HBASE-13790 Remove the DeleteTableHandler. (Jingcheng)
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anoopsjohn
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/**
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*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.hadoop.hbase.master.handler;
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import java.io.IOException;
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import java.io.InterruptedIOException;
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import java.util.ArrayList;
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import java.util.List;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.apache.hadoop.fs.FileSystem;
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import org.apache.hadoop.fs.Path;
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import org.apache.hadoop.hbase.*;
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import org.apache.hadoop.hbase.backup.HFileArchiver;
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import org.apache.hadoop.hbase.classification.InterfaceAudience;
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import org.apache.hadoop.hbase.client.ClusterConnection;
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import org.apache.hadoop.hbase.client.Delete;
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import org.apache.hadoop.hbase.client.Result;
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import org.apache.hadoop.hbase.client.ResultScanner;
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import org.apache.hadoop.hbase.client.Scan;
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import org.apache.hadoop.hbase.client.Table;
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import org.apache.hadoop.hbase.executor.EventType;
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import org.apache.hadoop.hbase.master.AssignmentManager;
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import org.apache.hadoop.hbase.master.HMaster;
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import org.apache.hadoop.hbase.master.MasterCoprocessorHost;
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import org.apache.hadoop.hbase.master.MasterFileSystem;
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import org.apache.hadoop.hbase.master.MasterServices;
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import org.apache.hadoop.hbase.master.RegionState.State;
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import org.apache.hadoop.hbase.mob.MobConstants;
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import org.apache.hadoop.hbase.mob.MobUtils;
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import org.apache.hadoop.hbase.master.RegionStates;
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import org.apache.hadoop.hbase.regionserver.HRegion;
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import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;
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import org.apache.hadoop.hbase.util.FSUtils;
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@InterfaceAudience.Private
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public class DeleteTableHandler extends TableEventHandler {
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private static final Log LOG = LogFactory.getLog(DeleteTableHandler.class);
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protected HTableDescriptor hTableDescriptor = null;
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public DeleteTableHandler(TableName tableName, Server server,
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final MasterServices masterServices) {
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super(EventType.C_M_DELETE_TABLE, tableName, server, masterServices);
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}
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@Override
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protected void prepareWithTableLock() throws IOException {
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// The next call fails if no such table.
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hTableDescriptor = getTableDescriptor().getHTableDescriptor();
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}
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protected void waitRegionInTransition(final List<HRegionInfo> regions)
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throws IOException, CoordinatedStateException {
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AssignmentManager am = this.masterServices.getAssignmentManager();
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RegionStates states = am.getRegionStates();
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long waitTime = server.getConfiguration().
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getLong("hbase.master.wait.on.region", 5 * 60 * 1000);
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for (HRegionInfo region : regions) {
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long done = EnvironmentEdgeManager.currentTime() + waitTime;
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while (EnvironmentEdgeManager.currentTime() < done) {
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if (states.isRegionInState(region, State.FAILED_OPEN)) {
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am.regionOffline(region);
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}
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if (!states.isRegionInTransition(region)) break;
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try {
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Thread.sleep(waitingTimeForEvents);
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} catch (InterruptedException e) {
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LOG.warn("Interrupted while sleeping");
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throw (InterruptedIOException)new InterruptedIOException().initCause(e);
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}
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LOG.debug("Waiting on region to clear regions in transition; "
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+ am.getRegionStates().getRegionTransitionState(region));
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}
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if (states.isRegionInTransition(region)) {
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throw new IOException("Waited hbase.master.wait.on.region (" +
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waitTime + "ms) for region to leave region " +
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region.getRegionNameAsString() + " in transitions");
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}
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}
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}
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@Override
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protected void handleTableOperation(List<HRegionInfo> regions)
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throws IOException, CoordinatedStateException {
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MasterCoprocessorHost cpHost = ((HMaster) this.server).getMasterCoprocessorHost();
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if (cpHost != null) {
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cpHost.preDeleteTableHandler(this.tableName);
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}
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// 1. Wait because of region in transition
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waitRegionInTransition(regions);
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// 2. Remove table from hbase:meta and HDFS
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removeTableData(regions);
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if (cpHost != null) {
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cpHost.postDeleteTableHandler(this.tableName);
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}
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((HMaster) this.server).getMasterQuotaManager().removeTableFromNamespaceQuota(tableName);
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}
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private void cleanupTableState() throws IOException {
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// 3. Update table descriptor cache
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LOG.debug("Removing '" + tableName + "' descriptor.");
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this.masterServices.getTableDescriptors().remove(tableName);
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AssignmentManager am = this.masterServices.getAssignmentManager();
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// 4. Clean up regions of the table in RegionStates.
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LOG.debug("Removing '" + tableName + "' from region states.");
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am.getRegionStates().tableDeleted(tableName);
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// 5.Clean any remaining rows for this table.
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cleanAnyRemainingRows();
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// 6. If entry for this table states, remove it.
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LOG.debug("Marking '" + tableName + "' as deleted.");
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am.getTableStateManager().setDeletedTable(tableName);
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}
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/**
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* There may be items for this table still up in hbase:meta in the case where the
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* info:regioninfo column was empty because of some write error. Remove ALL rows from hbase:meta
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* that have to do with this table. See HBASE-12980.
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* @throws IOException
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*/
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private void cleanAnyRemainingRows() throws IOException {
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ClusterConnection connection = this.masterServices.getConnection();
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Scan tableScan = MetaTableAccessor.getScanForTableName(connection, tableName);
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try (Table metaTable =
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connection.getTable(TableName.META_TABLE_NAME)) {
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List<Delete> deletes = new ArrayList<Delete>();
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try (ResultScanner resScanner = metaTable.getScanner(tableScan)) {
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for (Result result : resScanner) {
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deletes.add(new Delete(result.getRow()));
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}
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}
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if (!deletes.isEmpty()) {
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LOG.warn("Deleting some vestigal " + deletes.size() + " rows of " + this.tableName +
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" from " + TableName.META_TABLE_NAME);
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if (LOG.isDebugEnabled()) {
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for (Delete d: deletes) LOG.debug("Purging " + d);
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}
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metaTable.delete(deletes);
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}
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}
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}
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/**
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* Removes the table from hbase:meta and archives the HDFS files.
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*/
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protected void removeTableData(final List<HRegionInfo> regions)
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throws IOException, CoordinatedStateException {
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try {
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// 1. Remove regions from META
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LOG.debug("Deleting regions from META");
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MetaTableAccessor.deleteRegions(this.server.getConnection(), regions);
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// -----------------------------------------------------------------------
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// NOTE: At this point we still have data on disk, but nothing in hbase:meta
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// if the rename below fails, hbck will report an inconsistency.
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// -----------------------------------------------------------------------
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// 2. Move the table in /hbase/.tmp
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MasterFileSystem mfs = this.masterServices.getMasterFileSystem();
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Path tempTableDir = mfs.moveTableToTemp(tableName);
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// 3. Archive regions from FS (temp directory)
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FileSystem fs = mfs.getFileSystem();
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for (HRegionInfo hri : regions) {
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LOG.debug("Archiving region " + hri.getRegionNameAsString() + " from FS");
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HFileArchiver.archiveRegion(fs, mfs.getRootDir(),
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tempTableDir, HRegion.getRegionDir(tempTableDir, hri.getEncodedName()));
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}
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// Archive the mob data if there is a mob-enabled column
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boolean hasMob = MobUtils.hasMobColumns(hTableDescriptor);
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Path mobTableDir = null;
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if (hasMob) {
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// Archive mob data
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mobTableDir = FSUtils.getTableDir(new Path(mfs.getRootDir(), MobConstants.MOB_DIR_NAME),
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tableName);
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Path regionDir =
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new Path(mobTableDir, MobUtils.getMobRegionInfo(tableName).getEncodedName());
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if (fs.exists(regionDir)) {
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HFileArchiver.archiveRegion(fs, mfs.getRootDir(), mobTableDir, regionDir);
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}
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}
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// 4. Delete table directory from FS (temp directory)
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if (!fs.delete(tempTableDir, true)) {
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LOG.error("Couldn't delete " + tempTableDir);
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}
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// Delete the table directory where the mob files are saved
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if (hasMob && mobTableDir != null && fs.exists(mobTableDir)) {
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if (!fs.delete(mobTableDir, true)) {
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LOG.error("Couldn't delete " + mobTableDir);
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}
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}
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LOG.debug("Table '" + tableName + "' archived!");
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} finally {
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cleanupTableState();
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}
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}
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@Override
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protected void releaseTableLock() {
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super.releaseTableLock();
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try {
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masterServices.getTableLockManager().tableDeleted(tableName);
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} catch (IOException ex) {
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LOG.warn("Received exception from TableLockManager.tableDeleted:", ex); //not critical
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}
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}
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@Override
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public String toString() {
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String name = "UnknownServerName";
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if(server != null && server.getServerName() != null) {
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name = server.getServerName().toString();
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}
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return getClass().getSimpleName() + "-" + name + "-" + getSeqid() + "-" + tableName;
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}
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}
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@ -357,7 +357,6 @@ public class DeleteTableProcedure
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}
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}
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// Delete table directory from FS (temp directory)
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if (!fs.delete(tempTableDir, true) && fs.exists(tempTableDir)) {
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throw new IOException("Couldn't delete " + tempTableDir);
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@ -366,7 +365,7 @@ public class DeleteTableProcedure
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// Delete the table directory where the mob files are saved
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if (hasMob && mobTableDir != null && fs.exists(mobTableDir)) {
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if (!fs.delete(mobTableDir, true)) {
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LOG.error("Couldn't delete " + mobTableDir);
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throw new IOException("Couldn't delete mob dir " + mobTableDir);
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}
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}
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}
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