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Date: Tue, 14 Jun 2011 21:10:54 +0000 (UTC)
From: "stack (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
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Subject: [jira] [Updated] (HBASE-451) Remove HTableDescriptor from
 HRegionInfo
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     [ https://issues.apache.org/jira/browse/HBASE-451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

stack updated HBASE-451:
------------------------

    Attachment: fixtestadmin.txt

Subbu.  TestAdmin is only test failing because of this commit.  Reason its failing is because of our test of many concurrent table creates.  I think the writing of the tableinfo file makes this all a little more complicated.  I did a bit of cleanup in the attached patch. One byproduct is that now HRegion knows nothing of HTableDesc (we no longer try and create the tableinfo everytime we create a region -- that seems a little wonky reaching up to the directory above....)   What you think?

> 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_-_Fourth_draft_support_for_removing_HTD_from_HRI.patch, HBASE-451_-_Second_draft_-_Remove_HTD_from_HRI.patch, fixtestadmin.txt
>
>
> 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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