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https://issues.apache.org/jira/browse/PHOENIX-4408?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16283147#comment-16283147
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Karan Mehta commented on PHOENIX-4408:
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PHOENIX-3752 removed the PhoenixMetricsSink. I think further cleanup is
required to remove all the classes and complete dependency on MetricsSink.
> Figure out Hadoop version compatibility
> ---------------------------------------
>
> Key: PHOENIX-4408
> URL: https://issues.apache.org/jira/browse/PHOENIX-4408
> Project: Phoenix
> Issue Type: Sub-task
> Reporter: Josh Elser
> Priority: Blocker
> Fix For: 5.0.0
>
>
> The 5.x-HBase-2.0 branch is presently incompatible with both Hadoop 2.7 and
> Hadoop 3.0.
> This stems from PhoenixMetricsSink and LoggingSink both of which extend
> MetricsSink from Hadoop. Hadoop leaks a commons-configuration class into a
> method signature and changes the dependency across versions.
> This makes it extremely annoying to work around downstream (we would have to
> create multiple maven modules to shim around this). We should figure out what
> compatibility we want to have. Post PHOENIX-4405, it's only Hadoop3.
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