* @return <em>true</em> if there is a new disk-failure identified in this
* checking or a failed directory passes the disk check <em>false</em>
* otherwise.
*/
boolean checkDirs() {
boolean setChanged = false;
Set<String> preCheckGoodDirs = null;
Set<String> preCheckFullDirs = null;
Set<String> preCheckOtherErrorDirs = null;
List<String> failedDirs = null;
List<String> allLocalDirs = null;
this.readLock.lock();
try {
preCheckGoodDirs = new HashSet<String>(localDirs);
preCheckFullDirs = new HashSet<String>(fullDirs);
preCheckOtherErrorDirs = new HashSet<String>(errorDirs);
failedDirs = DirectoryCollection.concat(errorDirs, fullDirs);
allLocalDirs = DirectoryCollection.concat(localDirs, failedDirs);
} finally {
this.readLock.unlock();
}
// move testDirs out of any lock as it could wait for very long time in
// case of busy IO
Map<String, DiskErrorInformation> dirsFailedCheck = testDirs(allLocalDirs,
preCheckGoodDirs);
this.writeLock.lock();
try {
localDirs.clear();
errorDirs.clear();
fullDirs.clear();
directoryErrorInfo.clear();
for (Map.Entry<String, DiskErrorInformation> entry : dirsFailedCheck
.entrySet()) {
String dir = entry.getKey();
DiskErrorInformation errorInformation = entry.getValue();
switch (entry.getValue().cause) {
case DISK_FULL:
fullDirs.add(entry.getKey());
break;
case OTHER:
errorDirs.add(entry.getKey());
break;
default:
LOG.warn(entry.getValue().cause + " is unknown for disk error.");
break;
}
directoryErrorInfo.put(entry.getKey(), errorInformation);
if (preCheckGoodDirs.contains(dir)) {
LOG.warn("Directory " + dir + " error, " + errorInformation.message
+ ", removing from list of valid directories");
setChanged = true;
numFailures++;
}
}
for (String dir : allLocalDirs) {
if (!dirsFailedCheck.containsKey(dir)) {
localDirs.add(dir);
if (preCheckFullDirs.contains(dir)
|| preCheckOtherErrorDirs.contains(dir)) {
setChanged = true;
LOG.info("Directory " + dir
+ " passed disk check, adding to list of valid directories.");
}
}
}
Set<String> postCheckFullDirs = new HashSet<String>(fullDirs);
Set<String> postCheckOtherDirs = new HashSet<String>(errorDirs);
for (String dir : preCheckFullDirs) {
if (postCheckOtherDirs.contains(dir)) {
LOG.warn("Directory " + dir + " error "
+ dirsFailedCheck.get(dir).message);
}
}
for (String dir : preCheckOtherErrorDirs) {
if (postCheckFullDirs.contains(dir)) {
LOG.warn("Directory " + dir + " error "
+ dirsFailedCheck.get(dir).message);
}
}
setGoodDirsDiskUtilizationPercentage();
if (setChanged) {
for (DirsChangeListener listener : dirsChangeListeners) {
listener.onDirsChanged();
}
}
return setChanged;
} finally {
this.writeLock.unlock();
}
}
Map<String, DiskErrorInformation> testDirs(List<String> dirs,
Set<String> goodDirs) {
HashMap<String, DiskErrorInformation> ret =
new HashMap<String, DiskErrorInformation>();
for (final String dir : dirs) {
String msg;
try {
File testDir = new File(dir);
diskValidator.checkStatus(testDir);
float diskUtilizationPercentageCutoff = goodDirs.contains(dir) ?
diskUtilizationPercentageCutoffHigh : diskUtilizationPercentageCutoffLow;
long diskFreeSpaceCutoff = goodDirs.contains(dir) ?
diskFreeSpaceCutoffLow : diskFreeSpaceCutoffHigh;
if (diskUtilizationThresholdEnabled
&& isDiskUsageOverPercentageLimit(testDir,
diskUtilizationPercentageCutoff)) {
msg =
"used space above threshold of "
+ diskUtilizationPercentageCutoff
+ "%";
ret.put(dir,
new DiskErrorInformation(DiskErrorCause.DISK_FULL, msg));
continue;
} else if (diskFreeSpaceThresholdEnabled
&& isDiskFreeSpaceUnderLimit(testDir, diskFreeSpaceCutoff)) {
msg =
"free space below limit of " + diskFreeSpaceCutoff
+ "MB";
ret.put(dir,
new DiskErrorInformation(DiskErrorCause.DISK_FULL, msg));
continue;
}
} catch (IOException ie) {
ret.put(dir,
new DiskErrorInformation(DiskErrorCause.OTHER, ie.getMessage()));
}
}
return ret;
}
private boolean isDiskUsageOverPercentageLimit(File dir,
float diskUtilizationPercentageCutoff) {
float freePercentage =
100 * (dir.getUsableSpace() / (float) dir.getTotalSpace());
float usedPercentage = 100.0F - freePercentage;
return (usedPercentage > diskUtilizationPercentageCutoff
|| usedPercentage >= 100.0F);
}
private boolean isDiskFreeSpaceUnderLimit(File dir,
long freeSpaceCutoff) {
long freeSpace = dir.getUsableSpace() / (1024 * 1024);
return freeSpace < freeSpaceCutoff;
}
private void createDir(FileContext localFs, Path dir, FsPermission perm)
throws IOException {
if (dir == null) {
return;
}
try {
localFs.getFileStatus(dir);
} catch (FileNotFoundException e) {
createDir(localFs, dir.getParent(), perm);
try {
localFs.mkdir(dir, perm, false);
} catch (FileAlreadyExistsException ex) {
// do nothing as other threads could in creating the same directory.
}
if (!perm.equals(perm.applyUMask(localFs.getUMask()))) {
localFs.setPermission(dir, perm);
}
}
}
@VisibleForTesting
float getDiskUtilizationPercentageCutoffHigh() {
return diskUtilizationPercentageCutoffHigh;
}
@VisibleForTesting
float getDiskUtilizationPercentageCutoffLow() {
return diskUtilizationPercentageCutoffLow;
}
public void setDiskUtilizationPercentageCutoff(
float utilizationPercentageCutOffHigh,
float utilizationPercentageCutOffLow) {
diskUtilizationPercentageCutoffHigh = Math.max(0.0F, Math.min(100.0F,
utilizationPercentageCutOffHigh));
diskUtilizationPercentageCutoffLow = Math.max(0.0F, Math.min(
diskUtilizationPercentageCutoffHigh, utilizationPercentageCutOffLow));
}
public long getDiskUtilizationSpaceCutoff() {
return getDiskUtilizationSpaceCutoffLow();
}
@VisibleForTesting
long getDiskUtilizationSpaceCutoffLow() {
return diskFreeSpaceCutoffLow;
}
@VisibleForTesting
long getDiskUtilizationSpaceCutoffHigh() {
return diskFreeSpaceCutoffHigh;
}
@VisibleForTesting
boolean getDiskUtilizationThresholdEnabled() {
return diskUtilizationThresholdEnabled;
}
@VisibleForTesting
boolean getDiskFreeSpaceThresholdEnabled() {
return diskFreeSpaceThresholdEnabled;
}
@VisibleForTesting
void setDiskUtilizationThresholdEnabled(boolean
utilizationEnabled) {
diskUtilizationThresholdEnabled = utilizationEnabled;
}
@VisibleForTesting
void setDiskFreeSpaceThresholdEnabled(boolean
freeSpaceEnabled) {
diskFreeSpaceThresholdEnabled = freeSpaceEnabled;
}
public void setDiskUtilizationSpaceCutoff(long freeSpaceCutoff) {
setDiskUtilizationSpaceCutoff(freeSpaceCutoff,
freeSpaceCutoff);
}
public void setDiskUtilizationSpaceCutoff(long freeSpaceCutoffLow,
long freeSpaceCutoffHigh) {
diskFreeSpaceCutoffLow = Math.max(0, freeSpaceCutoffLow);
diskFreeSpaceCutoffHigh = Math.max(diskFreeSpaceCutoffLow,
Math.max(0, freeSpaceCutoffHigh));
}
private void setGoodDirsDiskUtilizationPercentage() {
long totalSpace = 0;
long usableSpace = 0;
for (String dir : localDirs) {
File f = new File(dir);
if (!f.isDirectory()) {
continue;
}
totalSpace += f.getTotalSpace();
usableSpace += f.getUsableSpace();
}
if (totalSpace != 0) {
long tmp = ((totalSpace - usableSpace) * 100) / totalSpace;
if (Integer.MIN_VALUE < tmp && Integer.MAX_VALUE > tmp) {
goodDirsDiskUtilizationPercentage = Math.toIntExact(tmp);
}
} else {
// got no good dirs
goodDirsDiskUtilizationPercentage = 0;
}
}
public int getGoodDirsDiskUtilizationPercentage() {
return goodDirsDiskUtilizationPercentage;
}
}
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