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From Jean-Daniel Cryans <jdcry...@apache.org>
Subject Re: [MORE DISCUSSION] Moving hbase trunk (temporarily) back to hadoop 0.20.x (from head of the hadoop 0.21 branch)
Date Thu, 18 Mar 2010 18:34:39 GMT
I'm obviously +1

@Todd, that's the plan https://issues.apache.org/jira/browse/HBASE-2233


On Thu, Mar 18, 2010 at 11:32 AM, Todd Lipcon <todd@cloudera.com> wrote:
> +1 from me.
> To help out the guys who are already running on unreleased Hadoop, would it
> be possible to build a simple shim layer that would allow it to work with
> either? We did this in Hive and it seems to be working well (few complaints
> so far)
> -Todd
> On Thu, Mar 18, 2010 at 11:28 AM, Stack <stack@duboce.net> wrote:
>> Unless there is objection, in the next day or so, I'd like to revert
>> the hadoop that is in hbase trunk and replace it with hadoop 0.20.2.
>> Currently hbase trunk bundles the head of the 0.21 hadoop branch and
>> will only run atop an hadoop built out of this hadoop 0.21 branch.
>> Since the plan is that the next release of hbase will run on hadoop
>> 0.20.x and the major hadoop release that follows hadoop 0.20 -- 0.21
>> or 0.22, its version is still TBD -- AND given that the next major
>> hadoop release would seem to be a few months out, having our trunk
>> bundle hadoop 0.21 unnecessarily constrains where current hbase trunk
>> can run.
>> Even though the bundled hadoop 0.21 has the critical hdfs-265 working
>> flush/sync feature, its looking like hard work by the fellas who are
>> on the hdfs-200, hdfs-862 and hdfs-142 patchset will likely get us
>> data durability on a (patched) hadoop 0.20.x some time soon.  Having
>> hbase trunk so it can work on the patched hadoop 0.20.x will help the
>> testing of the data durability effort.
>> Jean-Daniel, Ryan, and I have already had a pow-wow about this and
>> think this is the way to go for now (The revert notion was originally
>> Ryans -- See HBASE-2255).
>> If you've been running hbase TRUNK and an hadoop 0.21, unfortunately,
>> this means that you'll need to copy your data out of your cluster, do
>> the downgrade, and then copy your data back in.  If you need help with
>> this effort, give us a shout and we'll help you out.
>> Thanks,
>> St.Ack
> --
> Todd Lipcon
> Software Engineer, Cloudera

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