/**
* 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.mapred;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hbase.HBaseTestingUtility;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
import org.apache.hadoop.hbase.testclassification.MediumTests;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.RecordWriter;
import org.junit.AfterClass;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;
import org.junit.experimental.categories.Category;
import java.io.IOException;
import static org.junit.Assert.fail;
/**
* Spark creates many instances of TableOutputFormat within a single process. We need to make
* sure we can have many instances and not leak connections.
*
* This test creates a few TableOutputFormats and shouldn't fail due to ZK connection exhaustion.
*/
@Category(MediumTests.class)
public class TestTableOutputFormatConnectionExhaust {
private static final Log LOG =
LogFactory.getLog(TestTableOutputFormatConnectionExhaust.class);
private final static HBaseTestingUtility UTIL = new HBaseTestingUtility();
static final String TABLE = "TestTableOutputFormatConnectionExhaust";
static final String FAMILY = "family";
@BeforeClass
public static void beforeClass() throws Exception {
// Default in ZookeeperMiniCluster is 1000, setting artificially low to trigger exhaustion.
// need min of 7 to properly start the default mini HBase cluster
UTIL.getConfiguration().setInt(HConstants.ZOOKEEPER_MAX_CLIENT_CNXNS, 10);
UTIL.startMiniCluster();
}
@AfterClass
public static void afterClass() throws Exception {
UTIL.shutdownMiniCluster();
}
@Before
public void before() throws IOException {
LOG.info("before");
UTIL.ensureSomeRegionServersAvailable(1);
LOG.info("before done");
}
/**
* Open and close a TableOutputFormat. The closing the RecordWriter should release HBase
* Connection (ZK) resources, and will throw exception if they are exhausted.
*/
static void openCloseTableOutputFormat(int iter) throws IOException {
LOG.info("Instantiating TableOutputFormat connection " + iter);
JobConf conf = new JobConf();
conf.addResource(UTIL.getConfiguration());
conf.set(TableOutputFormat.OUTPUT_TABLE, TABLE);
TableMapReduceUtil.initTableMapJob(TABLE, FAMILY, TableMap.class,
ImmutableBytesWritable.class, ImmutableBytesWritable.class, conf);
TableOutputFormat tof = new TableOutputFormat();
RecordWriter rw = tof.getRecordWriter(null, conf, TABLE, null);
rw.close(null);
}
@Test
public void testConnectionExhaustion() throws IOException {
int MAX_INSTANCES = 5; // fails on iteration 3 if zk connections leak
for (int i = 0; i < MAX_INSTANCES; i++) {
final int iter = i;
try {
openCloseTableOutputFormat(iter);
} catch (Exception e) {
LOG.error("Exception encountered", e);
fail("Failed on iteration " + i);
}
}
}
}