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From "Haibo Chen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-5667) Move HBase backend code in ATS v2 into its separate module
Date Thu, 13 Oct 2016 06:41:20 GMT

    [ https://issues.apache.org/jira/browse/YARN-5667?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15571044#comment-15571044
] 

Haibo Chen commented on YARN-5667:
----------------------------------

Please leave out part 8 of the patch when you review. I will go over the dependency again
to do the cleanup. Thinking of going over the dependency listed in maven dependency:analyze,
and checking if the dependency is indeed used in source code (not rely on mvn, or compilation).
Any suggestion? 

> Move HBase backend code in ATS v2  into its separate module
> -----------------------------------------------------------
>
>                 Key: YARN-5667
>                 URL: https://issues.apache.org/jira/browse/YARN-5667
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: yarn
>            Reporter: Haibo Chen
>            Assignee: Haibo Chen
>         Attachments: New module structure.png, part1.yarn5667.prelim.patch, part2.yarn5667.prelim.patch,
part3.yarn5667.prelim.patch, part4.yarn5667.prelim.patch, part5.yarn5667.prelim.patch, pt1.yarn5667.001.patch,
pt2.yarn5667.001.patch, pt3.yarn5667.001.patch, pt4.yarn5667.001.patch, pt5.yarn5667.001.patch,
pt6.yarn5667.001.patch, pt9.yarn5667.001.patch, yarn5667-001.tar.gz
>
>
> The HBase backend code currently lives along with the core ATS v2 code in hadoop-yarn-server-timelineservice
module. Because Resource Manager depends on hadoop-yarn-server-timelineservice, an unnecessary
dependency of the RM module on HBase modules is introduced (HBase backend is pluggable, so
we do not need to directly pull in HBase jars). 
> In our internal effort to try ATS v2 with HBase 2.0 which depends on Hadoop 3, we encountered
a circular dependency during our builds between HBase2.0 and Hadoop3 artifacts.
> {code}
> hadoop-mapreduce-client-common, hadoop-yarn-client, hadoop-yarn-server-resourcemanager,
hadoop-yarn-server-timelineservice, hbase-server, hbase-prefix-tree, hbase-hadoop2-compat,
hadoop-mapreduce-client-jobclient, hadoop-mapreduce-client-common]
> {code}
> This jira proposes we move all HBase-backend-related code from hadoop-yarn-server-timelineservice
into its own module (possible name is yarn-server-timelineservice-storage) so that core RM
modules do not depend on HBase modules any more.



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