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From "Jun Gong (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (YARN-4720) Skip unnecessary NN operations in log aggregation
Date Thu, 25 Feb 2016 03:07:18 GMT

     [ https://issues.apache.org/jira/browse/YARN-4720?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jun Gong updated YARN-4720:
---------------------------
    Attachment: YARN-4720.03.patch

> Skip unnecessary NN operations in log aggregation
> -------------------------------------------------
>
>                 Key: YARN-4720
>                 URL: https://issues.apache.org/jira/browse/YARN-4720
>             Project: Hadoop YARN
>          Issue Type: Improvement
>            Reporter: Ming Ma
>            Assignee: Jun Gong
>         Attachments: YARN-4720.01.patch, YARN-4720.02.patch, YARN-4720.03.patch
>
>
> Log aggregation service could have unnecessary NN operations in the following scenarios:
> * No new local log has been created since the last upload for the long running service
scenario.
> * NM uses {{ContainerLogAggregationPolicy}} that skips log aggregation for certain containers.
> In the following code snippet, even though {{pendingContainerInThisCycle}} is empty,
it still creates the writer and then removes the file later. Thus it introduces unnecessary
create/getfileinfo/delete NN calls when NM doesn't aggregate logs for an app.
>   
> {noformat}
> AppLogAggregatorImpl.java
> ......
>         writer =
>             new LogWriter(this.conf, this.remoteNodeTmpLogFileForApp,
>                 this.userUgi);
> ......
>       for (ContainerId container : pendingContainerInThisCycle) {
> ......
>       }
> ......
>             if (remoteFS.exists(remoteNodeTmpLogFileForApp)) {
>               if (rename) {
>                 remoteFS.rename(remoteNodeTmpLogFileForApp, renamedPath);
>               } else {
>                 remoteFS.delete(remoteNodeTmpLogFileForApp, false);
>               }
>             }
> ......
> {noformat}



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