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From Devaraj k <devara...@huawei.com>
Subject RE: How to get the HDFS I/O information
Date Wed, 25 Apr 2012 06:31:56 GMT
Hi Qu,

     You can access the HDFS read/write bytes for each task or job level using the below counters.

FileSystemCounters :  HDFS_BYTES_READ  

These can be accessed by using UI or API.


From: George Datskos [george.datskos@jp.fujitsu.com]
Sent: Wednesday, April 25, 2012 6:36 AM
To: mapreduce-user@hadoop.apache.org
Subject: Re: How to get the HDFS I/O information


Every job has a history file that is, by default, stored under
$HADOOP_LOG_DIR/history.  These "job history" files list the amount of
hdfs read/write (and lots of other things) for every task.

On 2012/04/25 7:25, Qu Chen wrote:
> Let me add, I'd like to do this periodically to gather some
> performance profile information.
> On Tue, Apr 24, 2012 at 5:47 PM, Qu Chen <chenqu123@gmail.com
> <mailto:chenqu123@gmail.com>> wrote:
>     I am trying to gather the info regarding the amount of HDFS
>     read/write for each task in a given map-reduce job. How can I do that?

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