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https://issues.apache.org/jira/browse/HBASE-11164?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14181694#comment-14181694
 ] 

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

Trying to go from 0.96 to 0.99.  I stopped the 0.96 master in a 0.96 cluster 
and tried to start the 0.99 master and got below:

{code}
2014-10-23 11:12:37,537 FATAL [c2020:16020.activeMasterManager] master.HMaster: 
Unhandled exception. Starting shutdown.
org.apache.hadoop.hbase.TableNotFoundException: hbase:namespace
        at 
org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.locateRegionInMeta(ConnectionManager.java:1189)
        at 
org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.locateRegion(ConnectionManager.java:1090)
        at 
org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.locateRegion(ConnectionManager.java:1074)
        at 
org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.locateRegion(ConnectionManager.java:1031)
        at 
org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.getRegionLocation(ConnectionManager.java:865)
        at 
org.apache.hadoop.hbase.client.RegionServerCallable.prepare(RegionServerCallable.java:78)
        at 
org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithRetries(RpcRetryingCaller.java:110)
        at org.apache.hadoop.hbase.client.HTable.get(HTable.java:847)
        at 
org.apache.hadoop.hbase.master.TableNamespaceManager.get(TableNamespaceManager.java:138)
        at 
org.apache.hadoop.hbase.master.TableNamespaceManager.isTableAvailableAndInitialized(TableNamespaceManager.java:268)
        at 
org.apache.hadoop.hbase.master.TableNamespaceManager.start(TableNamespaceManager.java:109)
        at 
org.apache.hadoop.hbase.master.HMaster.initNamespace(HMaster.java:749)
        at 
org.apache.hadoop.hbase.master.HMaster.finishActiveMasterInitialization(HMaster.java:629)
        at org.apache.hadoop.hbase.master.HMaster.access$500(HMaster.java:157)
        at org.apache.hadoop.hbase.master.HMaster$1.run(HMaster.java:1290)
        at java.lang.Thread.run(Thread.java:745)

{code}

> 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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