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https://issues.apache.org/jira/browse/YARN-7087?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16139030#comment-16139030
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Jason Lowe commented on YARN-7087:
----------------------------------
Looks like this is related to YARN-221 and YARN-4152. The latter fixed the NPE
issue introduced by the first, but unfortunately simply ignoring container IDs
that are absent isn't a real fix. The end result when that scenario occurs is
that we will always skip aggregating that container's logs, and that may or may
not be the desired effect. In this case it was not.
I believe the scenario occurs because LogAggregationService has not seen the
event requesting log aggregation before the NM heartbeats to the RM and then
decides to remove the container because the app has completed. The aggregation
service appears to only need to lookup the container to get the container type,
so maybe we can simply store the container type in the log aggregation event so
it doesn't need to lookup the container to process the event.
> NM failed to perform log aggregation due to absent container
> ------------------------------------------------------------
>
> Key: YARN-7087
> URL: https://issues.apache.org/jira/browse/YARN-7087
> Project: Hadoop YARN
> Issue Type: Bug
> Components: log-aggregation
> Affects Versions: 2.8.1
> Reporter: Jason Lowe
> Priority: Critical
>
> Saw a case where the NM failed to aggregate the logs for a container because
> it claimed it was absent:
> {noformat}
> 2017-08-23 18:35:38,283 [AsyncDispatcher event handler] WARN
> logaggregation.LogAggregationService: Log aggregation cannot be started for
> container_e07_1503326514161_502342_01_000001, as its an absent container
> {noformat}
> Containers should not be allowed to disappear if they're not done being fully
> processed by the NM.
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