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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12016) Reduce number of versions in Meta table. Make it configurable
Date Tue, 07 Oct 2014 19:16:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12016?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14162341#comment-14162341
] 

Andrew Purtell commented on HBASE-12016:
----------------------------------------

bq.  I think we need to remove checks for isTableModifiable here. Only validate that table
exists.

Sure, the table doesn't need to be modifiable, the call to checkTableModifiable was a convenient
shortcut to existence testing (if IIRC).

> Reduce number of versions in Meta table. Make it configurable
> -------------------------------------------------------------
>
>                 Key: HBASE-12016
>                 URL: https://issues.apache.org/jira/browse/HBASE-12016
>             Project: HBase
>          Issue Type: Improvement
>    Affects Versions: 2.0.0
>            Reporter: Andrey Stepachev
>            Assignee: Andrey Stepachev
>            Priority: Minor
>             Fix For: 2.0.0, 0.98.8, 0.99.1
>
>         Attachments: HBASE-12016.patch, HBASE-12016.patch, HBASE-12016.patch, HBASE-12016.patch,
HBASE-12016.patch, HBASE-12016.patch, HBASE-12016.patch
>
>
> Currently meta keeps up to 10 versions of each KV. 
> For big metas it leads to substantial memory overhead and scan slowdowns.
> (see https://issues.apache.org/jira/browse/HBASE-11165 )
> Need to keep reasonable number of versions (suggested value is 3). 
> Number of versions configurable via parameter: hbase.meta.versions



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