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YARN-2264. Fixed a race condition in DrainDispatcher which may cause random test failures. Contributed by Li Lu 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1611126 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Jian He 2014-07-16 18:25:05 +00:00
parent 43fe48d9e2
commit 40e1bb9d31
2 changed files with 13 additions and 4 deletions
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3
hadoop-yarn-project/CHANGES.txt
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@ -59,6 +59,9 @@ Release 2.6.0 - UNRELEASED
YARN-2260. Fixed ResourceManager's RMNode to correctly remember containers
when nodes resync during work-preserving RM restart. (Jian He via vinodkv)
YARN-2264. Fixed a race condition in DrainDispatcher which may cause random
test failures. (Li Lu via jianhe)
Release 2.5.0 - UNRELEASED
INCOMPATIBLE CHANGES

14
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/test/java/org/apache/hadoop/yarn/event/DrainDispatcher.java
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@ -28,6 +28,7 @@ public class DrainDispatcher extends AsyncDispatcher {
// and similar grotesqueries
private volatile boolean drained = false;
private final BlockingQueue<Event> queue;
final Object mutex;
public DrainDispatcher() {
this(new LinkedBlockingQueue<Event>());
@ -36,6 +37,7 @@ public class DrainDispatcher extends AsyncDispatcher {
private DrainDispatcher(BlockingQueue<Event> eventQueue) {
super(eventQueue);
this.queue = eventQueue;
this.mutex = this;
}
/**
@ -53,8 +55,10 @@ public class DrainDispatcher extends AsyncDispatcher {
@Override
public void run() {
while (!Thread.currentThread().isInterrupted()) {
// !drained if dispatch queued new events on this dispatcher
drained = queue.isEmpty();
synchronized (mutex) {
// !drained if dispatch queued new events on this dispatcher
drained = queue.isEmpty();
}
Event event;
try {
event = queue.take();
@ -75,8 +79,10 @@ public class DrainDispatcher extends AsyncDispatcher {
return new EventHandler() {
@Override
public void handle(Event event) {
drained = false;
actual.handle(event);
synchronized (mutex) {
actual.handle(event);
drained = false;
}
}
};
}