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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12016) Reduce number of versions in Meta table. Make it configurable
Date Fri, 19 Sep 2014 00:48:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12016?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14139799#comment-14139799
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stack commented on HBASE-12016:
-------------------------------

Undoing the hardcoding of meta is the right way to go. I see this patch as fine for now but
imagine we could be in for some interesting times when meta actually changes an attribute....
Lets see how it goes..

Patch looks good to me except for the nit that meta is defined in FSTableDescriptor rather
than say in TableDescriptor. If we have another registry implementation, it would have to
copy the FSTD definition for meta?

> 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, 0.98.7, 0.99.1
>
>         Attachments: 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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