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From "Vinod Kumar Vavilapalli (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2583) Modify the LogDeletionService to support Log aggregation for LRS
Date Tue, 07 Oct 2014 17:15:37 GMT

    [ https://issues.apache.org/jira/browse/YARN-2583?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14162143#comment-14162143

Vinod Kumar Vavilapalli commented on YARN-2583:

[~xgong], can you please post a short summary of the final proposal here?

> Modify the LogDeletionService to support Log aggregation for LRS
> ----------------------------------------------------------------
>                 Key: YARN-2583
>                 URL: https://issues.apache.org/jira/browse/YARN-2583
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: nodemanager, resourcemanager
>            Reporter: Xuan Gong
>            Assignee: Xuan Gong
>         Attachments: YARN-2583.1.patch, YARN-2583.2.patch, YARN-2583.3.1.patch, YARN-2583.3.patch
> Currently, AggregatedLogDeletionService will delete old logs from HDFS. It will check
the cut-off-time, if all logs for this application is older than this cut-off-time. The app-log-dir
from HDFS will be deleted. This will not work for LRS. We expect a LRS application can keep
running for a long time. 
> Two different scenarios: 
> 1) If we configured the rollingIntervalSeconds, the new log file will be always uploaded
to HDFS. The number of log files for this application will become larger and larger. And there
is no log files will be deleted.
> 2) If we did not configure the rollingIntervalSeconds, the log file can only be uploaded
to HDFS after the application is finished. It is very possible that the logs are uploaded
after the cut-off-time. It will cause problem because at that time the app-log-dir for this
application in HDFS has been deleted.

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