Hello,

there is an optimization for Hadoop on Lustre FS, or any
high-performance distributed filesystem.

The research paper with test results can be found here
http://www.xyratex.com/pdfs/whitepapers/Xyratex_white_paper_MapReduce_1-4.pdf
and a presentation for LUG 2011:
http://www.olcf.ornl.gov/wp-content/events/lug2011/4-12-2011/1100-1130_Nathan_Rutman_MapReduce_Lug_2011.pptx

Basically the optimization is a replacement for http transport in
shuffle phase by simple linking target file to the source one. I
attached a draft patch against hadoop-1.0.0 to illustrate the idea.
How to push this patch upstream?

Thanks,
--

Alexander "Zam" Zarochentsev
[EMAIL PROTECTED]
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Zam,

http://wiki.apache.org/hadoop/HowToContribute is a wiki that can tell you in more detail the steps you need to do for this. In general though to push the patch upstream you want to file a Map/Reduce JIRA, and attach your patch.  After that several people from the community are likely to comment on the JIRA.  If you don't get feedback you can bug us on the dev mailing list about it.  As part of this you are also going to need to do a port to trunk, as we do not want to have new features go into any line without having it go into trunk as well.  Even though this sounds potentially complex because trunk uses YARN instead of the previous Map/Reduce specific framework both 1.0 and trunk are in the process of getting a pluggable shuffle service MAPREDUCE-4049.  It would probably be best to port your patch to be a plugin for this.  Then hopefully the porting between trunk and 1.0 will be relatively simple.

If this is the route you want to go you should put 1.1 and 3.0.0 as the target versions of the JIRA.  3.0.0 corresponds to trunk, and 1.1 is the next release of the 1 line that is accepting new major feature work.  You probably also want to link your JIRA to the MAPREDUCE-4049 JIRA as a dependency, if you are making it a plugin.

In addition because this is an optimization it would be nice to have some information in the JIRA showing the benchmarks you ran and the performance improvements you got.  Ultimately we are also going to want to have some documentation about this as well, but that is something that can come later after you lock down the code more.

--Bobby Evans
On 5/16/12 3:34 AM, "Alexander Zarochentsev" <[EMAIL PROTECTED]> wrote:

Hello,

there is an optimization for Hadoop on Lustre FS, or any
high-performance distributed filesystem.

The research paper with test results can be found here
http://www.xyratex.com/pdfs/whitepapers/Xyratex_white_paper_MapReduce_1-4.pdf
and a presentation for LUG 2011:
http://www.olcf.ornl.gov/wp-content/events/lug2011/4-12-2011/1100-1130_Nathan_Rutman_MapReduce_Lug_2011.pptx

Basically the optimization is a replacement for http transport in
shuffle phase by simple linking target file to the source one. I
attached a draft patch against hadoop-1.0.0 to illustrate the idea.
How to push this patch upstream?

Thanks,
--

Alexander "Zam" Zarochentsev
[EMAIL PROTECTED]
______________________________________________________________________
This email may contain privileged or confidential information, which should only be used for the purpose for which it was sent by Xyratex. No further rights or licenses are granted to use such information. If you are not the intended recipient of this message, please notify the sender by return and delete it. You may not use, copy, disclose or rely on the information contained in it.

Internet email is susceptible to data corruption, interception and unauthorised amendment for which Xyratex does not accept liability. While we have taken reasonable precautions to ensure that this email is free of viruses, Xyratex does not accept liability for the presence of any computer viruses in this email, nor for any losses caused as a result of viruses.

Xyratex Technology Limited (03134912), Registered in England & Wales, Registered Office, Langstone Road, Havant, Hampshire, PO9 1SA.

The Xyratex group of companies also includes, Xyratex Ltd, registered in Bermuda, Xyratex International Inc, registered in California, Xyratex (Malaysia) Sdn Bhd registered in Malaysia, Xyratex Technology (Wuxi) Co Ltd registered in The People's Republic of China and Xyratex Japan Limited registered in Japan.
______________________________________________________________________