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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11164) Document and test rolling updates from 0.98 -> 1.0
Date Thu, 23 Oct 2014 20:36:35 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11164?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14181911#comment-14181911
] 

stack commented on HBASE-11164:
-------------------------------

Tried to restart the 0.96 master and got this:

{code}
2014-10-23 11:19:32,251 FATAL [master-c2020.halxg.cloudera.com,60000,1414088359278] master.HMaster:
Unhandled exception. Starting shutdown.
java.lang.NullPointerException
	at org.apache.hadoop.hbase.util.Bytes.toBytes(Bytes.java:441)
	at org.apache.hadoop.hbase.zookeeper.ClusterId.setClusterId(ClusterId.java:72)
	at org.apache.hadoop.hbase.master.HMaster.finishInitialization(HMaster.java:581)
	at org.apache.hadoop.hbase.master.HMaster.run(HMaster.java:433)
	at java.lang.Thread.run(Thread.java:745)
{code}

Second time around it worked.

On a good note, the branch-1 shell works with 0.96 cluster though it can't 'see' the namespace
table.  Can scan hbase:meta but not hbase:namespace. Digging.


> Document and test rolling updates from 0.98 -> 1.0
> --------------------------------------------------
>
>                 Key: HBASE-11164
>                 URL: https://issues.apache.org/jira/browse/HBASE-11164
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Enis Soztutar
>            Assignee: stack
>            Priority: Critical
>             Fix For: 0.99.2
>
>
> I think 1.0 should be rolling upgradable from 0.98 unless we break it intentionally for
a specific reason. Unless there is such an issue, lets document that 1.0 and 0.98 should be
rolling upgrade compatible. 
> We should also test this before the 0.99 release. 



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