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https://issues.apache.org/jira/browse/PIG-3975?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14014264#comment-14014264
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Koji Noguchi commented on PIG-3975:
-----------------------------------
Due to the missing dependency, job_1399356417814_189122 may have some tasks
receive empty scalar value since file is not created yet.
This issue became more observable after PIG-2629 where we added caching instead
of retrying when previous value was null. (Instead of missing scalar value for
*some* records, now scalar value is empty for the entire task.)
> Multiple Scalar reference calls leading to missing records
> ----------------------------------------------------------
>
> Key: PIG-3975
> URL: https://issues.apache.org/jira/browse/PIG-3975
> Project: Pig
> Issue Type: Bug
> Affects Versions: 0.8.1, 0.9.2, 0.10.1, 0.11.1, 0.12.2
> Reporter: Koji Noguchi
> Assignee: Koji Noguchi
> Priority: Critical
>
> We noticed that multiple pig runs with same input were producing different
> outputs.
> Simplified script looked like this.
> {noformat}
> A = load 'input1' as (a1:int);
> B = group A by a1 parallel 200;
> C = load 'input2' as (c1:int);
> D = foreach C generate B.$0;
> store D into '/tmp/deletemeD';
> E = load 'input3' as (c1:int);
> F = foreach E generate B.$0;
> store F into '/tmp/deletemeF';
> {noformat}
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