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From Alex Luya <alexander.l...@gmail.com>
Subject Re: Enabling LZO compression of map outputs in Cloudera Hadoop 0.20.1
Date Sun, 08 Aug 2010 01:18:45 GMT
Does it(hadoop-lzo) only work for hadoop 0.20,not work for 0.21 or 0.22? 
On Friday, August 06, 2010 09:05:47 am Todd Lipcon wrote:
> On Thu, Aug 5, 2010 at 4:52 PM, Bobby Dennett <bdennett@gmail.com> wrote:
> > Hi Josh,
> > 
> > No real pain points... just trying to investigate/research the "best"
> > way to create the necessary libraries and jar files to support LZO
> > compression in Hadoop. In particular, there are the 2 "repositories"
> > to build from and I am trying to find out if one should be used over
> > the other. For instance, in your previous posting, you refer to
> > hadoop-gpl-compression while the Twitter blog post from last year
> > mentions the Hadoop-LZO project. Briefly looking, it seems Hadoop-LZO
> > is preferable but we're curious if there are any caveats/gotchas we
> > should be aware of.
> 
> Yes, definitely use the hadoop-lzo project from github -- either from my
> repo or from kevinweil's (the two are kept in sync)
> 
> The repo on Google Code has a number of known bugs, which is why we forked
> it over to github last year.
> 
> -Todd
> 
> On Thu, Aug 5, 2010 at 15:59, Josh Patterson <josh@cloudera.com> wrote:
> > > Bobby,
> > > 
> > > We're working hard to make compression easier, the biggest hurdle
> > > currently is the licensing issues around the LZO codec libs (GPL,
> > > which is not compatible with ASF bsd-style license).
> > > 
> > > Outside of making the changes to the mapred-site.xml file, with your
> > > setup would do you view as the biggest pain point?
> > > 
> > > Josh Patterson
> > > Cloudera
> > > 
> > > On Thu, Aug 5, 2010 at 6:52 PM, Bobby Dennett
> > > 
> > > <bdennett+software@gmail.com <bdennett%2Bsoftware@gmail.com>> wrote:
> > >> We are looking to enable LZO compression of the map outputs on our
> > >> Cloudera 0.20.1 cluster. It seems there are various sets of
> > >> instructions available and I am curious what your thoughts are
> > >> regarding which one would be best for our Hadoop distribution and OS
> > >> (Ubuntu 8.04 64-bit). In particular, hadoop-gpl-compression
> > >> (http://code.google.com/p/hadoop-gpl-compression) vs. hadoop-lzo
> > >> (http://github.com/kevinweil/hadoop-lzo).
> > >> 
> > >> Some of what appear to be the better instructions/guides out there:
> > >> * Josh Patterson's reply on June 25th to the "Newbie to HDFS
> > >> compression" thread --
> > 
> > http://mail-archives.apache.org/mod_mbox/hadoop-common-user/201006.mbox/%
> > 3CAANLkTileo-q8USEiP8Y3Na9pDYHlyUFIPpR0In0LkpJm@mail.gmail.com%3E
> > 
> > >> * hadoop-gpl-compression FAQ --
> > >> http://code.google.com/p/hadoop-gpl-compression/wiki/FAQ
> > >> * "Hadoop at Twitter (part 1): Splittable LZO Compression" blog post
> > >> --
> > 
> > http://www.cloudera.com/blog/2009/11/hadoop-at-twitter-part-1-splittable-
> > lzo-compression/
> > 
> > >> Thanks in advance,
> > >> -Bobby

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