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Posted to issues@tez.apache.org by "László Bodor (Jira)" <ji...@apache.org> on 2020/04/17 13:09:00 UTC

[jira] [Assigned] (TEZ-4147) Reduce NN calls in RecoveryService::handleRecoveryEvent

     [ https://issues.apache.org/jira/browse/TEZ-4147?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

László Bodor reassigned TEZ-4147:
---------------------------------

    Assignee: László Bodor

> Reduce NN calls in RecoveryService::handleRecoveryEvent
> -------------------------------------------------------
>
>                 Key: TEZ-4147
>                 URL: https://issues.apache.org/jira/browse/TEZ-4147
>             Project: Apache Tez
>          Issue Type: Improvement
>            Reporter: Rajesh Balamohan
>            Assignee: László Bodor
>            Priority: Trivial
>
> [https://github.com/apache/tez/blob/master/tez-dag/src/main/java/org/apache/tez/dag/history/recovery/RecoveryService.java#L459]
> [https://github.com/apache/tez/blob/master/tez-dag/src/main/java/org/apache/tez/dag/history/recovery/RecoveryService.java#L467]
> {{create(overwrite=false)}} already checks for file exists and throws relevant exception. It should be possible to reduce {{recoveryDirFS.exists(dagFilePath)}} check to help in concurrent job runs (e.g 50-100 AM trying to run very short jobs).



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