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From "Sangjin Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-6094) Update the coprocessor to be a dynamically loaded one
Date Thu, 19 Jan 2017 21:56:26 GMT

    [ https://issues.apache.org/jira/browse/YARN-6094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15830680#comment-15830680
] 

Sangjin Lee commented on YARN-6094:
-----------------------------------

I went over the latest patch, and noticed one thing (sorry should have seen them earlier).

In {{TestHBaseTimelineStorageSchema}} I see the following line has been added:
{code}
    conf.setInt("hfile.format.version", 3);
{code}
What does this signify? Why is this change needed?


> Update the coprocessor to be a dynamically loaded one
> -----------------------------------------------------
>
>                 Key: YARN-6094
>                 URL: https://issues.apache.org/jira/browse/YARN-6094
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>            Reporter: Vrushali C
>            Assignee: Vrushali C
>              Labels: yarn-5355-merge-blocker
>         Attachments: YARN-6094.001.patch, YARN-6094-YARN-5355.001.patch, YARN-6094-YARN-5355.002.patch,
YARN-6094-YARN-5355.003.patch, YARN-6094-YARN-5355.004.patch
>
>
> The timeline service v2 code base on yarn now uses hbase 1.2.4 after YARN-5976. 
> With this version of hbase, system classes (starting with org.apache.hadoop) can be loaded
as table level coprocessors. Hence we should update the timeline service coprocessor to be
a dynamically loaded one instead of static loading. 
> This involves code changes as well as documentation updates for deployment.



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