[jira] [Commented] (YARN-5667) Move HBase backend code in ATS v2 into its separate module

["Haibo Chen (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/YARN-5667?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15521921#comment-15521921 ] 

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

[~sjlee0] Any reason that I am unaware of, but makes it necessary to have HBase code stay within hadoop-yarn-server-timelineservice module?

> 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
>
> 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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