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From "zhengchenyu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-6396) Call verifyAndCreateRemoteLogDir at service initialization instead of application initialization to decrease load for name node
Date Mon, 03 Jul 2017 02:56:01 GMT

    [ https://issues.apache.org/jira/browse/YARN-6396?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16071869#comment-16071869
] 

zhengchenyu commented on YARN-6396:
-----------------------------------

The invocation 'createAppDir' in initAppAggregator will also visit the defaultNs! In our experience,
it decreases the speed of application. 


> Call verifyAndCreateRemoteLogDir at service initialization instead of application initialization
to decrease load for name node
> -------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: YARN-6396
>                 URL: https://issues.apache.org/jira/browse/YARN-6396
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: log-aggregation
>    Affects Versions: 3.0.0-alpha2
>            Reporter: zhihai xu
>            Assignee: zhihai xu
>            Priority: Minor
>         Attachments: YARN-6396.000.patch
>
>
> Call verifyAndCreateRemoteLogDir at service initialization instead of application initialization
to decrease load for name node.
> Currently for every application at each Node, verifyAndCreateRemoteLogDir will be called
before doing log aggregation, This will be a non trivial overhead for name node in a large
cluster since verifyAndCreateRemoteLogDir calls getFileStatus. Once the remote log directory
is created successfully, it is not necessary to call it again. It will be better to call verifyAndCreateRemoteLogDir
at LogAggregationService service initialization.



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