[jira] [Commented] (HBASE-4010) HMaster.createTable could be heavily optimized

["Ted Yu (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-4010?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13052263#comment-13052263 ] 

Ted Yu commented on HBASE-4010:
-------------------------------

HLog depends on regionDir (computed from HRegionInfo) and HRegionInfo itself.
The HLog instance is used by the new HRegion.

> HMaster.createTable could be heavily optimized
> ----------------------------------------------
>
>                 Key: HBASE-4010
>                 URL: https://issues.apache.org/jira/browse/HBASE-4010
>             Project: HBase
>          Issue Type: Improvement
>    Affects Versions: 0.90.3
>            Reporter: Jean-Daniel Cryans
>             Fix For: 0.92.0
>
>
> Looking at the createTable method in HMaster (the one that's private), we seem to be very inefficient:
>  - We set the enabled flag for the table for every region (should be done only once).
>  - Every time we create a new region we create a new HLog and then close it (reuse one instead or see if it's really necessary).
>  - We do one RPC to .META. per region (we should batch put).
> This should provide drastic speedups even for those creating tables with just 50 regions.

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