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https://issues.apache.org/jira/browse/PIG-1143?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12789023#action_12789023
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Sriranjan Manjunath commented on PIG-1143:
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The file size in the documentation refers to the size on disk. In order to 
account for compression, encoding etc. a configurable parameter - 
pig.inputfile.conversionfactor is provided. I agree that this cannot be set to 
a good value for compressed data. It is just a guidance. The implications of 
setting it to a bad value are minimal - we will end up sampling little more 
than the required number of samples (unless you set it to a fraction).

> Poisson Sample Loader should compute the number of samples required only once
> -----------------------------------------------------------------------------
>
>                 Key: PIG-1143
>                 URL: https://issues.apache.org/jira/browse/PIG-1143
>             Project: Pig
>          Issue Type: Bug
>            Reporter: Sriranjan Manjunath
>            Assignee: Sriranjan Manjunath
>
> The current poisson sampler forces each of the maps to compute the sample 
> number. This is redundant and causes issues when a large directory is 
> specified in the join. The sampler should be changed to calculate the sample 
> count only once and this information should be shared with the remaining 
> mappers.

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