| /** |
| * 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<InetSocketAddress> getNNAddresses(DistributedFileSystem fs, |
| Configuration conf) { |
| Set<InetSocketAddress> addresses = new HashSet<InetSocketAddress>(); |
| 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<String, Map<String, InetSocketAddress>> addressMap = |
| (Map<String, Map<String, InetSocketAddress>>) getNNAddressesMethod |
| .invoke(null, conf); |
| for (Map.Entry<String, Map<String, InetSocketAddress>> entry : addressMap.entrySet()) { |
| Map<String, InetSocketAddress> nnMap = entry.getValue(); |
| for (Map.Entry<String, InetSocketAddress> 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<String> 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<InetSocketAddress> srcAddrs = getNNAddresses((DistributedFileSystem) srcFs, conf); |
| Set<InetSocketAddress> 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"); |
| } |
| } |
