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From Todd Lipcon <t...@cloudera.com>
Subject Re: [VOTE] Commit hdfs-1024 to 0.20 branch
Date Fri, 02 Apr 2010 17:41:22 GMT
On Fri, Apr 2, 2010 at 10:38 AM, Stack <stack@duboce.net> wrote:

> Please on committing HDFS-1024 to the hadoop 0.20 branch.
>
> Background:
>
> HDFS-1024 fixes possible trashing of fsimage because of failed copy
> from 2NN and NN.  Ordinarily, possible corruption of this proportion
> would merit commit w/o need of a vote only Dhruba correctly notes that
> UNLESS both NN and 2NN are upgraded, HDFS-1024 becomes an incompatible
> change (the NN<->2NN communication will fail always).  IMO, this
> incompatible change can be plastered over with a release note; e.g.
> WARNING, you MUST update NN and 2NN when you go to 0.20.3 hadoop.  If
> you agree with me, please vote +1 on commit.
>

+1. If I recall correctly the NN and 2NN already do a very strict version
check in branch 20, so it's not any more incompatible than any other change.
(I think Dhruba made the version check less strict in the FB branch)

-Todd



-- 
Todd Lipcon
Software Engineer, Cloudera

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