Wei-Chiu Chuang commented on HBASE-19982:

bq. FWIW I'm -1 on 2.9.0, since it's flagged as non-production. But if 2.9.1 
was out and stable when the work started I'd want to aim for it, since it looks 
like the Hadoop community is phasing out maintenance releases on anything other 
than the latest minor release.

The Hadoop community is gearing up for a 2.9.1 RC0, BTW.
2.7 -- LinkedIn is still on it, so expect to have more releases coming out of 
it. At least LinkedIn is running a 2.7.6 release vote now.
2.8 -- Yahoo! is on 2.8.x and I don't expect them to bump up soon. 2.8.4 is in 
2.9 -- I am not sure any large deployment is running it in production though.

Yep. And there are 3.0.2 and 3.1.0. I'm not sure why we are having so many 
parallel releases. But as long as one of the large Hadoop user is still on a 
release, you can expect more maintenance release will come out of it.

> Hadoop 2.8 and 2.9 Compatability
> --------------------------------
>                 Key: HBASE-19982
>                 URL: https://issues.apache.org/jira/browse/HBASE-19982
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Mike Drob
>            Priority: Major
> Hadoop 2.8.3 and 2.9.0 are both releases, and we haven't been keeping up with 
> them.
> Several tasks we need to do here, will define them in sub tasks as we go 
> along.

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