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