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https://issues.apache.org/jira/browse/YARN-7133?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16553202#comment-16553202
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Daniel Templeton commented on YARN-7133:
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For one, it's the format set as the standard by Sun. See
https://docs.oracle.com/javase/6/docs/api/java/util/concurrent/locks/ReentrantReadWriteLock.html
> Clean up lock-try order in fair scheduler
> -----------------------------------------
>
> Key: YARN-7133
> URL: https://issues.apache.org/jira/browse/YARN-7133
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: fairscheduler
> Affects Versions: 3.0.0-alpha4
> Reporter: Daniel Templeton
> Assignee: Szilard Nemeth
> Priority: Major
> Labels: newbie
> Attachments: YARN-7133.001.patch
>
>
> There are many places that follow the pattern:{code}try {
> lock.lock();
> ...
> } finally {
> lock.unlock();
> }{code}
> There are a couple of reasons that's a bad idea. The correct pattern
> is:{code}lock.lock();
> try {
> ...
> } finally {
> lock.unlock();
> }{code}
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