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https://issues.apache.org/jira/browse/HBASE-18882?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16384208#comment-16384208
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Josh Elser commented on HBASE-18882:
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{quote}Did you go both ways (1.2 MR'ing against 2.0 and vice-versa)?
{quote}
Nope, only went one-way 1.2.7->2.0. Wasn't sure if we cared about using new 
libs against the old cluster (I assumed not)
{quote}It looks like you also did HBASE-18758 while you were at it
{quote}
Yup, that's good.

> [TEST] Run MR branch-1 jobs against hbase2 cluster
> --------------------------------------------------
>
>                 Key: HBASE-18882
>                 URL: https://issues.apache.org/jira/browse/HBASE-18882
>             Project: HBase
>          Issue Type: Task
>          Components: mapreduce, test
>            Reporter: stack
>            Assignee: Josh Elser
>            Priority: Critical
>             Fix For: 2.0.0
>
>
> Ensure this works still. Run all our bundled MR tools at least. Find some 
> custom if time.



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