Author: cutting
Date: Tue Jul 26 09:41:37 2005
New Revision: 225345
URL: http://svn.apache.org/viewcvs?rev=225345&view=rev
Log:
Recommend primes, as keys are hashed into number of reduce tasks, and
number of map tasks is sometimes used as number of reduce tasks. Primes
smooth hashing.
Modified:
lucene/nutch/branches/mapred/conf/nutch-default.xml
Modified: lucene/nutch/branches/mapred/conf/nutch-default.xml
URL:
http://svn.apache.org/viewcvs/lucene/nutch/branches/mapred/conf/nutch-default.xml?rev=225345&r1=225344&r2=225345&view=diff
==============================================================================
--- lucene/nutch/branches/mapred/conf/nutch-default.xml (original)
+++ lucene/nutch/branches/mapred/conf/nutch-default.xml Tue Jul 26 09:41:37 2005
@@ -393,8 +393,8 @@
<name>mapred.map.tasks</name>
<value>1</value>
<description>The default number of map tasks per job. Typically set
- to a multiple of the number of available hosts. Ignored when
- mapred.job.tracker is "local".
+ to a prime several times greater than number of available hosts.
+ Ignored when mapred.job.tracker is "local".
</description>
</property>
@@ -402,7 +402,7 @@
<name>mapred.reduce.tasks</name>
<value>1</value>
<description>The default number of reduce tasks per job. Typically set
- to a multiple of the number of available hosts. Ignored when
+ to a prime close to the number of available hosts. Ignored when
mapred.job.tracker is "local".
</description>
</property>
