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From "Ming Ma (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4524) support for more than one region in .META. table
Date Sat, 01 Oct 2011 00:43:45 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4524?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13118603#comment-13118603

Ming Ma commented on HBASE-4524:

Agree on the "remove ROOT" suggestion for the current scale. I had this question when fixing
HBASE-4455, why do we need such redirection in the current scale?

Does anyone know if 1M regions is a realistic scenario any time soon? 1M regions implies 10K
RSs if we have 100 regions per RS. That is a really large scale HBase cluster.

Also, is there a chance we will put lot more meta data for each region to .META. table, thus
we don't need 1M regions to make .META. table large? If we somehow need to put 100K bytes
for each region in .META. table, we just need 100K regions to make .META. table reach 10GB.
> support for more than one region in .META. table
> ------------------------------------------------
>                 Key: HBASE-4524
>                 URL: https://issues.apache.org/jira/browse/HBASE-4524
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Ming Ma
>            Assignee: Ming Ma
> It seems there are some assumptions in the code that .META. table only has one region
FIRST_META_REGIONINFO in the following areas:
> 1) .META. table update with user region info.
> 2) .META. regions assignment.
> 3) .META. table split handling.
> Perhaps we don't have such requirement until we scale to really large number of regions
like 1M.

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