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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 Sun, 21 Aug 2011 21:18:27 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4213?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13088462#comment-13088462
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Subbu M Iyer commented on HBASE-4213:
-------------------------------------

Latest patch includes the following changes:

1. Load balancer will be turned off (if already enabled) before an instant schema change operation.
2. Load balancer will be turned on (if was on before the instant schema change).
3. Added a ZK based check instead of sleep timer for couple of tests. 
4. Master stores the number of online RS while creating the schema change node. On completion
the master compares against this count (rather than current number of active RS which might
have changed during the schema change operation) with number of active RS to determine if
all the RS have completed the schema change operation. 

> 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, HBASE-4213_Instant_schema_change_-Version_2_.patch,
HBASE_Instant_schema_change-version_3_.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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