/**
*
* 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.master.handler;
import java.io.IOException;
import java.util.List;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.HRegionInfo;
import org.apache.hadoop.hbase.HTableDescriptor;
import org.apache.hadoop.hbase.Server;
import org.apache.hadoop.hbase.executor.EventType;
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.util.Bytes;
/**
* Handles adding a new family to an existing table.
*/
@InterfaceAudience.Private
public class TableDeleteFamilyHandler extends TableEventHandler {
private byte [] familyName;
public TableDeleteFamilyHandler(TableName tableName, byte [] familyName,
Server server, final MasterServices masterServices) throws IOException {
super(EventType.C_M_DELETE_FAMILY, tableName, server, masterServices);
this.familyName = familyName;
}
@Override
protected void prepareWithTableLock() throws IOException {
super.prepareWithTableLock();
HTableDescriptor htd = getTableDescriptor().getHTableDescriptor();
this.familyName = hasColumnFamily(htd, familyName);
}
@Override
protected void handleTableOperation(List<HRegionInfo> hris) throws IOException {
MasterCoprocessorHost cpHost = ((HMaster) this.server)
.getMasterCoprocessorHost();
if (cpHost != null) {
cpHost.preDeleteColumnHandler(this.tableName, this.familyName);
}
// Update table descriptor
this.masterServices.getMasterFileSystem().deleteColumn(tableName, familyName);
// Remove the column family from the file system
MasterFileSystem mfs = this.masterServices.getMasterFileSystem();
for (HRegionInfo hri : hris) {
// Delete the family directory in FS for all the regions one by one
mfs.deleteFamilyFromFS(hri, familyName);
}
if (cpHost != null) {
cpHost.postDeleteColumnHandler(this.tableName, this.familyName);
}
}
@Override
public String toString() {
String name = "UnknownServerName";
if(server != null && server.getServerName() != null) {
name = server.getServerName().toString();
}
String family = "UnknownFamily";
if(familyName != null) {
family = Bytes.toString(familyName);
}
return getClass().getSimpleName() + "-" + name + "-" + getSeqid() +
"-" + tableName + "-" + family;
}
}