| /** |
| * |
| * 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.regionserver; |
| |
| import java.io.IOException; |
| import java.util.Map.Entry; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| import java.util.concurrent.locks.ReentrantLock; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.hbase.classification.InterfaceAudience; |
| import org.apache.hadoop.hbase.HConstants; |
| import org.apache.hadoop.hbase.RemoteExceptionHandler; |
| import org.apache.hadoop.hbase.Server; |
| import org.apache.hadoop.hbase.regionserver.wal.FailedLogCloseException; |
| import org.apache.hadoop.hbase.wal.WAL; |
| import org.apache.hadoop.hbase.regionserver.wal.WALActionsListener; |
| import org.apache.hadoop.hbase.util.Bytes; |
| import org.apache.hadoop.hbase.util.HasThread; |
| |
| import java.io.IOException; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| import java.util.concurrent.locks.ReentrantLock; |
| |
| import com.google.common.annotations.VisibleForTesting; |
| |
| /** |
| * Runs periodically to determine if the WAL should be rolled. |
| * |
| * NOTE: This class extends Thread rather than Chore because the sleep time |
| * can be interrupted when there is something to do, rather than the Chore |
| * sleep time which is invariant. |
| * |
| * TODO: change to a pool of threads |
| */ |
| @InterfaceAudience.Private |
| @VisibleForTesting |
| public class LogRoller extends HasThread { |
| static final Log LOG = LogFactory.getLog(LogRoller.class); |
| private final ReentrantLock rollLock = new ReentrantLock(); |
| private final AtomicBoolean rollLog = new AtomicBoolean(false); |
| private final ConcurrentHashMap<WAL, Boolean> walNeedsRoll = |
| new ConcurrentHashMap<WAL, Boolean>(); |
| private final Server server; |
| protected final RegionServerServices services; |
| private volatile long lastrolltime = System.currentTimeMillis(); |
| // Period to roll log. |
| private final long rollperiod; |
| private final int threadWakeFrequency; |
| |
| public void addWAL(final WAL wal) { |
| if (null == walNeedsRoll.putIfAbsent(wal, Boolean.FALSE)) { |
| wal.registerWALActionsListener(new WALActionsListener.Base() { |
| @Override |
| public void logRollRequested(boolean lowReplicas) { |
| walNeedsRoll.put(wal, Boolean.TRUE); |
| // TODO logs will contend with each other here, replace with e.g. DelayedQueue |
| synchronized(rollLog) { |
| rollLog.set(true); |
| rollLog.notifyAll(); |
| } |
| } |
| }); |
| } |
| } |
| |
| public void requestRollAll() { |
| for (WAL wal : walNeedsRoll.keySet()) { |
| walNeedsRoll.put(wal, Boolean.TRUE); |
| } |
| synchronized(rollLog) { |
| rollLog.set(true); |
| rollLog.notifyAll(); |
| } |
| } |
| |
| /** @param server */ |
| public LogRoller(final Server server, final RegionServerServices services) { |
| super("LogRoller"); |
| this.server = server; |
| this.services = services; |
| this.rollperiod = this.server.getConfiguration(). |
| getLong("hbase.regionserver.logroll.period", 3600000); |
| this.threadWakeFrequency = this.server.getConfiguration(). |
| getInt(HConstants.THREAD_WAKE_FREQUENCY, 10 * 1000); |
| } |
| |
| @Override |
| public void run() { |
| while (!server.isStopped()) { |
| long now = System.currentTimeMillis(); |
| boolean periodic = false; |
| if (!rollLog.get()) { |
| periodic = (now - this.lastrolltime) > this.rollperiod; |
| if (!periodic) { |
| synchronized (rollLog) { |
| try { |
| if (!rollLog.get()) rollLog.wait(this.threadWakeFrequency); |
| } catch (InterruptedException e) { |
| // Fall through |
| } |
| } |
| continue; |
| } |
| // Time for periodic roll |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("Wal roll period " + this.rollperiod + "ms elapsed"); |
| } |
| } else if (LOG.isDebugEnabled()) { |
| LOG.debug("WAL roll requested"); |
| } |
| rollLock.lock(); // FindBugs UL_UNRELEASED_LOCK_EXCEPTION_PATH |
| try { |
| this.lastrolltime = now; |
| for (Entry<WAL, Boolean> entry : walNeedsRoll.entrySet()) { |
| final WAL wal = entry.getKey(); |
| // Force the roll if the logroll.period is elapsed or if a roll was requested. |
| // The returned value is an array of actual region names. |
| final byte [][] regionsToFlush = wal.rollWriter(periodic || |
| entry.getValue().booleanValue()); |
| walNeedsRoll.put(wal, Boolean.FALSE); |
| if (regionsToFlush != null) { |
| for (byte [] r: regionsToFlush) scheduleFlush(r); |
| } |
| } |
| } catch (FailedLogCloseException e) { |
| server.abort("Failed log close in log roller", e); |
| } catch (java.net.ConnectException e) { |
| server.abort("Failed log close in log roller", e); |
| } catch (IOException ex) { |
| // Abort if we get here. We probably won't recover an IOE. HBASE-1132 |
| server.abort("IOE in log roller", |
| RemoteExceptionHandler.checkIOException(ex)); |
| } catch (Exception ex) { |
| LOG.error("Log rolling failed", ex); |
| server.abort("Log rolling failed", ex); |
| } finally { |
| try { |
| rollLog.set(false); |
| } finally { |
| rollLock.unlock(); |
| } |
| } |
| } |
| LOG.info("LogRoller exiting."); |
| } |
| |
| /** |
| * @param encodedRegionName Encoded name of region to flush. |
| */ |
| private void scheduleFlush(final byte [] encodedRegionName) { |
| boolean scheduled = false; |
| HRegion r = this.services.getFromOnlineRegions(Bytes.toString(encodedRegionName)); |
| FlushRequester requester = null; |
| if (r != null) { |
| requester = this.services.getFlushRequester(); |
| if (requester != null) { |
| requester.requestFlush(r); |
| scheduled = true; |
| } |
| } |
| if (!scheduled) { |
| LOG.warn("Failed to schedule flush of " + |
| Bytes.toString(encodedRegionName) + ", region=" + r + ", requester=" + |
| requester); |
| } |
| } |
| |
| } |