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From "Arun C Murthy (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 Sat, 29 Jan 2011 00:20:44 GMT

    [ https://issues.apache.org/jira/browse/PIG-1829?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12988324#action_12988324
] 

Arun C Murthy commented on PIG-1829:
------------------------------------

bq. Any range in practical usage, 1 minute, 5 minutes, 1 hour, etc? It will help to set expectation
with the user.

It is number of jobs. Typically it's 1000, so that last 1k jobs are around to query status.

> "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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