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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.
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package org.apache.hadoop.hbase.master.handler;
import java.io.IOException;
import java.util.List;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.HRegionInfo;
import org.apache.hadoop.hbase.Server;
import org.apache.hadoop.hbase.backup.HFileArchiver;
import org.apache.hadoop.hbase.catalog.MetaEditor;
import org.apache.hadoop.hbase.executor.EventType;
import org.apache.hadoop.hbase.master.AssignmentManager;
import org.apache.hadoop.hbase.master.HMaster;
import org.apache.hadoop.hbase.master.MasterCoprocessorHost;
import org.apache.hadoop.hbase.master.MasterFileSystem;
import org.apache.hadoop.hbase.master.MasterServices;
import org.apache.hadoop.hbase.master.RegionStates;
import org.apache.hadoop.hbase.master.RegionState.State;
import org.apache.hadoop.hbase.util.Threads;
import org.apache.zookeeper.KeeperException;
@InterfaceAudience.Private
public class DeleteTableHandler extends TableEventHandler {
private static final Log LOG = LogFactory.getLog(DeleteTableHandler.class);
public DeleteTableHandler(TableName tableName, Server server,
final MasterServices masterServices) {
super(EventType.C_M_DELETE_TABLE, tableName, server, masterServices);
}
@Override
protected void prepareWithTableLock() throws IOException {
// The next call fails if no such table.
getTableDescriptor();
}
@Override
protected void handleTableOperation(List<HRegionInfo> regions)
throws IOException, KeeperException {
MasterCoprocessorHost cpHost = ((HMaster) this.server)
.getCoprocessorHost();
if (cpHost != null) {
cpHost.preDeleteTableHandler(this.tableName);
}
// 1. Wait because of region in transition
AssignmentManager am = this.masterServices.getAssignmentManager();
RegionStates states = am.getRegionStates();
long waitTime = server.getConfiguration().
getLong("hbase.master.wait.on.region", 5 * 60 * 1000);
for (HRegionInfo region : regions) {
long done = System.currentTimeMillis() + waitTime;
while (System.currentTimeMillis() < done) {
if (states.isRegionInState(region, State.FAILED_OPEN)) {
am.regionOffline(region);
}
if (!states.isRegionInTransition(region)) break;
Threads.sleep(waitingTimeForEvents);
LOG.debug("Waiting on region to clear regions in transition; "
+ am.getRegionStates().getRegionTransitionState(region));
}
if (states.isRegionInTransition(region)) {
throw new IOException("Waited hbase.master.wait.on.region (" +
waitTime + "ms) for region to leave region " +
region.getRegionNameAsString() + " in transitions");
}
}
// 2. Remove regions from META
LOG.debug("Deleting regions from META");
MetaEditor.deleteRegions(this.server.getCatalogTracker(), regions);
// 3. Move the table in /hbase/.tmp
MasterFileSystem mfs = this.masterServices.getMasterFileSystem();
Path tempTableDir = mfs.moveTableToTemp(tableName);
try {
// 4. Delete regions from FS (temp directory)
FileSystem fs = mfs.getFileSystem();
for (HRegionInfo hri: regions) {
LOG.debug("Archiving region " + hri.getRegionNameAsString() + " from FS");
HFileArchiver.archiveRegion(fs, mfs.getRootDir(),
tempTableDir, new Path(tempTableDir, hri.getEncodedName()));
}
// 5. Delete table from FS (temp directory)
if (!fs.delete(tempTableDir, true)) {
LOG.error("Couldn't delete " + tempTableDir);
}
LOG.debug("Table '" + tableName + "' archived!");
} finally {
// 6. Update table descriptor cache
LOG.debug("Removing '" + tableName + "' descriptor.");
this.masterServices.getTableDescriptors().remove(tableName);
// 7. If entry for this table in zk, and up in AssignmentManager, remove it.
LOG.debug("Marking '" + tableName + "' as deleted.");
am.getZKTable().setDeletedTable(tableName);
}
if (cpHost != null) {
cpHost.postDeleteTableHandler(this.tableName);
}
}
@Override
protected void releaseTableLock() {
super.releaseTableLock();
try {
masterServices.getTableLockManager().tableDeleted(tableName);
} catch (IOException ex) {
LOG.warn("Received exception from TableLockManager.tableDeleted:", ex); //not critical
}
}
@Override
public String toString() {
String name = "UnknownServerName";
if(server != null && server.getServerName() != null) {
name = server.getServerName().toString();
}
return getClass().getSimpleName() + "-" + name + "-" + getSeqid() + "-" + tableName;
}
}