[jira] Updated: (PIG-14) large key cause pig reduce jobs to die

["Olga Natkovich (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PIG-14?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Olga Natkovich updated PIG-14:
------------------------------

    Attachment: heartbeat.patch

Please review the patch. All unit tests including the new ones are passing. about 80 end-to-end tests are passing. Finally and large data test that used to have this problem now does now show it.

> 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
>            Assignee: Olga Natkovich
>         Attachments: heartbeat.patch
>
>
> 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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