/**
*
* 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;
import static org.junit.Assert.assertEquals;
import java.io.IOException;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hbase.HBaseTestingUtility;
import org.apache.hadoop.hbase.HRegionInfo;
import org.apache.hadoop.hbase.testclassification.MediumTests;
import org.apache.hadoop.hbase.MiniHBaseCluster;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.ServerName;
import org.apache.hadoop.hbase.client.Admin;
import org.apache.hadoop.hbase.client.HTable;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.client.Table;
import org.apache.hadoop.hbase.regionserver.HRegion;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.util.JVMClusterUtil;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;
import org.junit.experimental.categories.Category;
@Category(MediumTests.class)
public class TestAssignmentListener {
private static final Log LOG = LogFactory.getLog(TestAssignmentListener.class);
private static final HBaseTestingUtility TEST_UTIL = new HBaseTestingUtility();
static class DummyListener {
protected AtomicInteger modified = new AtomicInteger(0);
public void awaitModifications(int count) throws InterruptedException {
while (!modified.compareAndSet(count, 0)) {
Thread.sleep(100);
}
}
}
static class DummyAssignmentListener extends DummyListener implements AssignmentListener {
private AtomicInteger closeCount = new AtomicInteger(0);
private AtomicInteger openCount = new AtomicInteger(0);
public DummyAssignmentListener() {
}
@Override
public void regionOpened(final HRegionInfo regionInfo, final ServerName serverName) {
LOG.info("Assignment open region=" + regionInfo + " server=" + serverName);
openCount.incrementAndGet();
modified.incrementAndGet();
}
@Override
public void regionClosed(final HRegionInfo regionInfo) {
LOG.info("Assignment close region=" + regionInfo);
closeCount.incrementAndGet();
modified.incrementAndGet();
}
public void reset() {
openCount.set(0);
closeCount.set(0);
}
public int getLoadCount() {
return openCount.get();
}
public int getCloseCount() {
return closeCount.get();
}
}
static class DummyServerListener extends DummyListener implements ServerListener {
private AtomicInteger removedCount = new AtomicInteger(0);
private AtomicInteger addedCount = new AtomicInteger(0);
public DummyServerListener() {
}
@Override
public void serverAdded(final ServerName serverName) {
LOG.info("Server added " + serverName);
addedCount.incrementAndGet();
modified.incrementAndGet();
}
@Override
public void serverRemoved(final ServerName serverName) {
LOG.info("Server removed " + serverName);
removedCount.incrementAndGet();
modified.incrementAndGet();
}
public void reset() {
addedCount.set(0);
removedCount.set(0);
}
public int getAddedCount() {
return addedCount.get();
}
public int getRemovedCount() {
return removedCount.get();
}
}
@BeforeClass
public static void beforeAllTests() throws Exception {
TEST_UTIL.startMiniCluster(2);
}
@AfterClass
public static void afterAllTests() throws Exception {
TEST_UTIL.shutdownMiniCluster();
}
@Test(timeout=60000)
public void testServerListener() throws IOException, InterruptedException {
ServerManager serverManager = TEST_UTIL.getHBaseCluster().getMaster().getServerManager();
DummyServerListener listener = new DummyServerListener();
serverManager.registerListener(listener);
try {
MiniHBaseCluster miniCluster = TEST_UTIL.getMiniHBaseCluster();
// Start a new Region Server
miniCluster.startRegionServer();
listener.awaitModifications(1);
assertEquals(1, listener.getAddedCount());
assertEquals(0, listener.getRemovedCount());
// Start another Region Server
listener.reset();
miniCluster.startRegionServer();
listener.awaitModifications(1);
assertEquals(1, listener.getAddedCount());
assertEquals(0, listener.getRemovedCount());
int nrs = miniCluster.getRegionServerThreads().size();
// Stop a Region Server
listener.reset();
miniCluster.stopRegionServer(nrs - 1);
listener.awaitModifications(1);
assertEquals(0, listener.getAddedCount());
assertEquals(1, listener.getRemovedCount());
// Stop another Region Server
listener.reset();
miniCluster.stopRegionServer(nrs - 2);
listener.awaitModifications(1);
assertEquals(0, listener.getAddedCount());
assertEquals(1, listener.getRemovedCount());
} finally {
serverManager.unregisterListener(listener);
}
}
@Test(timeout=60000)
public void testAssignmentListener() throws IOException, InterruptedException {
AssignmentManager am = TEST_UTIL.getHBaseCluster().getMaster().getAssignmentManager();
Admin admin = TEST_UTIL.getHBaseAdmin();
DummyAssignmentListener listener = new DummyAssignmentListener();
am.registerListener(listener);
try {
final String TABLE_NAME_STR = "testtb";
final TableName TABLE_NAME = TableName.valueOf(TABLE_NAME_STR);
final byte[] FAMILY = Bytes.toBytes("cf");
// Create a new table, with a single region
LOG.info("Create Table");
TEST_UTIL.createTable(TABLE_NAME, FAMILY);
listener.awaitModifications(1);
assertEquals(1, listener.getLoadCount());
assertEquals(0, listener.getCloseCount());
// Add some data
Table table = new HTable(TEST_UTIL.getConfiguration(), TABLE_NAME);
try {
for (int i = 0; i < 10; ++i) {
byte[] key = Bytes.toBytes("row-" + i);
Put put = new Put(key);
put.add(FAMILY, null, key);
table.put(put);
}
} finally {
table.close();
}
// Split the table in two
LOG.info("Split Table");
listener.reset();
admin.split(TABLE_NAME, Bytes.toBytes("row-3"));
listener.awaitModifications(3);
assertEquals(2, listener.getLoadCount()); // daughters added
assertEquals(1, listener.getCloseCount()); // parent removed
// Wait for the Regions to be mergeable
MiniHBaseCluster miniCluster = TEST_UTIL.getMiniHBaseCluster();
int mergeable = 0;
while (mergeable < 2) {
Thread.sleep(100);
admin.majorCompact(TABLE_NAME);
mergeable = 0;
for (JVMClusterUtil.RegionServerThread regionThread: miniCluster.getRegionServerThreads()) {
for (HRegion region: regionThread.getRegionServer().getOnlineRegions(TABLE_NAME)) {
mergeable += region.isMergeable() ? 1 : 0;
}
}
}
// Merge the two regions
LOG.info("Merge Regions");
listener.reset();
List<HRegionInfo> regions = admin.getTableRegions(TABLE_NAME);
assertEquals(2, regions.size());
admin.mergeRegions(regions.get(0).getEncodedNameAsBytes(),
regions.get(1).getEncodedNameAsBytes(), true);
listener.awaitModifications(3);
assertEquals(1, admin.getTableRegions(TABLE_NAME).size());
assertEquals(1, listener.getLoadCount()); // new merged region added
assertEquals(2, listener.getCloseCount()); // daughters removed
// Delete the table
LOG.info("Drop Table");
listener.reset();
TEST_UTIL.deleteTable(TABLE_NAME);
listener.awaitModifications(1);
assertEquals(0, listener.getLoadCount());
assertEquals(1, listener.getCloseCount());
} finally {
am.unregisterListener(listener);
}
}
}