/**
*
* 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 static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import java.util.List;
import java.util.concurrent.atomic.AtomicLong;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hbase.HBaseTestingUtility;
import org.apache.hadoop.hbase.MediumTests;
import org.apache.hadoop.hbase.ServerName;
import org.apache.hadoop.hbase.SplitLogCounters;
import org.apache.hadoop.hbase.SplitLogTask;
import org.apache.hadoop.hbase.util.CancelableProgressable;
import org.apache.hadoop.hbase.zookeeper.ZKSplitLog;
import org.apache.hadoop.hbase.zookeeper.ZKUtil;
import org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.ZooDefs.Ids;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.junit.experimental.categories.Category;
@Category(MediumTests.class)
public class TestSplitLogWorker {
private static final Log LOG = LogFactory.getLog(TestSplitLogWorker.class);
private final ServerName MANAGER = new ServerName("manager,1,1");
static {
Logger.getLogger("org.apache.hadoop.hbase").setLevel(Level.DEBUG);
}
private final static HBaseTestingUtility TEST_UTIL =
new HBaseTestingUtility();
private ZooKeeperWatcher zkw;
private SplitLogWorker slw;
private void waitForCounter(AtomicLong ctr, long oldval, long newval,
long timems) {
assertTrue("ctr=" + ctr.get() + ", oldval=" + oldval + ", newval=" + newval,
waitForCounterBoolean(ctr, oldval, newval, timems));
}
private boolean waitForCounterBoolean(AtomicLong ctr, long oldval, long newval,
long timems) {
long curt = System.currentTimeMillis();
long endt = curt + timems;
while (curt < endt) {
if (ctr.get() == oldval) {
try {
Thread.sleep(10);
} catch (InterruptedException e) {
}
curt = System.currentTimeMillis();
} else {
assertEquals(newval, ctr.get());
return true;
}
}
return false;
}
@Before
public void setup() throws Exception {
TEST_UTIL.startMiniZKCluster();
zkw = new ZooKeeperWatcher(TEST_UTIL.getConfiguration(),
"split-log-worker-tests", null);
ZKUtil.deleteChildrenRecursively(zkw, zkw.baseZNode);
ZKUtil.createAndFailSilent(zkw, zkw.baseZNode);
assertTrue(ZKUtil.checkExists(zkw, zkw.baseZNode) != -1);
LOG.debug(zkw.baseZNode + " created");
ZKUtil.createAndFailSilent(zkw, zkw.splitLogZNode);
assertTrue(ZKUtil.checkExists(zkw, zkw.splitLogZNode) != -1);
LOG.debug(zkw.splitLogZNode + " created");
SplitLogCounters.resetCounters();
}
@After
public void teardown() throws Exception {
TEST_UTIL.shutdownMiniZKCluster();
}
SplitLogWorker.TaskExecutor neverEndingTask =
new SplitLogWorker.TaskExecutor() {
@Override
public Status exec(String name, CancelableProgressable p) {
while (true) {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
return Status.PREEMPTED;
}
if (!p.progress()) {
return Status.PREEMPTED;
}
}
}
};
@Test
public void testAcquireTaskAtStartup() throws Exception {
LOG.info("testAcquireTaskAtStartup");
SplitLogCounters.resetCounters();
final String TATAS = "tatas";
final ServerName RS = new ServerName("rs,1,1");
zkw.getRecoverableZooKeeper().create(ZKSplitLog.getEncodedNodeName(zkw, TATAS),
new SplitLogTask.Unassigned(new ServerName("mgr,1,1")).toByteArray(), Ids.OPEN_ACL_UNSAFE,
CreateMode.PERSISTENT);
SplitLogWorker slw = new SplitLogWorker(zkw, TEST_UTIL.getConfiguration(), RS, neverEndingTask);
slw.start();
try {
waitForCounter(SplitLogCounters.tot_wkr_task_acquired, 0, 1, 1000);
byte [] bytes = ZKUtil.getData(zkw, ZKSplitLog.getEncodedNodeName(zkw, TATAS));
SplitLogTask slt = SplitLogTask.parseFrom(bytes);
assertTrue(slt.isOwned(RS));
} finally {
stopSplitLogWorker(slw);
}
}
private void stopSplitLogWorker(final SplitLogWorker slw)
throws InterruptedException {
if (slw != null) {
slw.stop();
slw.worker.join(3000);
if (slw.worker.isAlive()) {
assertTrue(("Could not stop the worker thread slw=" + slw) == null);
}
}
}
@Test
public void testRaceForTask() throws Exception {
LOG.info("testRaceForTask");
SplitLogCounters.resetCounters();
final String TRFT = "trft";
final ServerName SVR1 = new ServerName("svr1,1,1");
final ServerName SVR2 = new ServerName("svr2,1,1");
zkw.getRecoverableZooKeeper().create(ZKSplitLog.getEncodedNodeName(zkw, TRFT),
new SplitLogTask.Unassigned(MANAGER).toByteArray(), Ids.OPEN_ACL_UNSAFE,
CreateMode.PERSISTENT);
SplitLogWorker slw1 = new SplitLogWorker(zkw, TEST_UTIL.getConfiguration(), SVR1, neverEndingTask);
SplitLogWorker slw2 = new SplitLogWorker(zkw, TEST_UTIL.getConfiguration(), SVR2, neverEndingTask);
slw1.start();
slw2.start();
try {
waitForCounter(SplitLogCounters.tot_wkr_task_acquired, 0, 1, 1000);
// Assert that either the tot_wkr_failed_to_grab_task_owned count was set of if
// not it, that we fell through to the next counter in line and it was set.
assertTrue(waitForCounterBoolean(SplitLogCounters.tot_wkr_failed_to_grab_task_owned, 0, 1, 1000) ||
SplitLogCounters.tot_wkr_failed_to_grab_task_lost_race.get() == 1);
byte [] bytes = ZKUtil.getData(zkw, ZKSplitLog.getEncodedNodeName(zkw, TRFT));
SplitLogTask slt = SplitLogTask.parseFrom(bytes);
assertTrue(slt.isOwned(SVR1) || slt.isOwned(SVR2));
} finally {
stopSplitLogWorker(slw1);
stopSplitLogWorker(slw2);
}
}
@Test
public void testPreemptTask() throws Exception {
LOG.info("testPreemptTask");
SplitLogCounters.resetCounters();
final ServerName SRV = new ServerName("tpt_svr,1,1");
final String PATH = ZKSplitLog.getEncodedNodeName(zkw, "tpt_task");
SplitLogWorker slw = new SplitLogWorker(zkw, TEST_UTIL.getConfiguration(), SRV, neverEndingTask);
slw.start();
try {
Thread.yield(); // let the worker start
Thread.sleep(100);
// this time create a task node after starting the splitLogWorker
zkw.getRecoverableZooKeeper().create(PATH,
new SplitLogTask.Unassigned(MANAGER).toByteArray(), Ids.OPEN_ACL_UNSAFE,
CreateMode.PERSISTENT);
waitForCounter(SplitLogCounters.tot_wkr_task_acquired, 0, 1, 1000);
assertEquals(1, slw.taskReadySeq);
byte [] bytes = ZKUtil.getData(zkw, PATH);
SplitLogTask slt = SplitLogTask.parseFrom(bytes);
assertTrue(slt.isOwned(SRV));
slt = new SplitLogTask.Unassigned(MANAGER);
ZKUtil.setData(zkw, PATH, slt.toByteArray());
waitForCounter(SplitLogCounters.tot_wkr_preempt_task, 0, 1, 1000);
} finally {
stopSplitLogWorker(slw);
}
}
@Test
public void testMultipleTasks() throws Exception {
LOG.info("testMultipleTasks");
SplitLogCounters.resetCounters();
final ServerName SRV = new ServerName("tmt_svr,1,1");
final String PATH1 = ZKSplitLog.getEncodedNodeName(zkw, "tmt_task");
SplitLogWorker slw = new SplitLogWorker(zkw, TEST_UTIL.getConfiguration(), SRV, neverEndingTask);
slw.start();
try {
Thread.yield(); // let the worker start
Thread.sleep(100);
SplitLogTask unassignedManager = new SplitLogTask.Unassigned(MANAGER);
zkw.getRecoverableZooKeeper().create(PATH1, unassignedManager.toByteArray(),
Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
waitForCounter(SplitLogCounters.tot_wkr_task_acquired, 0, 1, 1000);
// now the worker is busy doing the above task
// create another task
final String PATH2 = ZKSplitLog.getEncodedNodeName(zkw, "tmt_task_2");
zkw.getRecoverableZooKeeper().create(PATH2, unassignedManager.toByteArray(),
Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
// preempt the first task, have it owned by another worker
final ServerName anotherWorker = new ServerName("another-worker,1,1");
SplitLogTask slt = new SplitLogTask.Owned(anotherWorker);
ZKUtil.setData(zkw, PATH1, slt.toByteArray());
waitForCounter(SplitLogCounters.tot_wkr_preempt_task, 0, 1, 1000);
waitForCounter(SplitLogCounters.tot_wkr_task_acquired, 1, 2, 1000);
assertEquals(2, slw.taskReadySeq);
byte [] bytes = ZKUtil.getData(zkw, PATH2);
slt = SplitLogTask.parseFrom(bytes);
assertTrue(slt.isOwned(SRV));
} finally {
stopSplitLogWorker(slw);
}
}
@Test
public void testRescan() throws Exception {
LOG.info("testRescan");
SplitLogCounters.resetCounters();
final ServerName SRV = new ServerName("svr,1,1");
slw = new SplitLogWorker(zkw, TEST_UTIL.getConfiguration(), SRV, neverEndingTask);
slw.start();
Thread.yield(); // let the worker start
Thread.sleep(100);
String task = ZKSplitLog.getEncodedNodeName(zkw, "task");
SplitLogTask slt = new SplitLogTask.Unassigned(MANAGER);
zkw.getRecoverableZooKeeper().create(task,slt.toByteArray(), Ids.OPEN_ACL_UNSAFE,
CreateMode.PERSISTENT);
waitForCounter(SplitLogCounters.tot_wkr_task_acquired, 0, 1, 1000);
// now the worker is busy doing the above task
// preempt the task, have it owned by another worker
ZKUtil.setData(zkw, task, slt.toByteArray());
waitForCounter(SplitLogCounters.tot_wkr_preempt_task, 0, 1, 1000);
// create a RESCAN node
String rescan = ZKSplitLog.getEncodedNodeName(zkw, "RESCAN");
rescan = zkw.getRecoverableZooKeeper().create(rescan, slt.toByteArray(), Ids.OPEN_ACL_UNSAFE,
CreateMode.PERSISTENT_SEQUENTIAL);
waitForCounter(SplitLogCounters.tot_wkr_task_acquired, 1, 2, 1000);
// RESCAN node might not have been processed if the worker became busy
// with the above task. preempt the task again so that now the RESCAN
// node is processed
ZKUtil.setData(zkw, task, slt.toByteArray());
waitForCounter(SplitLogCounters.tot_wkr_preempt_task, 1, 2, 1000);
waitForCounter(SplitLogCounters.tot_wkr_task_acquired_rescan, 0, 1, 1000);
List<String> nodes = ZKUtil.listChildrenNoWatch(zkw, zkw.splitLogZNode);
LOG.debug(nodes);
int num = 0;
for (String node : nodes) {
num++;
if (node.startsWith("RESCAN")) {
String name = ZKSplitLog.getEncodedNodeName(zkw, node);
String fn = ZKSplitLog.getFileName(name);
byte [] data = ZKUtil.getData(zkw, ZKUtil.joinZNode(zkw.splitLogZNode, fn));
slt = SplitLogTask.parseFrom(data);
assertTrue(slt.toString(), slt.isDone(SRV));
}
}
assertEquals(2, num);
}
}