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/**
* 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.hbase.util;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InterruptedIOException;
import java.lang.reflect.Method;
import java.net.InetSocketAddress;
import java.net.URI;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.Collection;
import com.google.common.collect.Sets;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.hbase.classification.InterfaceStability;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.DistributedFileSystem;
import org.apache.hadoop.hdfs.server.namenode.LeaseExpiredException;
/**
* Implementation for hdfs
*/
@InterfaceAudience.Private
@InterfaceStability.Evolving
public class FSHDFSUtils extends FSUtils {
private static final Log LOG = LogFactory.getLog(FSHDFSUtils.class);
private static Class dfsUtilClazz;
private static Method getNNAddressesMethod;
/**
* @param fs
* @param conf
* @return A set containing all namenode addresses of fs
*/
private static Set getNNAddresses(DistributedFileSystem fs,
Configuration conf) {
Set addresses = new HashSet();
String serviceName = fs.getCanonicalServiceName();
if (serviceName.startsWith("ha-hdfs")) {
try {
if (dfsUtilClazz == null) {
dfsUtilClazz = Class.forName("org.apache.hadoop.hdfs.DFSUtil");
}
if (getNNAddressesMethod == null) {
try {
// getNNServiceRpcAddressesForCluster is available only in version
// equal to or later than Hadoop 2.6
getNNAddressesMethod =
dfsUtilClazz.getMethod("getNNServiceRpcAddressesForCluster", Configuration.class);
} catch (NoSuchMethodException e) {
// If hadoop version is older than hadoop 2.6
getNNAddressesMethod =
dfsUtilClazz.getMethod("getNNServiceRpcAddresses", Configuration.class);
}
}
Map> addressMap =
(Map>) getNNAddressesMethod
.invoke(null, conf);
String nameService = serviceName.substring(serviceName.indexOf(":") + 1);
if (addressMap.containsKey(nameService)) {
Map nnMap = addressMap.get(nameService);
for (Map.Entry e2 : nnMap.entrySet()) {
InetSocketAddress addr = e2.getValue();
addresses.add(addr);
}
}
} catch (Exception e) {
LOG.warn("DFSUtil.getNNServiceRpcAddresses failed. serviceName=" + serviceName, e);
}
} else {
URI uri = fs.getUri();
int port = uri.getPort();
if (port < 0) {
int idx = serviceName.indexOf(':');
port = Integer.parseInt(serviceName.substring(idx+1));
}
InetSocketAddress addr = new InetSocketAddress(uri.getHost(), port);
addresses.add(addr);
}
return addresses;
}
/**
* @param conf the Configuration of HBase
* @param srcFs
* @param desFs
* @return Whether srcFs and desFs are on same hdfs or not
*/
public static boolean isSameHdfs(Configuration conf, FileSystem srcFs, FileSystem desFs) {
// By getCanonicalServiceName, we could make sure both srcFs and desFs
// show a unified format which contains scheme, host and port.
String srcServiceName = srcFs.getCanonicalServiceName();
String desServiceName = desFs.getCanonicalServiceName();
if (srcServiceName == null || desServiceName == null) {
return false;
}
if (srcServiceName.equals(desServiceName)) {
return true;
}
if (srcServiceName.startsWith("ha-hdfs") && desServiceName.startsWith("ha-hdfs")) {
Collection internalNameServices =
conf.getTrimmedStringCollection("dfs.internal.nameservices");
if (!internalNameServices.isEmpty()) {
if (internalNameServices.contains(srcServiceName.split(":")[1])) {
return true;
} else {
return false;
}
}
}
if (srcFs instanceof DistributedFileSystem && desFs instanceof DistributedFileSystem) {
//If one serviceName is an HA format while the other is a non-HA format,
// maybe they refer to the same FileSystem.
//For example, srcFs is "ha-hdfs://nameservices" and desFs is "hdfs://activeNamenode:port"
Set srcAddrs = getNNAddresses((DistributedFileSystem) srcFs, conf);
Set desAddrs = getNNAddresses((DistributedFileSystem) desFs, conf);
if (Sets.intersection(srcAddrs, desAddrs).size() > 0) {
return true;
}
}
return false;
}
/**
* Recover the lease from HDFS, retrying multiple times.
*/
@Override
public void recoverFileLease(final FileSystem fs, final Path p,
Configuration conf, CancelableProgressable reporter)
throws IOException {
// lease recovery not needed for local file system case.
if (!(fs instanceof DistributedFileSystem)) return;
recoverDFSFileLease((DistributedFileSystem)fs, p, conf, reporter);
}
/*
* Run the dfs recover lease. recoverLease is asynchronous. It returns:
* -false when it starts the lease recovery (i.e. lease recovery not *yet* done)
* - true when the lease recovery has succeeded or the file is closed.
* But, we have to be careful. Each time we call recoverLease, it starts the recover lease
* process over from the beginning. We could put ourselves in a situation where we are
* doing nothing but starting a recovery, interrupting it to start again, and so on.
* The findings over in HBASE-8354 have it that the namenode will try to recover the lease
* on the file's primary node. If all is well, it should return near immediately. But,
* as is common, it is the very primary node that has crashed and so the namenode will be
* stuck waiting on a socket timeout before it will ask another datanode to start the
* recovery. It does not help if we call recoverLease in the meantime and in particular,
* subsequent to the socket timeout, a recoverLease invocation will cause us to start
* over from square one (possibly waiting on socket timeout against primary node). So,
* in the below, we do the following:
* 1. Call recoverLease.
* 2. If it returns true, break.
* 3. If it returns false, wait a few seconds and then call it again.
* 4. If it returns true, break.
* 5. If it returns false, wait for what we think the datanode socket timeout is
* (configurable) and then try again.
* 6. If it returns true, break.
* 7. If it returns false, repeat starting at step 5. above.
*
* If HDFS-4525 is available, call it every second and we might be able to exit early.
*/
boolean recoverDFSFileLease(final DistributedFileSystem dfs, final Path p,
final Configuration conf, final CancelableProgressable reporter)
throws IOException {
LOG.info("Recover lease on dfs file " + p);
long startWaiting = EnvironmentEdgeManager.currentTime();
// Default is 15 minutes. It's huge, but the idea is that if we have a major issue, HDFS
// usually needs 10 minutes before marking the nodes as dead. So we're putting ourselves
// beyond that limit 'to be safe'.
long recoveryTimeout = conf.getInt("hbase.lease.recovery.timeout", 900000) + startWaiting;
// This setting should be a little bit above what the cluster dfs heartbeat is set to.
long firstPause = conf.getInt("hbase.lease.recovery.first.pause", 4000);
// This should be set to how long it'll take for us to timeout against primary datanode if it
// is dead. We set it to 61 seconds, 1 second than the default READ_TIMEOUT in HDFS, the
// default value for DFS_CLIENT_SOCKET_TIMEOUT_KEY. If recovery is still failing after this
// timeout, then further recovery will take liner backoff with this base, to avoid endless
// preemptions when this value is not properly configured.
long subsequentPauseBase = conf.getLong("hbase.lease.recovery.dfs.timeout", 61 * 1000);
Method isFileClosedMeth = null;
// whether we need to look for isFileClosed method
boolean findIsFileClosedMeth = true;
boolean recovered = false;
// We break the loop if we succeed the lease recovery, timeout, or we throw an exception.
for (int nbAttempt = 0; !recovered; nbAttempt++) {
recovered = recoverLease(dfs, nbAttempt, p, startWaiting);
if (recovered) break;
checkIfCancelled(reporter);
if (checkIfTimedout(conf, recoveryTimeout, nbAttempt, p, startWaiting)) break;
try {
// On the first time through wait the short 'firstPause'.
if (nbAttempt == 0) {
Thread.sleep(firstPause);
} else {
// Cycle here until (subsequentPause * nbAttempt) elapses. While spinning, check
// isFileClosed if available (should be in hadoop 2.0.5... not in hadoop 1 though.
long localStartWaiting = EnvironmentEdgeManager.currentTime();
while ((EnvironmentEdgeManager.currentTime() - localStartWaiting) <
subsequentPauseBase * nbAttempt) {
Thread.sleep(conf.getInt("hbase.lease.recovery.pause", 1000));
if (findIsFileClosedMeth) {
try {
isFileClosedMeth = dfs.getClass().getMethod("isFileClosed",
new Class[]{ Path.class });
} catch (NoSuchMethodException nsme) {
LOG.debug("isFileClosed not available");
} finally {
findIsFileClosedMeth = false;
}
}
if (isFileClosedMeth != null && isFileClosed(dfs, isFileClosedMeth, p)) {
recovered = true;
break;
}
checkIfCancelled(reporter);
}
}
} catch (InterruptedException ie) {
InterruptedIOException iioe = new InterruptedIOException();
iioe.initCause(ie);
throw iioe;
}
}
return recovered;
}
boolean checkIfTimedout(final Configuration conf, final long recoveryTimeout,
final int nbAttempt, final Path p, final long startWaiting) {
if (recoveryTimeout < EnvironmentEdgeManager.currentTime()) {
LOG.warn("Cannot recoverLease after trying for " +
conf.getInt("hbase.lease.recovery.timeout", 900000) +
"ms (hbase.lease.recovery.timeout); continuing, but may be DATALOSS!!!; " +
getLogMessageDetail(nbAttempt, p, startWaiting));
return true;
}
return false;
}
/**
* Try to recover the lease.
* @param dfs
* @param nbAttempt
* @param p
* @param startWaiting
* @return True if dfs#recoverLease came by true.
* @throws FileNotFoundException
*/
boolean recoverLease(final DistributedFileSystem dfs, final int nbAttempt, final Path p,
final long startWaiting)
throws FileNotFoundException {
boolean recovered = false;
try {
recovered = dfs.recoverLease(p);
LOG.info((recovered? "Recovered lease, ": "Failed to recover lease, ") +
getLogMessageDetail(nbAttempt, p, startWaiting));
} catch (IOException e) {
if (e instanceof LeaseExpiredException && e.getMessage().contains("File does not exist")) {
// This exception comes out instead of FNFE, fix it
throw new FileNotFoundException("The given WAL wasn't found at " + p);
} else if (e instanceof FileNotFoundException) {
throw (FileNotFoundException)e;
}
LOG.warn(getLogMessageDetail(nbAttempt, p, startWaiting), e);
}
return recovered;
}
/**
* @param nbAttempt
* @param p
* @param startWaiting
* @return Detail to append to any log message around lease recovering.
*/
private String getLogMessageDetail(final int nbAttempt, final Path p, final long startWaiting) {
return "attempt=" + nbAttempt + " on file=" + p + " after " +
(EnvironmentEdgeManager.currentTime() - startWaiting) + "ms";
}
/**
* Call HDFS-4525 isFileClosed if it is available.
* @param dfs
* @param m
* @param p
* @return True if file is closed.
*/
private boolean isFileClosed(final DistributedFileSystem dfs, final Method m, final Path p) {
try {
return (Boolean) m.invoke(dfs, p);
} catch (SecurityException e) {
LOG.warn("No access", e);
} catch (Exception e) {
LOG.warn("Failed invocation for " + p.toString(), e);
}
return false;
}
void checkIfCancelled(final CancelableProgressable reporter)
throws InterruptedIOException {
if (reporter == null) return;
if (!reporter.progress()) throw new InterruptedIOException("Operation cancelled");
}
}
