/**
* Copyright 2007 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.util.ArrayList;
import java.util.List;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hbase.client.HTable;
import org.apache.hadoop.hbase.client.HBaseAdmin;
import org.apache.hadoop.hbase.HBaseClusterTestCase;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.HTableDescriptor;
import org.apache.hadoop.hbase.HColumnDescriptor;
import org.apache.hadoop.hbase.io.BatchUpdate;
import org.apache.hadoop.hbase.util.Bytes;
/**
* Test log deletion as logs are rolled.
*/
public class TestLogRolling extends HBaseClusterTestCase {
private static final Log LOG = LogFactory.getLog(TestLogRolling.class);
private HRegionServer server;
private HLog log;
private String tableName;
private byte[] value;
/**
* constructor
* @throws Exception
*/
public TestLogRolling() throws Exception {
// start one regionserver and a minidfs.
super();
try {
this.server = null;
this.log = null;
this.tableName = null;
this.value = null;
String className = this.getClass().getName();
StringBuilder v = new StringBuilder(className);
while (v.length() < 1000) {
v.append(className);
}
value = Bytes.toBytes(v.toString());
} catch (Exception e) {
LOG.fatal("error in constructor", e);
throw e;
}
}
// Need to override this setup so we can edit the config before it gets sent
// to the cluster startup.
@Override
protected void preHBaseClusterSetup() {
// Force a region split after every 768KB
conf.setLong("hbase.hregion.max.filesize", 768L * 1024L);
// We roll the log after every 32 writes
conf.setInt("hbase.regionserver.maxlogentries", 32);
// For less frequently updated regions flush after every 2 flushes
conf.setInt("hbase.hregion.memcache.optionalflushcount", 2);
// We flush the cache after every 8192 bytes
conf.setInt("hbase.hregion.memcache.flush.size", 8192);
// Make lease timeout longer, lease checks less frequent
conf.setInt("hbase.master.lease.period", 10 * 1000);
conf.setInt("hbase.master.lease.thread.wakefrequency", 5 * 1000);
// Increase the amount of time between client retries
conf.setLong("hbase.client.pause", 15 * 1000);
// Reduce thread wake frequency so that other threads can get
// a chance to run.
conf.setInt(HConstants.THREAD_WAKE_FREQUENCY, 2 * 1000);
}
private void startAndWriteData() throws Exception {
// When the META table can be opened, the region servers are running
new HTable(conf, HConstants.META_TABLE_NAME);
this.server = cluster.getRegionThreads().get(0).getRegionServer();
this.log = server.getLog();
// Create the test table and open it
HTableDescriptor desc = new HTableDescriptor(tableName);
desc.addFamily(new HColumnDescriptor(HConstants.COLUMN_FAMILY));
HBaseAdmin admin = new HBaseAdmin(conf);
admin.createTable(desc);
HTable table = new HTable(conf, tableName);
for (int i = 1; i <= 256; i++) { // 256 writes should cause 8 log rolls
BatchUpdate b =
new BatchUpdate("row" + String.format("%1$04d", i));
b.put(HConstants.COLUMN_FAMILY, value);
table.commit(b);
if (i % 32 == 0) {
// After every 32 writes sleep to let the log roller run
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
// continue
}
}
}
}
/**
* Tests that logs are deleted
*
* @throws Exception
*/
public void testLogRolling() throws Exception {
tableName = getName();
try {
startAndWriteData();
LOG.info("after writing there are " + log.getNumLogFiles() + " log files");
// flush all regions
List<HRegion> regions =
new ArrayList<HRegion>(server.getOnlineRegions());
for (HRegion r: regions) {
r.flushcache();
}
// Now roll the log
log.rollWriter();
int count = log.getNumLogFiles();
LOG.info("after flushing all regions and rolling logs there are " +
log.getNumLogFiles() + " log files");
assertTrue(("actual count: " + count), count <= 2);
} catch (Exception e) {
LOG.fatal("unexpected exception", e);
throw e;
}
}
}