/**
* 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.chaos.actions;
import java.io.IOException;
import java.util.Random;
import org.apache.hadoop.hbase.HColumnDescriptor;
import org.apache.hadoop.hbase.HTableDescriptor;
import org.apache.hadoop.hbase.client.HBaseAdmin;
import org.apache.hadoop.hbase.io.compress.Compression.Algorithm;
import org.apache.hadoop.hbase.util.Bytes;
/**
* Action that changes the compression algorithm on a column family from a list of tables.
*/
public class ChangeCompressionAction extends Action {
private final byte[] tableName;
private final String tableNameString;
private HBaseAdmin admin;
private Random random;
public ChangeCompressionAction(String tableName) {
tableNameString = tableName;
this.tableName = Bytes.toBytes(tableName);
this.random = new Random();
}
@Override
public void init(ActionContext context) throws IOException {
super.init(context);
this.admin = context.getHBaseIntegrationTestingUtility().getHBaseAdmin();
}
@Override
public void perform() throws Exception {
HTableDescriptor tableDescriptor = admin.getTableDescriptor(tableName);
HColumnDescriptor[] columnDescriptors = tableDescriptor.getColumnFamilies();
if (columnDescriptors == null || columnDescriptors.length == 0) {
return;
}
// Possible compression algorithms. If an algorithm is not supported,
// modifyTable will fail, so there is no harm.
Algorithm[] possibleAlgos = Algorithm.values();
// Since not every compression algorithm is supported,
// let's use the same algorithm for all column families.
Algorithm algo = possibleAlgos[random.nextInt(possibleAlgos.length)];
LOG.debug("Performing action: Changing compression algorithms on "
+ tableNameString + " to " + algo);
for (HColumnDescriptor descriptor : columnDescriptors) {
if (random.nextBoolean()) {
descriptor.setCompactionCompressionType(algo);
} else {
descriptor.setCompressionType(algo);
}
}
admin.modifyTable(tableName, tableDescriptor);
}
}