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From "Sangjin Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-5071) address HBase compatibility issues with trunk
Date Tue, 10 May 2016 19:59:12 GMT

    [ https://issues.apache.org/jira/browse/YARN-5071?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15278763#comment-15278763
] 

Sangjin Lee commented on YARN-5071:
-----------------------------------

The main issue we saw was that in the trunk all metrics v.1 classes have been removed as part
of HADOOP-12504. Specifically it removed {{org.apache.hadoop.metrics.MetricsServlet}}. HBase's
HttpServer depends on this servlet (https://github.com/apache/hbase/blob/master/hbase-server/src/main/java/org/apache/hadoop/hbase/http/HttpServer.java#L679).

> 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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