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From stack <saint....@gmail.com>
Subject Re: Query reg hbase and hadoop append
Date Tue, 04 Jan 2011 16:23:23 GMT
Here are the list of changes that go to make up 0.20-append:
http://svn.apache.org/viewvc/hadoop/common/branches/branch-0.20-append/CHANGES.txt?revision=1044210&view=markup

My guess is that it'd be a bit of an undertaking adding in all the
patches from this branch.  You don't want to just run the branch?  Or
there is also Cloudera' CDH?

St.Ack

On Mon, Jan 3, 2011 at 9:55 PM, Gokulakannan M <gokulm@huawei.com> wrote:
> Hello,
>
>
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>      I want to merge the append feature from hadoop 0.20-append to the
> hadoop 0.20.1 release which I am using currently.
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>      Can you please give the roadmap for append implementation in hadoop
> 0.20-append(JIRA issues or related details)? All I know is HDFS-200 only :(
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> Thanks and Regards,
>
> Gokul
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>
> -----Original Message-----
> From: Gokulakannan M [mailto:gokulm@huawei.com]
> Sent: Wednesday, December 29, 2010 10:53 AM
> To: user@hbase.apache.org
> Cc: saint.ack@gmail.com
> Subject: RE: Query reg hbase and hadoop append
>
>
>
> Thank you St.Ack.
>
>
>
> This helps a lot.. :)
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>
> -----Original Message-----
>
> From: saint.ack@gmail.com [mailto:saint.ack@gmail.com] On Behalf Of Stack
>
> Sent: Tuesday, December 28, 2010 11:02 PM
>
> To: user@hbase.apache.org; gokulm@huawei.com
>
> Subject: Re: Query reg hbase and hadoop append
>
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> We have been concentrating on delivering an hbase that works with
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> hadoop's branch-0.20-append branch and CDH3.  We've not spent time on
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> proofing an hbase on top of hadoop 0.21.  I myself haven't tried it in
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> a while. There is reflection code around the sync call which tries to
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> figure which version of Hadoop we are on top of.  I'd imagine that
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> while it might work, it might not be as performant as when run against
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> hadoop 0.20 append since this is where we've been spending our time.
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> Here is our story on hadoop versions for the coming 0.90.0:
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> http://people.apache.org/~stack/hbase-0.90.0-candidate-2/docs/notsoquick.htm
>
> l#hadoop
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> (Is this clear?  Should we add anything?).
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> As to why we're in this state where we are NOT up against the latest
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> version of hadoop, the story is a little involved.  I'll spare you the
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> torturous detail.  In short, the next major HBase release was to run
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> against hadoop 0.21 but when we learned, belatedly, that its release
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> was delayed with no guarantees regards when it would drop and that it
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> was not going to be installed (or tested) by the 'big boys' -- Y!, FB,
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> etc. -- we lost all enthusiasm for hadoop 0.21.  We figured no one
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> would run an hadoop 0.21 in production.
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> Our focus shifted to the append branch in 0.20 because this was a
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> relatively minor deviation from the pervasive hadoop 0.20.  We could
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> envision folks installing the append branch to get an hbase
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> that-did-not-lose-data and running this hadoop in production because
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> it was close enough to hadoop 0.20 and at least one of the big teams
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> was running it -- i.e. fb -- or something very close to it.  A bunch
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> of effort was sunk into making sure HBase worked on this branch and
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> that it was performant.
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> Cloudera's CDH3 since b2 has had an append.  Its provenance is the
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> hadoop 0.20-append branch.  Not hadoop 0.21.
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> Hope this helps,
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> St.Ack
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> On Tue, Dec 28, 2010 at 12:43 AM, Gokulakannan M <gokulm@huawei.com> wrote:
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>> hadoop 0.21.0 has been released with the stable hdfs append feature..
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>> Should we do anything in hbase(modify / apply some patch) to use this hdfs
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>> append feature or hbase takes care of this in-built??
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>> from web i've seen that this append feature(hdfs-265) is different from
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> what
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>> hbase expects(hdfs-200)..
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>> can anyone pls explain the background???
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>>  Thanks,
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>>  Gokul
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