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https://issues.apache.org/jira/browse/HBASE-11726?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14115440#comment-14115440
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Jimmy Xiang commented on HBASE-11726:
-------------------------------------
+1
> Master should fail-safe if starting with a pre 0.96 layout
> ----------------------------------------------------------
>
> Key: HBASE-11726
> URL: https://issues.apache.org/jira/browse/HBASE-11726
> Project: HBase
> Issue Type: Bug
> Components: master
> Affects Versions: 0.96.2, 0.99.0, 0.98.5, 2.0.0
> Reporter: Esteban Gutierrez
> Assignee: Esteban Gutierrez
> Priority: Critical
> Attachments: HBASE-11726.v0.diff, HBASE-11726.v1.diff,
> HBASE-11726.v2.diff
>
>
> We recently saw this: If user inadvertently starts the HBase Master after
> deploying new HBase binaries (any version that supports namespaces), the
> HMaster will start the migration to PBs the the {{hbase.version}} file per
> HBASE-5453 and that will write a new version file PB-serialized but with the
> old version number. Further restarts of the master will fail because the
> hbase version file has been migrated to PBs and there will be version
> mismatch. The right approach should be to fail safe the master if we find an
> old {{hbase.version}} file in order to force user to run upgrade tool.
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