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From "Subbu M Iyer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4213) Support instant schema updates with out master's intervention (i.e with out enable/disable and bulk assign/unassign)
Date Thu, 18 Aug 2011 16:54:27 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4213?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13087110#comment-13087110
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Subbu M Iyer commented on HBASE-4213:
-------------------------------------


They both are checking different counts. One counts the number of
active RS at this moment (based on number of childrens of /hbase/rs)
and other counts the number of RS successfully processed the schema
change (based on number of childrens of /hbase/schema/<table name> ).

If number of RS who have processed the schema change is >= number of
active RS at this moment then master presumes that all RS have
acknowledged the schema change and hence goes ahead with delete
operation.



On Thu, Aug 18, 2011 at 6:45 AM, Ted Yu (JIRA) <jira@apache.org> wrote:


> Support instant schema updates with out master's intervention (i.e with out enable/disable
and bulk assign/unassign)
> --------------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-4213
>                 URL: https://issues.apache.org/jira/browse/HBASE-4213
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Subbu M Iyer
>            Assignee: Subbu M Iyer
>             Fix For: 0.92.0
>
>         Attachments: HBASE-4213-Instant_schema_change.patch
>
>
> This Jira is a slight variation in approach to what is being done as part of 
> https://issues.apache.org/jira/browse/HBASE-1730
> Support instant schema updates such as Modify Table, Add Column, Modify Column operations:
> 1. With out enable/disabling the table.
> 2. With out bulk unassign/assign of regions.

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