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From Tsuyoshi Ozawa <oz...@apache.org>
Subject Re: [DISCUSS] Additional maintenance releases for Hadoop 2.y versions
Date Wed, 15 Jul 2015 05:42:48 GMT
Thank you for the notification. Trying to back port bug fixes.

- Tsuyoshi

On Wed, Jul 15, 2015 at 3:45 AM, Sean Busbey <busbey@cloudera.com> wrote:
> Hi Hadoopers!
> Over in HBase we've been discussing the impact of our dependencies on our
> downstream users. As our most fundamental dependency, Hadoop plays a big
> role in the operational cost of running an HBase instance.
> Currently the HBase 1.y release line supports Hadoop 2.4, 2.5, and 2.6[1].
> We don't drop Hadoop minor release lines in minor releases so we are
> unlikely remove anything from this set until HBase 2.0, probably at the end
> of 2015 / start of 2016 (and currently we plan to continue supporting at
> least 2.4 for HBase 2.0 [2]). Lately we've been discussing updating our
> shipped binaries to Hadoop 2.6, following some stability testing by part of
> our community[3]. Unfortunately, 2.6.0 in particular has a couple of bugs
> that could destroy HBase clusters should users decide to turn on HDFS
> encryption[4]. Our installation instructions tell folks to replace these
> jars with the version of Hadoop they are actually running, but not all
> users follow those instructions so we want to minimize the pain for them.
> Regular maintenance releases are key to keeping operational burdens low for
> our downstream users; we don't want them to be forced to choose between
> living with broken systems and stomaching the risk of upgrades across
> minor/major version numbers. Looking back over the three aforementioned
> Hadoop versions, 2.6 hasn't had a patch release since 2.6.0 came out in Nov
> 2014, when 2.5 had its last patch release as well. Hadoop 2.4 looks to be a
> year without a release[5]. On our discussion of shipping Hadoop 2.6
> binaries, one of your PMC members mentioned that with continued work on the
> 2.7 line y'all weren't planning any additional releases of the earlier
> minor versions[6].
> The HBase community requests that Hadoop pick up making bug-fix-only patch
> releases again on a regular schedule[7]. Preferably on the 2.6 line and
> preferably monthly. We realize that given the time gap since 2.6.0 it will
> likely take a big to get 2.6.1 together, but after that it should take much
> less effort to continue.
> [1]: http://hbase.apache.org/book.html#hadoop
> [2]: http://s.apache.org/ReP
> [3]: HBASE-13339
> [4]: HADOOP-11674 and HADOOP-11710
> [5]: http://hadoop.apache.org/releases.html
> [6]: http://s.apache.org/MTY
> [7]: http://s.apache.org/ViP
> --
> Sean

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