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From "Subbu M Iyer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-451) Remove HTableDescriptor from HRegionInfo
Date Wed, 08 Jun 2011 04:53:59 GMT

    [ https://issues.apache.org/jira/browse/HBASE-451?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13045777#comment-13045777
] 

Subbu M Iyer commented on HBASE-451:
------------------------------------

Stack: Sure. My git pull is one week old and looks like I will have to manually merge it (as
I have more than 80+ files for this change) to latest and get a patch out of it. I am working
on it.



> Remove HTableDescriptor from HRegionInfo
> ----------------------------------------
>
>                 Key: HBASE-451
>                 URL: https://issues.apache.org/jira/browse/HBASE-451
>             Project: HBase
>          Issue Type: Improvement
>          Components: master, regionserver
>    Affects Versions: 0.2.0
>            Reporter: Jim Kellerman
>            Assignee: Subbu M Iyer
>            Priority: Critical
>             Fix For: 0.92.0
>
>         Attachments: 451_support_for_removing_HTD_from_HRI_trunk.txt, HBASE-451_-_First_draft_support_for_removing_HTD_from_HRI1.patch,
HBASE-451_-_Second_draft_-_Remove_HTD_from_HRI.patch
>
>
> There is an HRegionInfo for every region in HBase. Currently HRegionInfo also contains
the HTableDescriptor (the schema). That means we store the schema n times where n is the number
of regions in the table.
> Additionally, for every region of the same table that the region server has open, there
is a copy of the schema. Thus it is stored in memory once for each open region.
> If HRegionInfo merely contained the table name the HTableDescriptor could be stored in
a separate file and easily found.

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