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https://issues.apache.org/jira/browse/PIG-1062?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12772797#action_12772797
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Dmitriy V. Ryaboy commented on PIG-1062:
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The sampler (in this design) reads all the data, so number of records read is
total number of records in dataset, and the number of records written is total
number of samples. Same for bytes. The sampler produces a histogram file,
which is then used by the join task -- so there is no reliance on counters
there.
> load-store-redesign branch: change SampleLoader and subclasses to work with
> new LoadFunc interface
> ---------------------------------------------------------------------------------------------------
>
> Key: PIG-1062
> URL: https://issues.apache.org/jira/browse/PIG-1062
> Project: Pig
> Issue Type: Sub-task
> Reporter: Thejas M Nair
> Assignee: Thejas M Nair
>
> This is part of the effort to implement new load store interfaces as laid out
> in http://wiki.apache.org/pig/LoadStoreRedesignProposal .
> PigStorage and BinStorage are now working.
> SampleLoader and subclasses -RandomSampleLoader, PoissonSampleLoader need to
> be changed to work with new LoadFunc interface.
> Fixing SampleLoader and RandomSampleLoader will get order-by queries working.
> PoissonSampleLoader is used by skew join.
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