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From "Dror, Ittay" <id...@akamai.com>
Subject Re: Why is Hadoop always running just 4 tasks?
Date Wed, 11 Dec 2013 19:28:46 GMT
Thank you.

The command is:
hadoop jar /tmp/Algo-0.0.1.jar com.twitter.scalding.Tool com.akamai.Algo --hdfs --header --input
/algo/input{0..3}.gz --output /algo/output

Btw, the Hadoop version is 1.2.1

Not sure what driver you are referring to.

From: Mirko Kämpf <mirko.kaempf@gmail.com<mailto:mirko.kaempf@gmail.com>>
Reply-To: "user@hadoop.apache.org<mailto:user@hadoop.apache.org>" <user@hadoop.apache.org<mailto:user@hadoop.apache.org>>
Date: Wednesday, December 11, 2013 6:21 PM
To: "user@hadoop.apache.org<mailto:user@hadoop.apache.org>" <user@hadoop.apache.org<mailto:user@hadoop.apache.org>>
Subject: Re: Why is Hadoop always running just 4 tasks?


what is the command you execute to submit the job?
Please share also the driver code ....

So we can troubleshoot better.

Best wishes

2013/12/11 Dror, Ittay <idror@akamai.com<mailto:idror@akamai.com>>
I have a cluster of 4 machines with 24 cores and 7 disks each.

On each node I copied from local a file of 500G. So I have 4 files in hdfs with many blocks.
My replication factor is 1.

I run a job (a scalding flow) and while there are 96 reducers pending, there are only 4 active
map tasks.

What am I doing wrong? Below is the configuration








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