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Posted to issues@hbase.apache.org by "Josh Elser (Jira)" <ji...@apache.org> on 2020/03/06 17:32:00 UTC

[jira] [Commented] (HBASE-23562) [operator tools] Add a RegionsMerge tool that allows for merging multiple adjacent regions until a desired number of regions is reached.

    [ https://issues.apache.org/jira/browse/HBASE-23562?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17053618#comment-17053618 ] 

Josh Elser commented on HBASE-23562:
------------------------------------

bq. should we consider adding this functionality natively

We actually already have this functionality natively in the Region Normalizer chore.

I'd like to see some differentiation to prevent this feature and the Region Normalizer from overlapping and causing confusion in "how do I reduce the regions in my cluster"?

Thinking about it quickly, I think if we focus the Normalizer on "slow, always-on, always correcting, low-user impact" and this tool on "Proactively merging many regions together, high-user impact, 'fast'", that's a decent distinction.

> [operator tools] Add a RegionsMerge tool that allows for merging multiple adjacent regions until a desired number of regions is reached.
> ----------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-23562
>                 URL: https://issues.apache.org/jira/browse/HBASE-23562
>             Project: HBase
>          Issue Type: New Feature
>            Reporter: Wellington Chevreuil
>            Assignee: Wellington Chevreuil
>            Priority: Minor
>
> There's been a few occasions where different customers had faced the need to reduce the number of regions for specific tables, either due to mistakenly pre-split or after a purge in table data. This jira is for adding a simple merge tool that takes the table name and the desired number of regions, then perform region merges until the total number of regions for the given table reached the passed valued. 



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