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Subject: max number of map/reduce per node
From: Oleg Ruchovets <oruchovets@gmail.com>
To: user@hadoop.apache.org
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Hi
   I found that my job runs with such parameters:
mapred.tasktracker.map.tasks.maximum    4
mapred.tasktracker.reduce.tasks.maximum    2

   I try to change these parameters from my java code

    Properties properties = new Properties();
    properties.put("mapred.tasktracker.map.tasks.maximum" , "8");
    properties.put("mapred.tasktracker.reduce.tasks.maximum" , "4");

But executing the job I didn't get updated values of these parameters , it
remains:

mapred.tasktracker.map.tasks.maximum 4
mapred.tasktracker.reduce.tasks.maximum 2


Should I change the parameters on hadoop XML configuration files?


Please advice.

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<div dir=3D"ltr"><div>Hi </div><div>=A0=A0 I found that my job runs with su=
ch parameters:</div><div>mapred.tasktracker.map.tasks.maximum=A0=A0=A0 4<br=
>mapred.tasktracker.reduce.tasks.maximum=A0=A0=A0 2</div><div>=A0</div><div=
>=A0=A0 I try to change these parameters from my java code</div>
<div>=A0</div><div>=A0=A0=A0 Properties properties =3D new Properties();<br=
>=A0=A0=A0 properties.put(&quot;mapred.tasktracker.map.tasks.maximum&quot; =
, &quot;8&quot;);</div><div>=A0=A0=A0=A0properties.put(&quot;mapred.tasktra=
cker.reduce.tasks.maximum&quot; , &quot;4&quot;);</div>
<div>=A0</div><div>But executing the job I=A0didn&#39;t get updated values =
of these parameters , it remains:</div><div>=A0</div><div><div>mapred.taskt=
racker.map.tasks.maximum    4<br>mapred.tasktracker.reduce.tasks.maximum   =
 2</div>
<div>=A0</div><div>=A0</div><div>Should I change the parameters on hadoop X=
ML configuration files?</div><div>=A0</div><div>=A0</div><div>Please advice=
.</div></div><div>=A0</div><div>=A0</div><div><div>=A0</div></div><div>=A0<=
/div><div>=A0</div>
<div>=A0</div></div>

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