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From "Subbu M Iyer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-451) Remove HTableDescriptor from HRegionInfo
Date Thu, 09 Jun 2011 17:14:59 GMT

    [ https://issues.apache.org/jira/browse/HBASE-451?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13046681#comment-13046681
] 

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

I have created a new trunk snapshot last evening and applied my patch as well as resolved
the conflicts.

All tests have passed except the two below.
1. TestReplication.queueFailover - I see a very informative note on this failure in the test
as shown below, so I would
   think that this is not due to HBASE-451 changes.
	-- WARNING this test sometimes fails because of HBASE-3515
2. TestMasterFailover - Need to research more.

Both these tests passed in my older snapshot build (which is one week+ old) and I will review
it closer again.
Also, a closer look at the failure log shows that these failures may not be due to HBASE-451
changes.

Here are my priorities now:
1. Address failures from your test run.
2. Work on the issue of master crash during meta migration at startup.

> 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
>
>
> 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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