| /** |
| * Copyright The Apache Software Foundation |
| * |
| * 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 org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.hbase.classification.InterfaceAudience; |
| import org.apache.hadoop.hbase.DroppedSnapshotException; |
| import org.apache.hadoop.hbase.master.TableLockManager.TableLock; |
| import org.apache.hadoop.hbase.security.User; |
| import org.apache.hadoop.hbase.util.EnvironmentEdgeManager; |
| import org.apache.hadoop.ipc.RemoteException; |
| import org.apache.hadoop.util.StringUtils; |
| |
| import com.google.common.base.Preconditions; |
| |
| /** |
| * Handles processing region merges. Put in a queue, owned by HRegionServer. |
| */ |
| @InterfaceAudience.Private |
| class RegionMergeRequest implements Runnable { |
| private static final Log LOG = LogFactory.getLog(RegionMergeRequest.class); |
| private final HRegion region_a; |
| private final HRegion region_b; |
| private final HRegionServer server; |
| private final boolean forcible; |
| private TableLock tableLock; |
| private final long masterSystemTime; |
| private final User user; |
| |
| RegionMergeRequest(Region a, Region b, HRegionServer hrs, boolean forcible, |
| long masterSystemTime, User user) { |
| Preconditions.checkNotNull(hrs); |
| this.region_a = (HRegion)a; |
| this.region_b = (HRegion)b; |
| this.server = hrs; |
| this.forcible = forcible; |
| this.masterSystemTime = masterSystemTime; |
| this.user = user; |
| } |
| |
| @Override |
| public String toString() { |
| return "MergeRequest,regions:" + region_a + ", " + region_b + ", forcible=" |
| + forcible; |
| } |
| |
| @Override |
| public void run() { |
| if (this.server.isStopping() || this.server.isStopped()) { |
| LOG.debug("Skipping merge because server is stopping=" |
| + this.server.isStopping() + " or stopped=" + this.server.isStopped()); |
| return; |
| } |
| try { |
| final long startTime = EnvironmentEdgeManager.currentTime(); |
| RegionMergeTransactionImpl mt = new RegionMergeTransactionImpl(region_a, |
| region_b, forcible, masterSystemTime); |
| |
| //acquire a shared read lock on the table, so that table schema modifications |
| //do not happen concurrently |
| tableLock = server.getTableLockManager().readLock(region_a.getTableDesc().getTableName() |
| , "MERGE_REGIONS:" + region_a.getRegionInfo().getRegionNameAsString() + ", " + |
| region_b.getRegionInfo().getRegionNameAsString()); |
| try { |
| tableLock.acquire(); |
| } catch (IOException ex) { |
| tableLock = null; |
| throw ex; |
| } |
| |
| // If prepare does not return true, for some reason -- logged inside in |
| // the prepare call -- we are not ready to merge just now. Just return. |
| if (!mt.prepare(this.server)) return; |
| try { |
| mt.execute(this.server, this.server, this.user); |
| } catch (Exception e) { |
| if (this.server.isStopping() || this.server.isStopped()) { |
| LOG.info( |
| "Skip rollback/cleanup of failed merge of " + region_a + " and " |
| + region_b + " because server is" |
| + (this.server.isStopping() ? " stopping" : " stopped"), e); |
| return; |
| } |
| if (e instanceof DroppedSnapshotException) { |
| server.abort("Replay of WAL required. Forcing server shutdown", e); |
| return; |
| } |
| try { |
| LOG.warn("Running rollback/cleanup of failed merge of " |
| + region_a +" and "+ region_b + "; " + e.getMessage(), e); |
| if (mt.rollback(this.server, this.server)) { |
| LOG.info("Successful rollback of failed merge of " |
| + region_a +" and "+ region_b); |
| } else { |
| this.server.abort("Abort; we got an error after point-of-no-return" |
| + "when merging " + region_a + " and " + region_b); |
| } |
| } catch (RuntimeException ee) { |
| String msg = "Failed rollback of failed merge of " |
| + region_a +" and "+ region_b + " -- aborting server"; |
| // If failed rollback, kill this server to avoid having a hole in |
| // table. |
| LOG.info(msg, ee); |
| this.server.abort(msg); |
| } |
| return; |
| } |
| LOG.info("Regions merged, hbase:meta updated, and report to master. region_a=" |
| + region_a + ", region_b=" + region_b + ",merged region=" |
| + mt.getMergedRegionInfo().getRegionNameAsString() |
| + ". Region merge took " |
| + StringUtils.formatTimeDiff(EnvironmentEdgeManager.currentTime(), startTime)); |
| } catch (IOException ex) { |
| ex = ex instanceof RemoteException ? ((RemoteException) ex).unwrapRemoteException() : ex; |
| LOG.error("Merge failed " + this, ex); |
| server.checkFileSystem(); |
| } finally { |
| releaseTableLock(); |
| } |
| } |
| |
| protected void releaseTableLock() { |
| if (this.tableLock != null) { |
| try { |
| this.tableLock.release(); |
| } catch (IOException ex) { |
| LOG.error("Could not release the table lock (something is really wrong). " |
| + "Aborting this server to avoid holding the lock forever."); |
| this.server.abort("Abort; we got an error when releasing the table lock " |
| + "on " + region_a.getRegionInfo().getRegionNameAsString()); |
| } |
| } |
| } |
| } |