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https://issues.apache.org/jira/browse/PIG-1453?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12879462#action_12879462
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Yan Zhou commented on PIG-1453:
-------------------------------
There are two issues that generally make some test cases (not just
TestOrderPreserveUnionHDFS) in Zebra's "pigtest" fail intermittently.
1) There is some randomness when multiple tables are unioned. The correctness
check relies on the ordering of tables in output rows, which is incorrect.
Instead the table a particular row belongs to can only be associated with the
table index in output;
2) There are some failures in PIG STORE calls as the destination directory are
not cleaned up properly before store.
> [zebra] Intermittent failure for TestOrderPreserveUnionHDFS
> -----------------------------------------------------------
>
> Key: PIG-1453
> URL: https://issues.apache.org/jira/browse/PIG-1453
> Project: Pig
> Issue Type: Bug
> Components: impl
> Affects Versions: 0.7.0, 0.8.0
> Reporter: Daniel Dai
> Fix For: 0.7.0, 0.8.0
>
>
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