[jira] [Commented] (HBASE-12016) Reduce number of versions in Meta table. Make it configurable

["Andrey Stepachev (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-12016?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14138805#comment-14138805 ] 

Andrey Stepachev commented on HBASE-12016:
------------------------------------------

This patch is a bit more, it remove static defined META_TABLEDESC and make sure, that all code query for descriptor or lookup it through FSTableDescriptors. So now it is one place to get them and not static dependency in client code (meta descriptor will be queried as usual via master RPC call)

> 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: 1.0.0, 2.0.0
>            Reporter: Andrey Stepachev
>            Assignee: Andrey Stepachev
>            Priority: Minor
>         Attachments: 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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