/**
* 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.resourcemanager.recovery;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.ArrayList;
import java.util.EnumSet;
import java.util.List;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.classification.InterfaceAudience.Private;
import org.apache.hadoop.classification.InterfaceStability.Unstable;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.PathFilter;
import org.apache.hadoop.fs.XAttrSetFlag;
import org.apache.hadoop.io.IOUtils;
import org.apache.hadoop.security.token.delegation.DelegationKey;
import org.apache.hadoop.yarn.api.records.ApplicationAttemptId;
import org.apache.hadoop.yarn.api.records.ApplicationId;
import org.apache.hadoop.yarn.conf.YarnConfiguration;
import org.apache.hadoop.yarn.proto.YarnServerCommonProtos.VersionProto;
import org.apache.hadoop.yarn.proto.YarnServerResourceManagerRecoveryProtos.AMRMTokenSecretManagerStateProto;
import org.apache.hadoop.yarn.proto.YarnServerResourceManagerRecoveryProtos.ApplicationAttemptStateDataProto;
import org.apache.hadoop.yarn.proto.YarnServerResourceManagerRecoveryProtos.ApplicationStateDataProto;
import org.apache.hadoop.yarn.proto.YarnServerResourceManagerRecoveryProtos.EpochProto;
import org.apache.hadoop.yarn.security.client.RMDelegationTokenIdentifier;
import org.apache.hadoop.yarn.server.records.Version;
import org.apache.hadoop.yarn.server.records.impl.pb.VersionPBImpl;
import org.apache.hadoop.yarn.server.resourcemanager.recovery.records.AMRMTokenSecretManagerState;
import org.apache.hadoop.yarn.server.resourcemanager.recovery.records.ApplicationAttemptStateData;
import org.apache.hadoop.yarn.server.resourcemanager.recovery.records.ApplicationStateData;
import org.apache.hadoop.yarn.server.resourcemanager.recovery.records.Epoch;
import org.apache.hadoop.yarn.server.resourcemanager.recovery.records.RMDelegationTokenIdentifierData;
import org.apache.hadoop.yarn.server.resourcemanager.recovery.records.impl.pb.AMRMTokenSecretManagerStatePBImpl;
import org.apache.hadoop.yarn.server.resourcemanager.recovery.records.impl.pb.ApplicationAttemptStateDataPBImpl;
import org.apache.hadoop.yarn.server.resourcemanager.recovery.records.impl.pb.ApplicationStateDataPBImpl;
import org.apache.hadoop.yarn.server.resourcemanager.recovery.records.impl.pb.EpochPBImpl;
import com.google.common.annotations.VisibleForTesting;
@Private
@Unstable
/**
* A simple class for storing RM state in any storage that implements a basic
* FileSystem interface. Does not use directories so that simple key-value
* stores can be used. The retry policy for the real filesystem client must be
* configured separately to enable retry of filesystem operations when needed.
*
* Changes from 1.1 to 1.2, AMRMTokenSecretManager state has been saved
* separately. The currentMasterkey and nextMasterkey have been stored.
* Also, AMRMToken has been removed from ApplicationAttemptState.
*/
public class FileSystemRMStateStore extends RMStateStore {
public static final Log LOG = LogFactory.getLog(FileSystemRMStateStore.class);
protected static final String ROOT_DIR_NAME = "FSRMStateRoot";
protected static final Version CURRENT_VERSION_INFO = Version
.newInstance(1, 2);
protected static final String AMRMTOKEN_SECRET_MANAGER_NODE =
"AMRMTokenSecretManagerNode";
private static final String UNREADABLE_BY_SUPERUSER_XATTRIB =
"security.hdfs.unreadable.by.superuser";
protected FileSystem fs;
private Path rootDirPath;
@Private
@VisibleForTesting
Path rmDTSecretManagerRoot;
private Path rmAppRoot;
private Path dtSequenceNumberPath = null;
private int fsNumRetries;
private long fsRetryInterval;
private boolean intermediateEncryptionEnabled =
YarnConfiguration.DEFAULT_YARN_INTERMEDIATE_DATA_ENCRYPTION;
@VisibleForTesting
Path fsWorkingPath;
Path amrmTokenSecretManagerRoot;
@Override
public synchronized void initInternal(Configuration conf)
throws Exception{
fsWorkingPath = new Path(conf.get(YarnConfiguration.FS_RM_STATE_STORE_URI));
rootDirPath = new Path(fsWorkingPath, ROOT_DIR_NAME);
rmDTSecretManagerRoot = new Path(rootDirPath, RM_DT_SECRET_MANAGER_ROOT);
rmAppRoot = new Path(rootDirPath, RM_APP_ROOT);
amrmTokenSecretManagerRoot =
new Path(rootDirPath, AMRMTOKEN_SECRET_MANAGER_ROOT);
fsNumRetries =
conf.getInt(YarnConfiguration.FS_RM_STATE_STORE_NUM_RETRIES,
YarnConfiguration.DEFAULT_FS_RM_STATE_STORE_NUM_RETRIES);
fsRetryInterval =
conf.getLong(YarnConfiguration.FS_RM_STATE_STORE_RETRY_INTERVAL_MS,
YarnConfiguration.DEFAULT_FS_RM_STATE_STORE_RETRY_INTERVAL_MS);
intermediateEncryptionEnabled =
conf.getBoolean(YarnConfiguration.YARN_INTERMEDIATE_DATA_ENCRYPTION,
YarnConfiguration.DEFAULT_YARN_INTERMEDIATE_DATA_ENCRYPTION);
}
@Override
protected synchronized void startInternal() throws Exception {
// create filesystem only now, as part of service-start. By this time, RM is
// authenticated with kerberos so we are good to create a file-system
// handle.
Configuration conf = new Configuration(getConfig());
conf.setBoolean("dfs.client.retry.policy.enabled", true);
String retryPolicy =
conf.get(YarnConfiguration.FS_RM_STATE_STORE_RETRY_POLICY_SPEC,
YarnConfiguration.DEFAULT_FS_RM_STATE_STORE_RETRY_POLICY_SPEC);
conf.set("dfs.client.retry.policy.spec", retryPolicy);
fs = fsWorkingPath.getFileSystem(conf);
mkdirsWithRetries(rmDTSecretManagerRoot);
mkdirsWithRetries(rmAppRoot);
mkdirsWithRetries(amrmTokenSecretManagerRoot);
}
@Override
protected synchronized void closeInternal() throws Exception {
closeWithRetries();
}
@Override
protected Version getCurrentVersion() {
return CURRENT_VERSION_INFO;
}
@Override
protected synchronized Version loadVersion() throws Exception {
Path versionNodePath = getNodePath(rootDirPath, VERSION_NODE);
FileStatus status = getFileStatusWithRetries(versionNodePath);
if (status != null) {
byte[] data = readFileWithRetries(versionNodePath, status.getLen());
Version version =
new VersionPBImpl(VersionProto.parseFrom(data));
return version;
}
return null;
}
@Override
protected synchronized void storeVersion() throws Exception {
Path versionNodePath = getNodePath(rootDirPath, VERSION_NODE);
byte[] data =
((VersionPBImpl) CURRENT_VERSION_INFO).getProto().toByteArray();
if (existsWithRetries(versionNodePath)) {
updateFile(versionNodePath, data, false);
} else {
writeFileWithRetries(versionNodePath, data, false);
}
}
@Override
public synchronized long getAndIncrementEpoch() throws Exception {
Path epochNodePath = getNodePath(rootDirPath, EPOCH_NODE);
long currentEpoch = 0;
FileStatus status = getFileStatusWithRetries(epochNodePath);
if (status != null) {
// load current epoch
byte[] data = readFileWithRetries(epochNodePath, status.getLen());
Epoch epoch = new EpochPBImpl(EpochProto.parseFrom(data));
currentEpoch = epoch.getEpoch();
// increment epoch and store it
byte[] storeData = Epoch.newInstance(currentEpoch + 1).getProto()
.toByteArray();
updateFile(epochNodePath, storeData, false);
} else {
// initialize epoch file with 1 for the next time.
byte[] storeData = Epoch.newInstance(currentEpoch + 1).getProto()
.toByteArray();
writeFileWithRetries(epochNodePath, storeData, false);
}
return currentEpoch;
}
@Override
public synchronized RMState loadState() throws Exception {
RMState rmState = new RMState();
// recover DelegationTokenSecretManager
loadRMDTSecretManagerState(rmState);
// recover RM applications
loadRMAppState(rmState);
// recover AMRMTokenSecretManager
loadAMRMTokenSecretManagerState(rmState);
return rmState;
}
private void loadAMRMTokenSecretManagerState(RMState rmState)
throws Exception {
checkAndResumeUpdateOperation(amrmTokenSecretManagerRoot);
Path amrmTokenSecretManagerStateDataDir =
new Path(amrmTokenSecretManagerRoot, AMRMTOKEN_SECRET_MANAGER_NODE);
FileStatus status = getFileStatusWithRetries(
amrmTokenSecretManagerStateDataDir);
if (status == null) {
return;
}
assert status.isFile();
byte[] data = readFileWithRetries(amrmTokenSecretManagerStateDataDir,
status.getLen());
AMRMTokenSecretManagerStatePBImpl stateData =
new AMRMTokenSecretManagerStatePBImpl(
AMRMTokenSecretManagerStateProto.parseFrom(data));
rmState.amrmTokenSecretManagerState =
AMRMTokenSecretManagerState.newInstance(
stateData.getCurrentMasterKey(), stateData.getNextMasterKey());
}
private void loadRMAppState(RMState rmState) throws Exception {
try {
List<ApplicationAttemptStateData> attempts =
new ArrayList<ApplicationAttemptStateData>();
for (FileStatus appDir : listStatusWithRetries(rmAppRoot)) {
checkAndResumeUpdateOperation(appDir.getPath());
for (FileStatus childNodeStatus :
listStatusWithRetries(appDir.getPath())) {
assert childNodeStatus.isFile();
String childNodeName = childNodeStatus.getPath().getName();
if (checkAndRemovePartialRecordWithRetries(
childNodeStatus.getPath())) {
continue;
}
byte[] childData = readFileWithRetries(childNodeStatus.getPath(),
childNodeStatus.getLen());
// Set attribute if not already set
setUnreadableBySuperuserXattrib(childNodeStatus.getPath());
if (childNodeName.startsWith(ApplicationId.appIdStrPrefix)) {
// application
if (LOG.isDebugEnabled()) {
LOG.debug("Loading application from node: " + childNodeName);
}
ApplicationStateDataPBImpl appState =
new ApplicationStateDataPBImpl(
ApplicationStateDataProto.parseFrom(childData));
ApplicationId appId =
appState.getApplicationSubmissionContext().getApplicationId();
rmState.appState.put(appId, appState);
} else if (childNodeName
.startsWith(ApplicationAttemptId.appAttemptIdStrPrefix)) {
// attempt
if (LOG.isDebugEnabled()) {
LOG.debug("Loading application attempt from node: "
+ childNodeName);
}
ApplicationAttemptStateDataPBImpl attemptState =
new ApplicationAttemptStateDataPBImpl(
ApplicationAttemptStateDataProto.parseFrom(childData));
attempts.add(attemptState);
} else {
LOG.info("Unknown child node with name: " + childNodeName);
}
}
}
// go through all attempts and add them to their apps, Ideally, each
// attempt node must have a corresponding app node, because remove
// directory operation remove both at the same time
for (ApplicationAttemptStateData attemptState : attempts) {
ApplicationId appId = attemptState.getAttemptId().getApplicationId();
ApplicationStateData appState = rmState.appState.get(appId);
assert appState != null;
appState.attempts.put(attemptState.getAttemptId(), attemptState);
}
LOG.info("Done loading applications from FS state store");
} catch (Exception e) {
LOG.error("Failed to load state.", e);
throw e;
}
}
private boolean checkAndRemovePartialRecord(Path record) throws IOException {
// If the file ends with .tmp then it shows that it failed
// during saving state into state store. The file will be deleted as a
// part of this call
if (record.getName().endsWith(".tmp")) {
LOG.error("incomplete rm state store entry found :"
+ record);
fs.delete(record, false);
return true;
}
return false;
}
private void checkAndResumeUpdateOperation(Path path) throws Exception {
// Before loading the state information, check whether .new file exists.
// If it does, the prior updateFile is failed on half way. We need to
// complete replacing the old file first.
FileStatus[] newChildNodes =
listStatusWithRetries(path, new PathFilter() {
@Override
public boolean accept(Path path) {
return path.getName().endsWith(".new");
}
});
for(FileStatus newChildNodeStatus : newChildNodes) {
assert newChildNodeStatus.isFile();
String newChildNodeName = newChildNodeStatus.getPath().getName();
String childNodeName = newChildNodeName.substring(
0, newChildNodeName.length() - ".new".length());
Path childNodePath =
new Path(newChildNodeStatus.getPath().getParent(), childNodeName);
replaceFile(newChildNodeStatus.getPath(), childNodePath);
}
}
private void loadRMDTSecretManagerState(RMState rmState) throws Exception {
checkAndResumeUpdateOperation(rmDTSecretManagerRoot);
FileStatus[] childNodes = listStatusWithRetries(rmDTSecretManagerRoot);
for(FileStatus childNodeStatus : childNodes) {
assert childNodeStatus.isFile();
String childNodeName = childNodeStatus.getPath().getName();
if (checkAndRemovePartialRecordWithRetries(childNodeStatus.getPath())) {
continue;
}
if(childNodeName.startsWith(DELEGATION_TOKEN_SEQUENCE_NUMBER_PREFIX)) {
rmState.rmSecretManagerState.dtSequenceNumber =
Integer.parseInt(childNodeName.split("_")[1]);
continue;
}
Path childNodePath = getNodePath(rmDTSecretManagerRoot, childNodeName);
byte[] childData = readFileWithRetries(childNodePath,
childNodeStatus.getLen());
ByteArrayInputStream is = new ByteArrayInputStream(childData);
try (DataInputStream fsIn = new DataInputStream(is)) {
if (childNodeName.startsWith(DELEGATION_KEY_PREFIX)) {
DelegationKey key = new DelegationKey();
key.readFields(fsIn);
rmState.rmSecretManagerState.masterKeyState.add(key);
if (LOG.isDebugEnabled()) {
LOG.debug("Loaded delegation key: keyId=" + key.getKeyId()
+ ", expirationDate=" + key.getExpiryDate());
}
} else if (childNodeName.startsWith(DELEGATION_TOKEN_PREFIX)) {
RMDelegationTokenIdentifierData identifierData =
new RMDelegationTokenIdentifierData();
identifierData.readFields(fsIn);
RMDelegationTokenIdentifier identifier =
identifierData.getTokenIdentifier();
long renewDate = identifierData.getRenewDate();
rmState.rmSecretManagerState.delegationTokenState.put(identifier,
renewDate);
if (LOG.isDebugEnabled()) {
LOG.debug("Loaded RMDelegationTokenIdentifier: " + identifier
+ " renewDate=" + renewDate);
}
} else {
LOG.warn("Unknown file for recovering RMDelegationTokenSecretManager");
}
}
}
}
@Override
public synchronized void storeApplicationStateInternal(ApplicationId appId,
ApplicationStateData appStateDataPB) throws Exception {
Path appDirPath = getAppDir(rmAppRoot, appId);
mkdirsWithRetries(appDirPath);
Path nodeCreatePath = getNodePath(appDirPath, appId.toString());
LOG.info("Storing info for app: " + appId + " at: " + nodeCreatePath);
byte[] appStateData = appStateDataPB.getProto().toByteArray();
try {
// currently throw all exceptions. May need to respond differently for HA
// based on whether we have lost the right to write to FS
writeFileWithRetries(nodeCreatePath, appStateData, true);
} catch (Exception e) {
LOG.info("Error storing info for app: " + appId, e);
throw e;
}
}
@Override
public synchronized void updateApplicationStateInternal(ApplicationId appId,
ApplicationStateData appStateDataPB) throws Exception {
Path appDirPath = getAppDir(rmAppRoot, appId);
Path nodeCreatePath = getNodePath(appDirPath, appId.toString());
LOG.info("Updating info for app: " + appId + " at: " + nodeCreatePath);
byte[] appStateData = appStateDataPB.getProto().toByteArray();
try {
// currently throw all exceptions. May need to respond differently for HA
// based on whether we have lost the right to write to FS
updateFile(nodeCreatePath, appStateData, true);
} catch (Exception e) {
LOG.info("Error updating info for app: " + appId, e);
throw e;
}
}
@Override
public synchronized void storeApplicationAttemptStateInternal(
ApplicationAttemptId appAttemptId,
ApplicationAttemptStateData attemptStateDataPB)
throws Exception {
Path appDirPath =
getAppDir(rmAppRoot, appAttemptId.getApplicationId());
Path nodeCreatePath = getNodePath(appDirPath, appAttemptId.toString());
LOG.info("Storing info for attempt: " + appAttemptId + " at: "
+ nodeCreatePath);
byte[] attemptStateData = attemptStateDataPB.getProto().toByteArray();
try {
// currently throw all exceptions. May need to respond differently for HA
// based on whether we have lost the right to write to FS
writeFileWithRetries(nodeCreatePath, attemptStateData, true);
} catch (Exception e) {
LOG.info("Error storing info for attempt: " + appAttemptId, e);
throw e;
}
}
@Override
public synchronized void updateApplicationAttemptStateInternal(
ApplicationAttemptId appAttemptId,
ApplicationAttemptStateData attemptStateDataPB)
throws Exception {
Path appDirPath =
getAppDir(rmAppRoot, appAttemptId.getApplicationId());
Path nodeCreatePath = getNodePath(appDirPath, appAttemptId.toString());
LOG.info("Updating info for attempt: " + appAttemptId + " at: "
+ nodeCreatePath);
byte[] attemptStateData = attemptStateDataPB.getProto().toByteArray();
try {
// currently throw all exceptions. May need to respond differently for HA
// based on whether we have lost the right to write to FS
updateFile(nodeCreatePath, attemptStateData, true);
} catch (Exception e) {
LOG.info("Error updating info for attempt: " + appAttemptId, e);
throw e;
}
}
@Override
public synchronized void removeApplicationStateInternal(
ApplicationStateData appState)
throws Exception {
ApplicationId appId =
appState.getApplicationSubmissionContext().getApplicationId();
Path nodeRemovePath = getAppDir(rmAppRoot, appId);
LOG.info("Removing info for app: " + appId + " at: " + nodeRemovePath);
deleteFileWithRetries(nodeRemovePath);
}
@Override
public synchronized void storeRMDelegationTokenState(
RMDelegationTokenIdentifier identifier, Long renewDate)
throws Exception {
storeOrUpdateRMDelegationTokenState(identifier, renewDate, false);
}
@Override
public synchronized void removeRMDelegationTokenState(
RMDelegationTokenIdentifier identifier) throws Exception {
Path nodeCreatePath = getNodePath(rmDTSecretManagerRoot,
DELEGATION_TOKEN_PREFIX + identifier.getSequenceNumber());
LOG.info("Removing RMDelegationToken_" + identifier.getSequenceNumber());
deleteFileWithRetries(nodeCreatePath);
}
@Override
protected synchronized void updateRMDelegationTokenState(
RMDelegationTokenIdentifier rmDTIdentifier, Long renewDate)
throws Exception {
storeOrUpdateRMDelegationTokenState(rmDTIdentifier, renewDate, true);
}
private void storeOrUpdateRMDelegationTokenState(
RMDelegationTokenIdentifier identifier, Long renewDate,
boolean isUpdate) throws Exception {
Path nodeCreatePath =
getNodePath(rmDTSecretManagerRoot,
DELEGATION_TOKEN_PREFIX + identifier.getSequenceNumber());
RMDelegationTokenIdentifierData identifierData =
new RMDelegationTokenIdentifierData(identifier, renewDate);
if (isUpdate) {
LOG.info("Updating RMDelegationToken_" + identifier.getSequenceNumber());
updateFile(nodeCreatePath, identifierData.toByteArray(), true);
} else {
LOG.info("Storing RMDelegationToken_" + identifier.getSequenceNumber());
writeFileWithRetries(nodeCreatePath, identifierData.toByteArray(), true);
// store sequence number
Path latestSequenceNumberPath = getNodePath(rmDTSecretManagerRoot,
DELEGATION_TOKEN_SEQUENCE_NUMBER_PREFIX
+ identifier.getSequenceNumber());
LOG.info("Storing " + DELEGATION_TOKEN_SEQUENCE_NUMBER_PREFIX
+ identifier.getSequenceNumber());
if (dtSequenceNumberPath == null) {
if (!createFileWithRetries(latestSequenceNumberPath)) {
throw new Exception("Failed to create " + latestSequenceNumberPath);
}
} else {
if (!renameFileWithRetries(dtSequenceNumberPath,
latestSequenceNumberPath)) {
throw new Exception("Failed to rename " + dtSequenceNumberPath);
}
}
dtSequenceNumberPath = latestSequenceNumberPath;
}
}
@Override
public synchronized void storeRMDTMasterKeyState(DelegationKey masterKey)
throws Exception {
Path nodeCreatePath = getNodePath(rmDTSecretManagerRoot,
DELEGATION_KEY_PREFIX + masterKey.getKeyId());
ByteArrayOutputStream os = new ByteArrayOutputStream();
try (DataOutputStream fsOut = new DataOutputStream(os)) {
LOG.info("Storing RMDelegationKey_" + masterKey.getKeyId());
masterKey.write(fsOut);
writeFileWithRetries(nodeCreatePath, os.toByteArray(), true);
}
}
@Override
public synchronized void
removeRMDTMasterKeyState(DelegationKey masterKey) throws Exception {
Path nodeCreatePath = getNodePath(rmDTSecretManagerRoot,
DELEGATION_KEY_PREFIX + masterKey.getKeyId());
LOG.info("Removing RMDelegationKey_"+ masterKey.getKeyId());
deleteFileWithRetries(nodeCreatePath);
}
@Override
public synchronized void deleteStore() throws Exception {
if (existsWithRetries(rootDirPath)) {
deleteFileWithRetries(rootDirPath);
}
}
private Path getAppDir(Path root, ApplicationId appId) {
return getNodePath(root, appId.toString());
}
@VisibleForTesting
protected Path getAppDir(ApplicationId appId) {
return getAppDir(rmAppRoot, appId);
}
@VisibleForTesting
protected Path getAppAttemptDir(ApplicationAttemptId appAttId) {
return getNodePath(getAppDir(appAttId.getApplicationId()), appAttId
.toString());
}
// FileSystem related code
private boolean checkAndRemovePartialRecordWithRetries(final Path record)
throws Exception {
return new FSAction<Boolean>() {
@Override
public Boolean run() throws Exception {
return checkAndRemovePartialRecord(record);
}
}.runWithRetries();
}
private void mkdirsWithRetries(final Path appDirPath) throws Exception {
new FSAction<Void>() {
@Override
public Void run() throws Exception {
fs.mkdirs(appDirPath);
return null;
}
}.runWithRetries();
}
private void writeFileWithRetries(final Path outputPath, final byte[] data,
final boolean makeUnreadableByAdmin)
throws Exception {
new FSAction<Void>() {
@Override
public Void run() throws Exception {
writeFile(outputPath, data, makeUnreadableByAdmin);
return null;
}
}.runWithRetries();
}
private void deleteFileWithRetries(final Path deletePath) throws Exception {
new FSAction<Void>() {
@Override
public Void run() throws Exception {
deleteFile(deletePath);
return null;
}
}.runWithRetries();
}
private boolean renameFileWithRetries(final Path src, final Path dst)
throws Exception {
return new FSAction<Boolean>() {
@Override
public Boolean run() throws Exception {
return renameFile(src, dst);
}
}.runWithRetries();
}
private boolean createFileWithRetries(final Path newFile) throws Exception {
return new FSAction<Boolean>() {
@Override
public Boolean run() throws Exception {
return createFile(newFile);
}
}.runWithRetries();
}
private FileStatus getFileStatusWithRetries(final Path path)
throws Exception {
return new FSAction<FileStatus>() {
@Override
public FileStatus run() throws Exception {
return getFileStatus(path);
}
}.runWithRetries();
}
private boolean existsWithRetries(final Path path) throws Exception {
return new FSAction<Boolean>() {
@Override
public Boolean run() throws Exception {
return fs.exists(path);
}
}.runWithRetries();
}
private byte[] readFileWithRetries(final Path inputPath, final long len)
throws Exception {
return new FSAction<byte[]>() {
@Override
public byte[] run() throws Exception {
return readFile(inputPath, len);
}
}.runWithRetries();
}
private FileStatus[] listStatusWithRetries(final Path path)
throws Exception {
return new FSAction<FileStatus[]>() {
@Override
public FileStatus[] run() throws Exception {
return fs.listStatus(path);
}
}.runWithRetries();
}
private FileStatus[] listStatusWithRetries(final Path path,
final PathFilter filter) throws Exception {
return new FSAction<FileStatus[]>() {
@Override
public FileStatus[] run() throws Exception {
return fs.listStatus(path, filter);
}
}.runWithRetries();
}
private void closeWithRetries() throws Exception {
new FSAction<Void>() {
@Override
public Void run() throws Exception {
if(fs!=null){
fs.close();
}
return null;
}
}.runWithRetries();
}
private abstract class FSAction<T> {
abstract T run() throws Exception;
T runWithRetries() throws Exception {
int retry = 0;
while (true) {
try {
return run();
} catch (IOException e) {
LOG.info("Exception while executing a FS operation.", e);
if (++retry > fsNumRetries) {
LOG.info("Maxed out FS retries. Giving up!");
throw e;
}
LOG.info("Retrying operation on FS. Retry no. " + retry);
Thread.sleep(fsRetryInterval);
}
}
}
}
private void deleteFile(Path deletePath) throws Exception {
if(!fs.delete(deletePath, true)) {
throw new Exception("Failed to delete " + deletePath);
}
}
private byte[] readFile(Path inputPath, long len) throws Exception {
FSDataInputStream fsIn = null;
try {
fsIn = fs.open(inputPath);
// state data will not be that "long"
byte[] data = new byte[(int) len];
fsIn.readFully(data);
return data;
} finally {
IOUtils.cleanup(LOG, fsIn);
}
}
private FileStatus getFileStatus(Path path) throws Exception {
try {
return fs.getFileStatus(path);
} catch (FileNotFoundException e) {
return null;
}
}
/*
* In order to make this write atomic as a part of write we will first write
* data to .tmp file and then rename it. Here we are assuming that rename is
* atomic for underlying file system.
*/
protected void writeFile(Path outputPath, byte[] data, boolean
makeUnradableByAdmin) throws Exception {
Path tempPath =
new Path(outputPath.getParent(), outputPath.getName() + ".tmp");
FSDataOutputStream fsOut = null;
// This file will be overwritten when app/attempt finishes for saving the
// final status.
try {
fsOut = fs.create(tempPath, true);
if (makeUnradableByAdmin) {
setUnreadableBySuperuserXattrib(tempPath);
}
fsOut.write(data);
fsOut.close();
fsOut = null;
fs.rename(tempPath, outputPath);
} finally {
IOUtils.cleanup(LOG, fsOut);
}
}
/*
* In order to make this update atomic as a part of write we will first write
* data to .new file and then rename it. Here we are assuming that rename is
* atomic for underlying file system.
*/
protected void updateFile(Path outputPath, byte[] data, boolean
makeUnradableByAdmin) throws Exception {
Path newPath = new Path(outputPath.getParent(), outputPath.getName() + ".new");
// use writeFileWithRetries to make sure .new file is created atomically
writeFileWithRetries(newPath, data, makeUnradableByAdmin);
replaceFile(newPath, outputPath);
}
protected void replaceFile(Path srcPath, Path dstPath) throws Exception {
if (existsWithRetries(dstPath)) {
deleteFileWithRetries(dstPath);
} else {
LOG.info("File doesn't exist. Skip deleting the file " + dstPath);
}
renameFileWithRetries(srcPath, dstPath);
}
@Private
@VisibleForTesting
boolean renameFile(Path src, Path dst) throws Exception {
return fs.rename(src, dst);
}
private boolean createFile(Path newFile) throws Exception {
return fs.createNewFile(newFile);
}
@Private
@VisibleForTesting
Path getNodePath(Path root, String nodeName) {
return new Path(root, nodeName);
}
@Override
public synchronized void storeOrUpdateAMRMTokenSecretManagerState(
AMRMTokenSecretManagerState amrmTokenSecretManagerState, boolean isUpdate)
throws Exception {
Path nodeCreatePath =
getNodePath(amrmTokenSecretManagerRoot, AMRMTOKEN_SECRET_MANAGER_NODE);
AMRMTokenSecretManagerState data =
AMRMTokenSecretManagerState.newInstance(amrmTokenSecretManagerState);
byte[] stateData = data.getProto().toByteArray();
if (isUpdate) {
updateFile(nodeCreatePath, stateData, true);
} else {
writeFileWithRetries(nodeCreatePath, stateData, true);
}
}
@VisibleForTesting
public int getNumRetries() {
return fsNumRetries;
}
@VisibleForTesting
public long getRetryInterval() {
return fsRetryInterval;
}
private void setUnreadableBySuperuserXattrib(Path p)
throws IOException {
if (fs.getScheme().toLowerCase().contains("hdfs")
&& intermediateEncryptionEnabled
&& !fs.getXAttrs(p).containsKey(UNREADABLE_BY_SUPERUSER_XATTRIB)) {
fs.setXAttr(p, UNREADABLE_BY_SUPERUSER_XATTRIB, null,
EnumSet.of(XAttrSetFlag.CREATE));
}
}
}