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Subject: mapred.tasktacker.reduce.tasks.maximum issue
From: "Vincent Y. Shen" <vincent.y.shen@gmail.com>
To: user@hadoop.apache.org
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--20cf307f31a878a6cc04eb243f6a
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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.

--20cf307f31a878a6cc04eb243f6a
Content-Type: text/html; charset=ISO-8859-1
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<div dir=3D"ltr">Hi Guys,<div><br></div><div style>I am increasing=A0mapred=
.tasktacker.reduce.tasks.maximum in the hadoop cluster. But regardless what=
ever I tried, hadoop refuses to use my value but the default (2)</div><div =
style>
<br></div><div style><br></div><div style><br></div><div style><br></div><d=
iv style>What I did do</div><div style>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D</d=
iv><div style><br></div><div style>stop mapred</div><div style>stop dfs</di=
v><div style><br></div>
<div style>update the value of=A0mapred.tasktacker.reduce.tasks.maximum</di=
v><div style><br></div><div style><br></div><div style>start dfs</div><div =
style>start mapred</div><div style><br></div><div style><br></div><div styl=
e>
But the system still uses default values</div><div style><br></div><div sty=
le><br></div><div style><br></div><div style><br></div><div style>Environme=
nt</div><div style>=3D=3D=3D=3D=3D=3D=3D=3D=3D</div><div style><br></div><d=
iv style>Hadoop version: 1.1.2</div>
<div style>Java version: 7</div><div style><br></div><div style><br></div><=
div style>Mapred-site.xml</div><div style>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D</div><div style><br></div><div style><div>&lt;property&gt;</div><div>=
=A0 &lt;name&gt;mapred.system.dir&lt;/name&gt;</div>
<div>=A0 &lt;value&gt;/hadoop/mapred/system&lt;/value&gt;</div><div>&lt;/pr=
operty&gt;</div><div><br></div><div><br></div><div><br></div><div>&lt;prope=
rty&gt;</div><div>=A0 &lt;name&gt;mapred.reduce.tasks&lt;/name&gt;</div><di=
v>
=A0 &lt;value&gt;50&lt;/value&gt;</div><div>&lt;/property&gt;</div><div><br=
></div><div>&lt;property&gt;</div><div>=A0 &lt;name&gt;mapred.tasktacker.re=
duce.tasks.maximum&lt;/name&gt;</div><div>=A0 &lt;value&gt;15&lt;/value&gt;=
</div>
<div>&lt;/property&gt;</div><div><br></div><div>&lt;property&gt;</div><div>=
=A0 &lt;name&gt;mapred.tasktacker.map.tasks.maximum&lt;/name&gt;</div><div>=
=A0 &lt;value&gt;15&lt;/value&gt;</div><div>&lt;/property&gt;</div><div><br=
>
</div><div><br></div><div>&lt;property&gt;</div><div>=A0 &lt;name&gt;mapred=
.child.java.opts&lt;/name&gt;</div><div>=A0 &lt;value&gt;-Xmx500m&lt;/value=
&gt;</div><div>&lt;/property&gt;</div><div><br></div><div><br></div><div><b=
r>
</div><div><div>&lt;property&gt;</div><div>=A0 &lt;name&gt;mapred.job.track=
er&lt;/name&gt;</div><div>=A0 &lt;value&gt;<a href=3D"http://machine1.mydom=
ain.com:54311">machine1.mydomain.com:54311</a>&lt;/value&gt;</div><div><br>=
</div>
<div>&lt;/property&gt;</div></div><div><br></div><div><br></div><div><br></=
div><div style>Thanks guys for any pointers!!!!</div><div style><br></div><=
div style><br></div><div style>Best regards,</div><div style><br></div>
<div style><br></div><div style>Vincent.</div><div><br></div><div><br></div=
></div></div>

--20cf307f31a878a6cc04eb243f6a--