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https://issues.apache.org/jira/browse/YARN-164?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Devaraj K updated YARN-164:
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Attachment: YARN-164.patch
Attaching the straightforward patch to fix this issue.
> Race condition in Fair Scheduler
> --------------------------------
>
> Key: YARN-164
> URL: https://issues.apache.org/jira/browse/YARN-164
> Project: Hadoop YARN
> Issue Type: Bug
> Components: scheduler
> Affects Versions: 2.0.2-alpha
> Reporter: Devaraj K
> Assignee: Devaraj K
> Priority: Critical
> Attachments: YARN-164.patch
>
>
> {code:xml}
> Thread updateThread = new Thread(new UpdateThread());
> updateThread.start();
> initialized = true;
> {code}
> In the above code, making the initialized as true after starting the
> UpdateThread.
> {code:xml}
> private class UpdateThread implements Runnable {
> public void run() {
> while (initialized) {
> try {
> Thread.sleep(UPDATE_INTERVAL);
> update();
> preemptTasksIfNecessary();
> } catch (Exception e) {
> LOG.error("Exception in fair scheduler UpdateThread", e);
> }
> }
> }
> }
> {code}
> In this run method of UpdateThread, it is checking for the initialized and
> exiting if it is not true. Here most of the times initialized is getting true
> after exiting the UpdateThread and the thread functionality is missing, due
> to that all the submitted applications are hanging without making any
> progress.
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