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https://issues.apache.org/jira/browse/PIG-5118?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rohini Palaniswamy updated PIG-5118:
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Attachment: PIG-5118-1.patch
> Script fails with Invalid dag containing 0 vertices
> ---------------------------------------------------
>
> Key: PIG-5118
> URL: https://issues.apache.org/jira/browse/PIG-5118
> Project: Pig
> Issue Type: Bug
> Components: tez
> Reporter: Rohini Palaniswamy
> Assignee: Rohini Palaniswamy
> Fix For: 0.17.0, 0.16.1
>
> Attachments: PIG-5118-1.patch
>
>
> The current code of splitting DAG does not handle cases where there is
> split and a clean segmentation is not possible. It also does not handle cases
> where there is multiple segments and they are later used together. Both cases
> it ends up with "Invalid dag containing 0 vertices" error as it creates one
> empty DAG and and a new DAG which contains the full original plan as it was
> not able to segment.
> Usually can ask user to get rid of unnecessary store and then load if in same
> script as it is usually a result of bad programming and inefficient. But in
> this case they were part of different large scripts and run as below.
> {code:title=script.pig}
> run -param output=output1 script1.pig --stores to output1
> run -param input=output1 script2.pig -- load from output1
> {code}
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