-Re: reduce output compression of Terasort
Binglin Chang 2012-02-17, 12:05
As far as I know, TeraOutputFormat don't support compression
On Fri, Feb 17, 2012 at 6:16 PM, <[EMAIL PROTECTED]> wrote:
> Is there any error messages on your TaskTracker logs related to
> compression like 'Codec not found' or so ?
> Bejoy K S
> From handheld, Please excuse typos.
> *From: * Juwei Shi <[EMAIL PROTECTED]>
> *Date: *Fri, 17 Feb 2012 17:48:08 +0800
> *To: *<[EMAIL PROTECTED]>
> *ReplyTo: * [EMAIL PROTECTED]
> *Subject: *Re: reduce output compression of Terasort
> We use LZO, so the value is
> mapred.output.compression.codec = com.hadoop.compression.lzo.LzoCodec
> No compressed file in HDFS.
> 2012/2/17 Bejoy Ks <[EMAIL PROTECTED]>
>> Hi Juwei
>> What is the value for mapred.output.compression.codec? It'd be
>> better to determine whether the output files are compressed by getting the
>> codec of the same and not just from the size of files.
>> On Fri, Feb 17, 2012 at 12:07 PM, Juwei Shi <[EMAIL PROTECTED]> wrote:
>>> I am benchmarking the cluster using the Terasort package of Hadoop
>>> 0.20.2. I enabled compression for both map output (*
>>> mapred.compress.map.output*) and reduce output (*mapred.output.compress*).
>>> I checked the parameter in Job.xml, both are true. I can see that the
>>> compression for Map output works, but it seems that the compression for
>>> reduce output does not work. The output of the job on HDFS is also 1TB.
>>> - Juwei
> - Juwei Shi (史巨伟)