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From "Josh Elser (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-17973) Create shell command to identify regions with poor locality
Date Tue, 02 May 2017 21:51:04 GMT

    [ https://issues.apache.org/jira/browse/HBASE-17973?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15993853#comment-15993853
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Josh Elser commented on HBASE-17973:
------------------------------------

bq. is any internal filter method available on Arrays since there was none explicitly defined.

No, it was just a typo; it should have been {{select}}.

> Create shell command to identify regions with poor locality
> -----------------------------------------------------------
>
>                 Key: HBASE-17973
>                 URL: https://issues.apache.org/jira/browse/HBASE-17973
>             Project: HBase
>          Issue Type: Improvement
>          Components: shell
>            Reporter: Josh Elser
>            Assignee: Josh Elser
>             Fix For: 2.0.0
>
>         Attachments: HBASE-17973.001.patch, HBASE-17973.002.patch, HBASE-17973.003.patch
>
>
> The data locality of regions often plays a large role in the efficiency of HBase. Compactions
are also expensive to execute, especially on very large tables. The balancer can do a good
job trying to maintain locality (when tuned properly), but it is not perfect.
> This creates a less-than-desirable situation where it's a costly operation to take a
cluster with spotty poor locality (e.g. a small percentage of regionservers with poor locality).
> We already have this information available via the {{ClusterStatus}} proto. We can easily
write a shell command that can present regions which are lacking a certain percentage of locality.



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