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From Suresh Srinivas <sur...@hortonworks.com>
Subject Re: [VOTE] Merge HDFS-5535 Rolling Upgrade Improvement
Date Tue, 25 Feb 2014 21:52:47 GMT
+1 for merging the feature to trunk.

Main goal of HDFS-3225 was rolling upgrade. I have resolved it, given the
umbrella jira addresses it.


On Tue, Feb 25, 2014 at 1:41 PM, Tsz Wo Sze <szetszwo@yahoo.com> wrote:

> Hi hdfs-dev,
>
> We propose merging the HDFS-5535 branch to trunk.
>
> HDFS Rolling Upgrade is a feature to allow upgrading individual HDFS
> daemons.  In Hadoop v2, HDFS supports highly-available (HA) namenode
> services and wire compatibility. These two capabilities make it feasible to
> upgrade HDFS without incurring HDFS downtime.  We make such improvement in
> the HDFS-5535 branch.
>
> The HDFS-5535 branch is ready to be merged to trunk.  As this being
> written, there are 48 subtasks in HDFS-5535; 44 subtasks are already
> completed.  The core developments including feature development, unit tests
> and user doc, are already done.  The merge patch posted a few ago already
> passed Jenkins.  I will post a updated patch to trigger Jenkins again for
> the latest code base.
>
> The remaining JIRAs are:
>
> HDFS-3225: Revist upgrade snapshots, roll back, finalize to enable rolling
> upgrades (assigned to Sanjay)
> HDFS-6000: Avoid saving namespace when starting rolling upgrade (assigned
> to Jing)
> HDFS-6013: add rollingUpgrade information to  latest UI (assigned to Vinay)
> HDFS-6016: Update datanode replacement policy to make writes more robust
> (assigned to Kihwal)
>
> HDFS-6000 will be committed soon.  All other issues are further
> improvements which can be done after merge.
>
> The other remaining works are:
> - Revise the design doc
> - Post a test plan (Haohui is working on it.)
> - Execute the manual tests (Haohui and Fengdong will work on it.)
>
> The work was a collective effort of Nathan Roberts, Sanjay Radia, Suresh
> Srinivas, Kihwal Lee, Jing Zhao, Arpit Agarwal, Brandon Li, Haohui Mai,
> Vinayakumar B, Fengdong Yu, Chris Nauroth and Tsz-Wo Nicholas Sze, who have
> proposed the design, worked on the code, reviewed patches, tested the
> features and authored documentation.  We thank everyone that who has gave
> us valuable comments and feedback on the feature.
>
> The vote runs for 7 days.  Here is my +1 on the merge.
>
> Thanks.
> Tsz-Wo




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