stack commented on HBASE-20278:

[~uagashe] You up for this one? You have good stuff going on over in 
HBASE-18792... especially your list of what works and what does not.

> [DOC] include ref guide updates for HBase 2.0 HBCK
> --------------------------------------------------
>                 Key: HBASE-20278
>                 URL: https://issues.apache.org/jira/browse/HBASE-20278
>             Project: HBase
>          Issue Type: Sub-task
>          Components: documentation, hbck
>    Affects Versions: 2.0.0
>            Reporter: Sean Busbey
>            Priority: Critical
> Called out by [~stack] in HBASE-19158
> {quote}
> bq. HBCK tool from an earlier release against an HBase 2.0+ cluster will 
> destructively alter said cluster in unrecoverable ways.
> Footnote or callout that says something like "Unfortunately we are unable to 
> distinguish an HBCK client so cannot put in place guards against destructive 
> HBCK changes....." .... probably too much for this startup section on reread 
> of what I've written here.
> bq. As of HBase 2.0, HBCK is a read-only tool that can report the status of 
> some non-public system internals. You should not rely on the format nor 
> content of these internals to remain consistent across HBase releases.
> Ugh. We need HBCK2 and a pointer here to it. Will do in a follow-on.
> {quote}
> then update the upgrade section to point to the docs

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