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https://issues.apache.org/jira/browse/HADOOP-11499?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14287843#comment-14287843
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Ted Yu commented on HADOOP-11499:
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@Jason:
What do you think of the patch ?
> Check of executorThreadsStarted in ValueQueue#submitRefillTask() evades lock
> acquisition
> ----------------------------------------------------------------------------------------
>
> Key: HADOOP-11499
> URL: https://issues.apache.org/jira/browse/HADOOP-11499
> Project: Hadoop Common
> Issue Type: Bug
> Reporter: Ted Yu
> Assignee: Ted Yu
> Priority: Minor
> Attachments: hadoop-11499-001.patch
>
>
> {code}
> if (!executorThreadsStarted) {
> synchronized (this) {
> // To ensure all requests are first queued, make coreThreads =
> // maxThreads
> // and pre-start all the Core Threads.
> executor.prestartAllCoreThreads();
> executorThreadsStarted = true;
> }
> }
> {code}
> It is possible that two threads executing the above code both see
> executorThreadsStarted as being false, leading to
> executor.prestartAllCoreThreads() called twice.
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