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From "Olga Natkovich (JIRA)" <j...@apache.org>
Subject [jira] Created: (PIG-14) large key cause pig reduce jobs to die
Date Fri, 02 Nov 2007 03:09:50 GMT
large key cause pig reduce jobs to die
--------------------------------------

                 Key: PIG-14
                 URL: https://issues.apache.org/jira/browse/PIG-14
             Project: Pig
          Issue Type: Bug
          Components: impl
            Reporter: Olga Natkovich


The reducer sends a heartbeat to the task tracker every time it starts processing new key.
The task tracker expects to
get a message every 10 minutes. If processing of an individual key takes longer, which could
be the case for your job,
the task tracker would not get a heartbeat in time and would kill the task.

The current patch is to add <property>
	<name>mapred.task.timeout</name>
	<value>0</value>
	<description>timeout value</description>
</property>

to the cluster's hadoop-site.xml. This results in disabling heartbeat functionality which
might not be what we want
long term.

A more flexible approach is to periodically report from map and reduce job via
http://lucene.apache.org/hadoop/api/org/apache/hadoop/mapred/Reporter.html#setStatus(java.lang.String)

As a workaround for a UDF, call: PigMapReduce.reporter.progress() every 1000th time




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