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From "Jean-Daniel Cryans (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4213) Support for fault tolerant, instant schema updates with out master's intervention (i.e with out enable/disable and bulk assign/unassign) through ZK.
Date Thu, 03 Nov 2011 23:27:32 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4213?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13143605#comment-13143605
] 

Jean-Daniel Cryans commented on HBASE-4213:
-------------------------------------------

First time I tried it on my cluster, all 15 region servers died with this just after calling
the alter (which returned successfully):

{quote}
2011-11-03 23:17:49,996 ERROR org.apache.hadoop.hbase.master.HMaster: Region server sv4r27s44,62023,1320362227032
reported a fatal error:
ABORTING region server sv4r27s44,62023,1320362227032: Unhandled exception: null
Cause:
java.lang.NullPointerException
	at org.apache.hadoop.hbase.regionserver.HRegionServer.createRegionLoad(HRegionServer.java:1001)
	at org.apache.hadoop.hbase.regionserver.HRegionServer.buildServerLoad(HRegionServer.java:800)
	at org.apache.hadoop.hbase.regionserver.HRegionServer.tryRegionServerReport(HRegionServer.java:776)
	at org.apache.hadoop.hbase.regionserver.HRegionServer.run(HRegionServer.java:678)
	at java.lang.Thread.run(Thread.java:662)
{quote}
                
> Support for fault tolerant, instant schema updates with out master's intervention (i.e
with out enable/disable and bulk assign/unassign) through ZK.
> ----------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 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: 4213-0.92.txt, 4213-101211-Support_instant_schema_changes_through_ZK.patch,
4213-102511.patch, 4213-Instant_Schema_change_through_ZK.patch, 4213-Nov-2-2011_patch_.patch,
4213-V10-Support_instant_schema_changes_through_ZK.patch, 4213-V5-Support_instant_schema_changes_through_ZK.patch,
4213-V7-Support_instant_schema_changes_through_ZK.patch, 4213-V8-Support_instant_schema_changes_through_ZK.patch,
4213-V9-Support_instant_schema_changes_through_ZK.patch, 4213-v9.txt, 4213.v6, 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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