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From "Vincent Y. Shen" <vincent.y.s...@gmail.com>
Subject mapred.tasktacker.reduce.tasks.maximum issue
Date Thu, 14 Nov 2013 14:53:43 GMT
Hi Guys,

I am increasing mapred.tasktacker.reduce.tasks.maximum in the hadoop
cluster. But regardless whatever I tried, hadoop refuses to use my value
but the default (2)




What I did do
===========

stop mapred
stop dfs

update the value of mapred.tasktacker.reduce.tasks.maximum


start dfs
start mapred


But the system still uses default values




Environment
=========

Hadoop version: 1.1.2
Java version: 7


Mapred-site.xml
============

<property>
  <name>mapred.system.dir</name>
  <value>/hadoop/mapred/system</value>
</property>



<property>
  <name>mapred.reduce.tasks</name>
  <value>50</value>
</property>

<property>
  <name>mapred.tasktacker.reduce.tasks.maximum</name>
  <value>15</value>
</property>

<property>
  <name>mapred.tasktacker.map.tasks.maximum</name>
  <value>15</value>
</property>


<property>
  <name>mapred.child.java.opts</name>
  <value>-Xmx500m</value>
</property>



<property>
  <name>mapred.job.tracker</name>
  <value>machine1.mydomain.com:54311</value>

</property>



Thanks guys for any pointers!!!!


Best regards,


Vincent.

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