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Posted to commits@cassandra.apache.org by "Cyril Scetbon (JIRA)" <ji...@apache.org> on 2013/06/05 15:14:20 UTC
[jira] [Commented] (CASSANDRA-5544) Hadoop jobs assigns only one
mapper in task
[ https://issues.apache.org/jira/browse/CASSANDRA-5544?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13675894#comment-13675894 ]
Cyril Scetbon commented on CASSANDRA-5544:
------------------------------------------
My tests confirm that I have multiple mappers (1025) and each mapper works on a ranges of my column family [http://pastebin.com/vL3uC5Ca]. Good job !
> Hadoop jobs assigns only one mapper in task
> --------------------------------------------
>
> Key: CASSANDRA-5544
> URL: https://issues.apache.org/jira/browse/CASSANDRA-5544
> Project: Cassandra
> Issue Type: Bug
> Components: Hadoop
> Affects Versions: 1.2.1
> Environment: Red hat linux 5.4, Hadoop 1.0.3, pig 0.11.1
> Reporter: Shamim Ahmed
> Assignee: Alex Liu
> Fix For: 1.2.6
>
> Attachments: 5544-1.txt, 5544-2.txt, 5544-3.txt, 5544.txt, Screen Shot 2013-05-26 at 4.49.48 PM.png
>
>
> We have got very strange beheviour of hadoop cluster after upgrading
> Cassandra from 1.1.5 to Cassandra 1.2.1. We have 5 nodes cluster of Cassandra, where three of them are hodoop slaves. Now when we are submitting job through Pig script, only one map assigns in task running on one of the hadoop slaves regardless of
> volume of data (already tried with more than million rows).
> Configure of pig as follows:
> export PIG_HOME=/oracle/pig-0.10.0
> export PIG_CONF_DIR=${HADOOP_HOME}/conf
> export PIG_INITIAL_ADDRESS=192.168.157.103
> export PIG_RPC_PORT=9160
> export PIG_PARTITIONER=org.apache.cassandra.dht.Murmur3Partitioner
> Also we have these following properties in hadoop:
> <property>
> <name>mapred.tasktracker.map.tasks.maximum</name>
> <value>10</value>
> </property>
> <property>
> <name>mapred.map.tasks</name>
> <value>4</value>
> </property>
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