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Posted to yarn-issues@hadoop.apache.org by "Vinod Kumar Vavilapalli (JIRA)" <ji...@apache.org> on 2012/10/17 20:20:05 UTC
[jira] [Commented] (YARN-162) nodemanager log aggregation has
scaling issues with namenode
[ https://issues.apache.org/jira/browse/YARN-162?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13478098#comment-13478098 ]
Vinod Kumar Vavilapalli commented on YARN-162:
----------------------------------------------
Pity we didn't foresee this.
The NM has per-app file handles open, but it doesn't close them till the application finishes.
Arguably, this connections are to the data-nodes, but the DFSClient also keeps a transient connection to NNs which seem to be causing this.
Will investigate more and take a stab at fixing this.
> nodemanager log aggregation has scaling issues with namenode
> ------------------------------------------------------------
>
> Key: YARN-162
> URL: https://issues.apache.org/jira/browse/YARN-162
> Project: Hadoop YARN
> Issue Type: Bug
> Components: nodemanager
> Affects Versions: 0.23.3
> Reporter: Nathan Roberts
> Assignee: Vinod Kumar Vavilapalli
> Priority: Critical
>
> Log aggregation causes fd explosion on the namenode. On large clusters this can exhaust FDs to the point where datanodes can't check-in.
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