Discussion thread: https://s.apache.org/kxT1

We're down to the last few issues and are preparing the branch to
merge to trunk. We'll post merge patches to HDFS-9806 [1]. Minor,
"cleanup" tasks (checkstyle, findbugs, naming, etc.) will be tracked
in HDFS-12712 [2].

We've tried to ensure that when this feature is disabled, HDFS is
unaffected. For those reviewing this, please look for places where
this might add overheads and we'll address them before the merge. The
site documentation [3] and design doc [4] should be up to date and
sufficient to try this out. Again, please point out where it is
unclear and we can address it.

This has been a long effort and we're grateful for the support we've
received from the community. In particular, thanks to Íñigo Goiri,
Andrew Wang, Anu Engineer, Steve Loughran, Sean Mackrory, Lukas
Majercak, Uma Gunuganti, Kai Zheng, Rakesh Radhakrishnan, Sriram Rao,
Lei Xu, Zhe Zhang, Jing Zhao, Bharat Viswanadham, ATM, Chris Nauroth,
Sanjay Radia, Atul Sikaria, and Peng Li for all your input into the
design, testing, and review of this feature.

The vote will close no earlier than one week from today, 12/15. -C

[1]: https://issues.apache.org/jira/browse/HDFS-9806
[2]: https://issues.apache.org/jira/browse/HDFS-12712
[3]: 
https://github.com/apache/hadoop/blob/HDFS-9806/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HdfsProvidedStorage.md
[4]: 
https://issues.apache.org/jira/secure/attachment/12875791/HDFS-9806-design.002.pdf

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