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https://issues.apache.org/jira/browse/YARN-2144?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14040328#comment-14040328
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Jian He commented on YARN-2144:
-------------------------------
The first check can never happen?
{code}
if (null == attemptId) {
return;
}
{code}
Please add logs also if app/attempt equals to null.
{code}
if (null == app) {
return;
}
if (null == attempt) {
return;
}
{code}
> Add logs when preemption occurs
> -------------------------------
>
> Key: YARN-2144
> URL: https://issues.apache.org/jira/browse/YARN-2144
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: capacityscheduler
> Affects Versions: 2.5.0
> Reporter: Tassapol Athiapinya
> Assignee: Wangda Tan
> Attachments: AM-page-preemption-info.png, YARN-2144.patch,
> YARN-2144.patch, YARN-2144.patch, YARN-2144.patch, YARN-2144.patch,
> YARN-2144.patch
>
>
> There should be easy-to-read logs when preemption does occur.
> RM logs should have following properties:
> * Logs are retrievable when an application is still running and often flushed.
> * Can distinguish between AM container preemption and task container
> preemption with container ID shown.
> * Should be INFO level log.
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