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Date: Tue, 10 May 2016 18:43:12 +0000 (UTC)
From: "Tsuyoshi Ozawa (JIRA)" <jira@apache.org>
To: yarn-issues@hadoop.apache.org
Message-ID: <JIRA.12967064.1462901459000.156472.1462905792963@Atlassian.JIRA>
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References: <JIRA.12967064.1462901459000@Atlassian.JIRA> <JIRA.12967064.1462901459402@arcas>
Subject: [jira] [Commented] (YARN-5071) address HBase compatibility issues
 with trunk
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archived-at: Tue, 10 May 2016 18:43:14 -0000


    [ https://issues.apache.org/jira/browse/YARN-5071?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15278663#comment-15278663 ] 

Tsuyoshi Ozawa commented on YARN-5071:
--------------------------------------

{quote}
 In principle, I don't think this is really a HBase problem at the moment as 3.0.0 has not been released yet.
{quote}

I agree with you. I meant that we should focus on how Hadoop ecosystem, including HBase, can migrate branch-2 based code to trunk easily and smoothly. I think we should get feedback from users of Hadoop, including HBase developers, to avoid critical problems. In other words, this is a good time to recheck Hadoop Compatibility guide. http://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-common/Compatibility.html

> address HBase compatibility issues with trunk
> ---------------------------------------------
>
>                 Key: YARN-5071
>                 URL: https://issues.apache.org/jira/browse/YARN-5071
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>    Affects Versions: YARN-2928
>            Reporter: Sangjin Lee
>            Assignee: Sangjin Lee
>            Priority: Critical
>
> The trunk is now adding or planning to add more and more backward-incompatible changes. Some examples include
> - remove v.1 metrics classes (HADOOP-12504)
> - update jersey version (HADOOP-9613)
> - target java 8 by default (HADOOP-11858)
> This poses big challenges for the timeline service v.2 as we have a dependency on hbase which depends on an older version of hadoop.
> We need to find a way to solve/contain/manage these risks before it is too late.


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