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https://issues.apache.org/jira/browse/HBASE-20214?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16437895#comment-16437895
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Sean Busbey commented on HBASE-20214:
-------------------------------------

don't use commons-collections v3. You should use the commons-collection v4 API 
that's been relocated in the hbase-thirdparty library.

FWIW, the description is here: [http://hbase.apache.org/book.html#thirdparty]

Basically, any class found in commons-collections4 should be present if you 
prefix the package with {{org.apache.hbase.thirdparty}}, e.g. 
{{org.apache.hbase.thirdparty.org.apache.commons.collections4.CollectionUtils}}.

> Review of RegionLocationFinder Class
> ------------------------------------
>
>                 Key: HBASE-20214
>                 URL: https://issues.apache.org/jira/browse/HBASE-20214
>             Project: HBase
>          Issue Type: Improvement
>          Components: Balancer, master
>    Affects Versions: 2.0.0
>            Reporter: BELUGA BEHR
>            Assignee: BELUGA BEHR
>            Priority: Minor
>         Attachments: HBASE-20214.1.patch, HBASE-20214.2.patch
>
>
> # Use SLF4J parameter logging
>  # Remove superfluous code
>  # Replace code with re-usable libraries where possible
>  # Use different data structure
>  # Small perf improvements
>  # Fix some checkstyle



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