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From Ian Holsman <had...@holsman.net>
Subject Re: DISCUSSION: Cut a hadoop-0.20.0-append release from the tip of branch-0.20-append branch?
Date Thu, 23 Dec 2010 00:05:57 GMT
Hi St.Ack.

In general I'm opposed to such a thing.

There are already 5 Hadoop 20.x releases out there, I don't think there is a need for another.
(personal opinion, not a veto or speaking as the chair)

Is there a reason why we couldn't create a hadoop 0.20.3 release that has this patch inside
of it, as well as other fixes that have been applied since 0.20.2 (~26 patches)? Would this
be too much effort for you to RM?.. 

I understand there is a large QA effort you would be taking on if you do.

does the Append/Sync semantics break/deviate too much from 0.20.2 ?

I really don't want to come to a^h^h^h^hget out of the situation where we have multiple releases
of 0.20 each with a unique feature.

On Dec 23, 2010, at 10:30 AM, Stack wrote:

> I propose cutting a release from the tip of the branch-0.20-append
> branch [1].  I suggest the release be called hadoop-0.20.0-append.  I
> volunteer to run the release process. Are folks OK with this?
> Here's some background.
> The branch-0.20-append was forked from branch-0.20 a few months ago by
> Dhruba to add an append/sync to 0.20.x era HDFS.  The added append
> facility is made of the patches attached to HDFS-200 and then a bunch
> of fixup patches done by Dhruba, Hairong, Nicolas, Todd, and others.
> For a complete list of differences from the tip of the Hadoop
> branch-0.20, see the CHANGE.txt file in branch-0.20-append [2].  The
> HDFS-200 append/sync is not the same as the append/sync implementation
> that is in hadoop 0.21.x and hadoop TRUNK.
> The branch-0.20-append is a relatively small deviation from hadoop
> 0.20.x for those who want an append/sync in an (Apache) hadoop 0.20.x
> [3].  Its for those unwilling to upgrade their clusters to hadoop
> 0.21.0 and for those who can't wait on the coming hadoop 0.22.0.  For
> applications like HBase [4], an application that runs on HDFS and
> "loses data" if no working append/sync, its critical that there is an
> Apache release with a working append/sync.
> A few of us have been playing with this branch with a while and it
> seems to do the right thing.  Its fairly close to what FB runs
> internally (correct me if I'm wrong in this last statement Dhruba).
> Thanks,
> St.Ack
> 1. http://svn.apache.org/viewvc/hadoop/common/branches/branch-0.20-append/
> 2. http://svn.apache.org/viewvc/hadoop/common/branches/branch-0.20-append/CHANGES.txt?view=markup
> 3. Cloudera's CDH3Beta2/3 already include an append/sync based off the
> HDFS-200++ work.   There is no 'official' Apache hadoop 0.20.x with a
> working append/sync.
> 4. http://hbase.apache.org

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