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https://issues.apache.org/jira/browse/HBASE-20279?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16412410#comment-16412410
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Sean Busbey commented on HBASE-20279:
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maybe worth including the {{hbase upgrade}} command again? too confusing?
> [tooling] check for incompatible environment for HBase 2.0 upgrade
> ------------------------------------------------------------------
>
> Key: HBASE-20279
> URL: https://issues.apache.org/jira/browse/HBASE-20279
> Project: HBase
> Issue Type: Sub-task
> Components: documentation, tooling
> Affects Versions: 2.0.0
> Reporter: Sean Busbey
> Priority: Critical
>
> from [~stack] on HBASE-19158:
> {quote}
> bq. Server failure. HBase can still read HFiles written in the older version
> 2 format.
> Need a script that user can run pre-upgrade.
> {quote}
> Additional commentary from [~busbey]
> In addition to the config check stack mentions, such a tool could check
> * other problematic configs, like those for master-hosts-regions
> * inconsistent configs due to changed defaults (I think we should have some
> smell-tests around the change in default for hbase.security.authorization)
> * (optionally) check for unreadable WALs
> * (optionally) check for unreadable hfiles
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