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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-451) Remove HTableDescriptor from HRegionInfo
Date Fri, 24 Jun 2011 21:39:47 GMT

     [ https://issues.apache.org/jira/browse/HBASE-451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ted Yu updated HBASE-451:
-------------------------

    Attachment: 451-addendum.txt

Here is my addendum.
There could be a cleaner way of detecting that table descriptor doesn't exist on HDFS. For
the moment, I rely on TableExistsException.

> 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.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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