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From "Alex Liu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-5544) Hadoop jobs assigns only one mapper in task
Date Mon, 27 May 2013 22:13:20 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-5544?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13667980#comment-13667980
] 

Alex Liu commented on CASSANDRA-5544:
-------------------------------------

Yes, if vnode is enale, it creates a lot of smaller splits (which is not preferred, we will
fix the vnode hadoop too many small splits issue later), so can you test it with vnode disable.
                
> 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
>         Attachments: 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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