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From Yu Li <car...@gmail.com>
Subject Re: In which configuration file to configure the "fs.inmemory.size.mb" parameter?
Date Thu, 01 Jul 2010 09:33:55 GMT
Hi Sriguru,

Thanks for your comments. Do you know how to set this parameter?

Best Regards,

2010/7/1 Srigurunath Chakravarthi <sriguru@yahoo-inc.com>:
> Carp,
>  IMHO, .20.x has it. fs.inmemory.size.mb is the reduce-side equivalent of io.sort.mb.
In the reducer tasks, intermediate map output is collected into a buffer (who size is governed
by this parameter's value), and data is flushed into files as (partially) sorted KVs.
>  These files will be re-merged if we end up with more than io.sort.factor number of
files, else KVs will be served out of these files to the reduce function directly.
>  I don't know where in the code it is though, sorry.
> cheers,
> Sriguru
>>-----Original Message-----
>>From: Yu Li [mailto:carp84@gmail.com]
>>Sent: Thursday, July 01, 2010 1:12 PM
>>To: common-user@hadoop.apache.org
>>Subject: In which configuration file to configure the
>>"fs.inmemory.size.mb" parameter?
>>Hi all,
>>I looked through the "Cluster Setup" guide under link
>>http://hadoop.apache.org/common/docs/r0.20.1/cluster_setup.html and
>>found there's a "fs.inmemory.size.mb" parameter for specifying memory
>>allocated for the in-memory file-system used to merge map-outputs at
>>the reduces, and this parameter is set in the "core-site.xml". But
>>when I checked the "core-default.xml" under path
>>"$HADOOP_HOME/src/core/", I didn't find the parameter at all, nor
>>could I find the parameter through JTUI after lauching jobs.
>>Does anybody know about this parameter? Has it been removed from
>>release 0.20.X? If it hasn't been removed, how could I set the
>>parameter besides using the -D option? Thanks in advance.
>>Best Regards,

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