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MAPREDUCE-3877 Add a test to formalise the current state transitions of the yarn lifecycle 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.23@1245914 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Steve Loughran 2012-02-18 13:04:12 +00:00
parent 017f6de1f7
commit b77e8aff45
3 changed files with 366 additions and 0 deletions
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123
hadoop-mapreduce-project/hadoop-yarn/hadoop-yarn-common/src/test/java/org/apache/hadoop/yarn/service/BreakableService.java Normal file
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/**
* 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.yarn.service;
import org.apache.hadoop.conf.Configuration;
/**
* This is a service that can be configured to break on any of the lifecycle
* events, so test the failure handling of other parts of the service
* infrastructure.
*
* It retains a counter to the number of times each entry point is called -
* these counters are incremented before the exceptions are raised and
* before the superclass state methods are invoked.
*
*/
public class BreakableService extends AbstractService {
private boolean failOnInit;
private boolean failOnStart;
private boolean failOnStop;
private int[] counts = new int[4];
public BreakableService() {
this(false, false, false);
}
public BreakableService(boolean failOnInit,
boolean failOnStart,
boolean failOnStop) {
super("BreakableService");
this.failOnInit = failOnInit;
this.failOnStart = failOnStart;
this.failOnStop = failOnStop;
inc(STATE.NOTINITED);
}
private int convert(STATE state) {
switch (state) {
case NOTINITED: return 0;
case INITED: return 1;
case STARTED: return 2;
case STOPPED: return 3;
default: return 0;
}
}
private void inc(STATE state) {
int index = convert(state);
counts[index] ++;
}
public int getCount(STATE state) {
return counts[convert(state)];
}
private void maybeFail(boolean fail, String action) {
if (fail) {
throw new BrokenLifecycleEvent(action);
}
}
@Override
public void init(Configuration conf) {
inc(STATE.INITED);
maybeFail(failOnInit, "init");
super.init(conf);
}
@Override
public void start() {
inc(STATE.STARTED);
maybeFail(failOnStart, "start");
super.start();
}
@Override
public void stop() {
inc(STATE.STOPPED);
maybeFail(failOnStop, "stop");
super.stop();
}
public void setFailOnInit(boolean failOnInit) {
this.failOnInit = failOnInit;
}
public void setFailOnStart(boolean failOnStart) {
this.failOnStart = failOnStart;
}
public void setFailOnStop(boolean failOnStop) {
this.failOnStop = failOnStop;
}
/**
* The exception explicitly raised on a failure
*/
public static class BrokenLifecycleEvent extends RuntimeException {
BrokenLifecycleEvent(String action) {
super("Lifecycle Failure during " + action);
}
}
}

49
hadoop-mapreduce-project/hadoop-yarn/hadoop-yarn-common/src/test/java/org/apache/hadoop/yarn/service/ServiceAssert.java Normal file
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/**
* 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.yarn.service;
import org.junit.Assert;
/**
* A set of assertions about the state of any service
*/
public class ServiceAssert extends Assert {
public static void assertServiceStateCreated(Service service) {
assertServiceInState(service, Service.STATE.NOTINITED);
}
public static void assertServiceStateInited(Service service) {
assertServiceInState(service, Service.STATE.INITED);
}
public static void assertServiceStateStarted(Service service) {
assertServiceInState(service, Service.STATE.STARTED);
}
public static void assertServiceStateStopped(Service service) {
assertServiceInState(service, Service.STATE.STOPPED);
}
public static void assertServiceInState(Service service, Service.STATE state) {
assertNotNull("Null service", service);
assertEquals("Service in wrong state: " + service, state,
service.getServiceState());
}
}

194
hadoop-mapreduce-project/hadoop-yarn/hadoop-yarn-common/src/test/java/org/apache/hadoop/yarn/service/TestServiceLifecycle.java Normal file
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/**
* 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.yarn.service;
import org.apache.hadoop.conf.Configuration;
import org.junit.Test;
public class TestServiceLifecycle extends ServiceAssert {
void assertStateCount(BreakableService service,
Service.STATE state,
int expected) {
int actual = service.getCount(state);
if (expected != actual) {
fail("Expected entry count for state [" + state +"] of " + service
+ " to be " + expected + " but was " + actual);
}
}
@Test
public void testWalkthrough() throws Throwable {
BreakableService svc = new BreakableService();
assertServiceStateCreated(svc);
assertStateCount(svc, Service.STATE.NOTINITED, 1);
assertStateCount(svc, Service.STATE.INITED, 0);
assertStateCount(svc, Service.STATE.STARTED, 0);
assertStateCount(svc, Service.STATE.STOPPED, 0);
svc.init(new Configuration());
assertServiceStateInited(svc);
assertStateCount(svc, Service.STATE.INITED, 1);
svc.start();
assertServiceStateStarted(svc);
assertStateCount(svc, Service.STATE.STARTED, 1);
svc.stop();
assertServiceStateStopped(svc);
assertStateCount(svc, Service.STATE.STOPPED, 1);
}
/**
* call init twice
* @throws Throwable
*/
@Test
public void testInitTwice() throws Throwable {
BreakableService svc = new BreakableService();
svc.init(new Configuration());
try {
svc.init(new Configuration());
fail("Expected a failure, got " + svc);
} catch (IllegalStateException e) {
//expected
}
assertStateCount(svc, Service.STATE.INITED, 2);
}
/**
* call start twice
* @throws Throwable
*/
@Test
public void testStartTwice() throws Throwable {
BreakableService svc = new BreakableService();
svc.init(new Configuration());
svc.start();
try {
svc.start();
fail("Expected a failure, got " + svc);
} catch (IllegalStateException e) {
//expected
}
assertStateCount(svc, Service.STATE.STARTED, 2);
}
/**
* verify that when a service is stopped more than once, no exception
* is thrown, and the counter is incremented
* this is because the state change operations happen after the counter in
* the subclass is incremented, even though stop is meant to be a no-op
* @throws Throwable
*/
@Test
public void testStopTwice() throws Throwable {
BreakableService svc = new BreakableService();
svc.init(new Configuration());
svc.start();
svc.stop();
assertStateCount(svc, Service.STATE.STOPPED, 1);
svc.stop();
assertStateCount(svc, Service.STATE.STOPPED, 2);
}
/**
* Show that if the service failed during an init
* operation, it stays in the created state, even after stopping it
* @throws Throwable
*/
@Test
public void testStopFailedInit() throws Throwable {
BreakableService svc = new BreakableService(true, false, false);
assertServiceStateCreated(svc);
try {
svc.init(new Configuration());
fail("Expected a failure, got " + svc);
} catch (BreakableService.BrokenLifecycleEvent e) {
//expected
}
//the service state wasn't passed
assertServiceStateCreated(svc);
assertStateCount(svc, Service.STATE.INITED, 1);
//now try to stop
svc.stop();
//even after the stop operation, we haven't entered the state
assertServiceStateCreated(svc);
}
/**
* Show that if the service failed during an init
* operation, it stays in the created state, even after stopping it
* @throws Throwable
*/
@Test
public void testStopFailedStart() throws Throwable {
BreakableService svc = new BreakableService(false, true, false);
svc.init(new Configuration());
assertServiceStateInited(svc);
try {
svc.start();
fail("Expected a failure, got " + svc);
} catch (BreakableService.BrokenLifecycleEvent e) {
//expected
}
//the service state wasn't passed
assertServiceStateInited(svc);
assertStateCount(svc, Service.STATE.INITED, 1);
//now try to stop
svc.stop();
//even after the stop operation, we haven't entered the state
assertServiceStateInited(svc);
}
/**
* verify that when a service is stopped more than once, no exception
* is thrown, and the counter is incremented
* this is because the state change operations happen after the counter in
* the subclass is incremented, even though stop is meant to be a no-op
* @throws Throwable
*/
@Test
public void testFailingStop() throws Throwable {
BreakableService svc = new BreakableService(false, false, true);
svc.init(new Configuration());
svc.start();
try {
svc.stop();
fail("Expected a failure, got " + svc);
} catch (BreakableService.BrokenLifecycleEvent e) {
//expected
}
assertStateCount(svc, Service.STATE.STOPPED, 1);
//now try again, and expect it to happen again
try {
svc.stop();
fail("Expected a failure, got " + svc);
} catch (BreakableService.BrokenLifecycleEvent e) {
//expected
}
assertStateCount(svc, Service.STATE.STOPPED, 2);
}
}