/**
* Copyright 2010 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.master;
import java.io.IOException;
import java.util.Collection;
import java.util.concurrent.atomic.AtomicBoolean;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseTestingUtility;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.HRegionInfo;
import org.apache.hadoop.hbase.MiniHBaseCluster;
import org.apache.hadoop.hbase.client.HTable;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.client.ResultScanner;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.hadoop.hbase.executor.EventHandler;
import org.apache.hadoop.hbase.executor.EventHandler.EventHandlerListener;
import org.apache.hadoop.hbase.executor.EventHandler.EventType;
import org.apache.hadoop.hbase.master.handler.TotesHRegionInfo;
import org.apache.hadoop.hbase.regionserver.HRegionServer;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.util.Threads;
import org.apache.hadoop.hbase.util.Writables;
import org.junit.AfterClass;
import org.junit.Assert;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;
/**
* Test open and close of regions using zk.
*/
public class TestZKBasedOpenCloseRegion {
private static final Log LOG = LogFactory.getLog(TestZKBasedOpenCloseRegion.class);
private static final HBaseTestingUtility TEST_UTIL = new HBaseTestingUtility();
private static final String TABLENAME = "TestZKBasedOpenCloseRegion";
private static final byte [][] FAMILIES = new byte [][] {Bytes.toBytes("a"),
Bytes.toBytes("b"), Bytes.toBytes("c")};
@BeforeClass public static void beforeAllTests() throws Exception {
Configuration c = TEST_UTIL.getConfiguration();
c.setBoolean("dfs.support.append", true);
c.setInt("hbase.regionserver.info.port", 0);
TEST_UTIL.startMiniCluster(2);
TEST_UTIL.createTable(Bytes.toBytes(TABLENAME), FAMILIES);
HTable t = new HTable(TEST_UTIL.getConfiguration(), TABLENAME);
int countOfRegions = TEST_UTIL.createMultiRegions(t, getTestFamily());
waitUntilAllRegionsAssigned(countOfRegions);
addToEachStartKey(countOfRegions);
}
@AfterClass public static void afterAllTests() throws IOException {
TEST_UTIL.shutdownMiniCluster();
}
@Before public void setup() throws IOException {
if (TEST_UTIL.getHBaseCluster().getLiveRegionServerThreads().size() < 2) {
// Need at least two servers.
LOG.info("Started new server=" +
TEST_UTIL.getHBaseCluster().startRegionServer());
}
}
/**
* Test we reopen a region once closed.
* @throws Exception
*/
@Test (timeout=300000) public void testReOpenRegion()
throws Exception {
MiniHBaseCluster cluster = TEST_UTIL.getHBaseCluster();
LOG.info("Number of region servers = " +
cluster.getLiveRegionServerThreads().size());
int rsIdx = 0;
HRegionServer regionServer =
TEST_UTIL.getHBaseCluster().getRegionServer(rsIdx);
HRegionInfo hri = getNonMetaRegion(regionServer.getOnlineRegions());
LOG.debug("Asking RS to close region " + hri.getRegionNameAsString());
AtomicBoolean closeEventProcessed = new AtomicBoolean(false);
AtomicBoolean reopenEventProcessed = new AtomicBoolean(false);
EventHandlerListener closeListener =
new ReopenEventListener(hri.getRegionNameAsString(),
closeEventProcessed, EventType.RS_ZK_REGION_CLOSED);
cluster.getMaster().executorService.
registerListener(EventType.RS_ZK_REGION_CLOSED, closeListener);
EventHandlerListener openListener =
new ReopenEventListener(hri.getRegionNameAsString(),
reopenEventProcessed, EventType.RS_ZK_REGION_OPENED);
cluster.getMaster().executorService.
registerListener(EventType.RS_ZK_REGION_OPENED, openListener);
LOG.info("Unassign " + hri.getRegionNameAsString());
cluster.getMaster().assignmentManager.unassign(hri);
while (!closeEventProcessed.get()) {
Threads.sleep(100);
}
while (!reopenEventProcessed.get()) {
Threads.sleep(100);
}
LOG.info("Done with testReOpenRegion");
}
private HRegionInfo getNonMetaRegion(final Collection<HRegionInfo> regions) {
HRegionInfo hri = null;
for (HRegionInfo i: regions) {
LOG.info(i.getRegionNameAsString());
if (!i.isMetaRegion()) {
hri = i;
break;
}
}
return hri;
}
public static class ReopenEventListener implements EventHandlerListener {
private static final Log LOG = LogFactory.getLog(ReopenEventListener.class);
String regionName;
AtomicBoolean eventProcessed;
EventType eventType;
public ReopenEventListener(String regionName,
AtomicBoolean eventProcessed, EventType eventType) {
this.regionName = regionName;
this.eventProcessed = eventProcessed;
this.eventType = eventType;
}
@Override
public void beforeProcess(EventHandler event) {
if(event.getEventType() == eventType) {
LOG.info("Received " + eventType + " and beginning to process it");
}
}
@Override
public void afterProcess(EventHandler event) {
LOG.info("afterProcess(" + event + ")");
if(event.getEventType() == eventType) {
LOG.info("Finished processing " + eventType);
String regionName = "";
if(eventType == EventType.RS_ZK_REGION_OPENED) {
TotesHRegionInfo hriCarrier = (TotesHRegionInfo)event;
regionName = hriCarrier.getHRegionInfo().getRegionNameAsString();
} else if(eventType == EventType.RS_ZK_REGION_CLOSED) {
TotesHRegionInfo hriCarrier = (TotesHRegionInfo)event;
regionName = hriCarrier.getHRegionInfo().getRegionNameAsString();
}
if(this.regionName.equals(regionName)) {
eventProcessed.set(true);
}
synchronized(eventProcessed) {
eventProcessed.notifyAll();
}
}
}
}
@Test (timeout=300000) public void testCloseRegion()
throws Exception {
LOG.info("Running testCloseRegion");
MiniHBaseCluster cluster = TEST_UTIL.getHBaseCluster();
LOG.info("Number of region servers = " + cluster.getLiveRegionServerThreads().size());
int rsIdx = 0;
HRegionServer regionServer = TEST_UTIL.getHBaseCluster().getRegionServer(rsIdx);
HRegionInfo hri = getNonMetaRegion(regionServer.getOnlineRegions());
LOG.debug("Asking RS to close region " + hri.getRegionNameAsString());
AtomicBoolean closeEventProcessed = new AtomicBoolean(false);
EventHandlerListener listener =
new CloseRegionEventListener(hri.getRegionNameAsString(),
closeEventProcessed);
cluster.getMaster().executorService.registerListener(EventType.RS_ZK_REGION_CLOSED, listener);
cluster.getMaster().assignmentManager.unassign(hri);
while (!closeEventProcessed.get()) {
Threads.sleep(100);
}
LOG.info("Done with testCloseRegion");
}
public static class CloseRegionEventListener implements EventHandlerListener {
private static final Log LOG = LogFactory.getLog(CloseRegionEventListener.class);
String regionToClose;
AtomicBoolean closeEventProcessed;
public CloseRegionEventListener(String regionToClose,
AtomicBoolean closeEventProcessed) {
this.regionToClose = regionToClose;
this.closeEventProcessed = closeEventProcessed;
}
@Override
public void afterProcess(EventHandler event) {
LOG.info("afterProcess(" + event + ")");
if(event.getEventType() == EventType.RS_ZK_REGION_CLOSED) {
LOG.info("Finished processing CLOSE REGION");
TotesHRegionInfo hriCarrier = (TotesHRegionInfo)event;
if (regionToClose.equals(hriCarrier.getHRegionInfo().getRegionNameAsString())) {
LOG.info("Setting closeEventProcessed flag");
closeEventProcessed.set(true);
} else {
LOG.info("Region to close didn't match");
}
}
}
@Override
public void beforeProcess(EventHandler event) {
if(event.getEventType() == EventType.M_RS_CLOSE_REGION) {
LOG.info("Received CLOSE RPC and beginning to process it");
}
}
}
private static void waitUntilAllRegionsAssigned(final int countOfRegions)
throws IOException {
HTable meta = new HTable(TEST_UTIL.getConfiguration(),
HConstants.META_TABLE_NAME);
while (true) {
int rows = 0;
Scan scan = new Scan();
scan.addColumn(HConstants.CATALOG_FAMILY, HConstants.SERVER_QUALIFIER);
ResultScanner s = meta.getScanner(scan);
for (Result r = null; (r = s.next()) != null;) {
byte [] b =
r.getValue(HConstants.CATALOG_FAMILY, HConstants.SERVER_QUALIFIER);
if (b == null || b.length <= 0) {
break;
}
rows++;
}
s.close();
// If I get to here and all rows have a Server, then all have been assigned.
if (rows == countOfRegions) {
break;
}
LOG.info("Found=" + rows);
Threads.sleep(1000);
}
}
/*
* Add to each of the regions in .META. a value. Key is the startrow of the
* region (except its 'aaa' for first region). Actual value is the row name.
* @param expected
* @return
* @throws IOException
*/
private static int addToEachStartKey(final int expected) throws IOException {
HTable t = new HTable(TEST_UTIL.getConfiguration(), TABLENAME);
HTable meta = new HTable(TEST_UTIL.getConfiguration(),
HConstants.META_TABLE_NAME);
int rows = 0;
Scan scan = new Scan();
scan.addColumn(HConstants.CATALOG_FAMILY, HConstants.REGIONINFO_QUALIFIER);
ResultScanner s = meta.getScanner(scan);
for (Result r = null; (r = s.next()) != null;) {
byte [] b =
r.getValue(HConstants.CATALOG_FAMILY, HConstants.REGIONINFO_QUALIFIER);
if (b == null || b.length <= 0) {
break;
}
HRegionInfo hri = Writables.getHRegionInfo(b);
// If start key, add 'aaa'.
byte [] row = getStartKey(hri);
Put p = new Put(row);
p.add(getTestFamily(), getTestQualifier(), row);
t.put(p);
rows++;
}
s.close();
Assert.assertEquals(expected, rows);
return rows;
}
private static byte [] getStartKey(final HRegionInfo hri) {
return Bytes.equals(HConstants.EMPTY_START_ROW, hri.getStartKey())?
Bytes.toBytes("aaa"): hri.getStartKey();
}
private static byte [] getTestFamily() {
return FAMILIES[0];
}
private static byte [] getTestQualifier() {
return getTestFamily();
}
public static void main(String args[]) throws Exception {
TestZKBasedOpenCloseRegion.beforeAllTests();
TestZKBasedOpenCloseRegion test = new TestZKBasedOpenCloseRegion();
test.setup();
test.testCloseRegion();
TestZKBasedOpenCloseRegion.afterAllTests();
}
}