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Posted to issues@hbase.apache.org by "Hudson (JIRA)" <ji...@apache.org> on 2011/07/13 23:13:59 UTC

[jira] [Commented] (HBASE-451) Remove HTableDescriptor from HRegionInfo

    [ https://issues.apache.org/jira/browse/HBASE-451?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13064854#comment-13064854 ] 

Hudson commented on HBASE-451:
------------------------------

Integrated in HBase-TRUNK #2026 (See [https://builds.apache.org/job/HBase-TRUNK/2026/])
    Fix broken TestScanMultipleVersions test -- needed .tableinfo defined before test started... part of the repercussions from hbase-451


> 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-addendum-v2.txt, 451_support_for_removing_HTD_from_HRI_trunk.txt, HBASE-451-Fixed_broken_TestAdmin.patch, HBASE-451-Fixed_broken_TestAdmin1.patch, 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, descriptors.txt, fixtestadmin.txt, pass_htd_on_region_construction.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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