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From "Santhosh Srinivasan (JIRA)" <j...@apache.org>
Subject [jira] Commented: (PIG-1829) "0" value seen in PigStat's map/reduce runtime, even when the job is successful
Date Fri, 28 Jan 2011 19:18:47 GMT

    [ https://issues.apache.org/jira/browse/PIG-1829?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12988187#action_12988187
] 

Santhosh Srinivasan commented on PIG-1829:
------------------------------------------

There are smart ways to lookup the job tracker history based on the directory structure ensuring
that you do not bring the system down. Simultaneously, we can request the MapReduce team to
create a hierarchical structure to enable such queries.

> "0" value seen in PigStat's map/reduce runtime, even when the job is successful
> -------------------------------------------------------------------------------
>
>                 Key: PIG-1829
>                 URL: https://issues.apache.org/jira/browse/PIG-1829
>             Project: Pig
>          Issue Type: Improvement
>    Affects Versions: 0.8.0
>            Reporter: Thejas M Nair
>             Fix For: 0.9.0
>
>
> Pig runtime calls JobClient.getMapTaskReports(jobId) and JobClient.getReduceTaskReports(jobId)
to get statistics about numbers of maps/reducers, as well as max/min/avg time of these tasks.
But from time to time, these calls return empty lists. When that happens pig is reports 0
values for the stats. 
> The jobtracker keeps the stats information only for a limited duration based on the configuration
parameters  mapred.jobtracker.completeuserjobs.maximum and mapred.job.tracker.retiredjobs.cache.size.
Since pig collects the stats after jobs have finished running, it is possible that the stats
for the initial jobs are no longer available. To have better chances of getting the stats,
it should be collected as soon as the job is over. 

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