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https://issues.apache.org/jira/browse/PIG-3875?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13965204#comment-13965204
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Rohini Palaniswamy commented on PIG-3875:
-----------------------------------------
The patch returns EOP if right side is done. What about left side in case of
outer join?
> Fix MergeJoin_8 failure
> -----------------------
>
> Key: PIG-3875
> URL: https://issues.apache.org/jira/browse/PIG-3875
> Project: Pig
> Issue Type: Sub-task
> Components: tez
> Reporter: Daniel Dai
> Assignee: Daniel Dai
> Fix For: tez-branch
>
> Attachments: PIG-3875-1.patch
>
>
> Here is the exception I get:
> java.lang.NullPointerException
> at java.lang.String.compareTo(String.java:1167)
> at java.lang.String.compareTo(String.java:92)
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POMergeJoin.getNextTuple(POMergeJoin.java:489)
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.processInput(PhysicalOperator.java:300)
> at
> org.apache.pig.backend.hadoop.executionengine.tez.POStoreTez.getNextTuple(POStoreTez.java:90)
> at
> org.apache.pig.backend.hadoop.executionengine.tez.PigProcessor.runPipeline(PigProcessor.java:231)
> at
> org.apache.pig.backend.hadoop.executionengine.tez.PigProcessor.run(PigProcessor.java:155)
> at
> org.apache.tez.runtime.LogicalIOProcessorRuntimeTask.run(LogicalIOProcessorRuntimeTask.java:307)
> at
> org.apache.hadoop.mapred.YarnTezDagChild$5.run(YarnTezDagChild.java:562)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:394)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1495)
> at
> org.apache.hadoop.mapred.YarnTezDagChild.main(YarnTezDagChild.java:551)
> The problem is after exhausted all the records, we return a STATUS_NULL and
> keep the pipeline running, and eventually result a NPE.
> The patch fix the issue by outputing EOP when everything is done in
> POMergeJoin. Previously we did wrong, however, test do pass before PIG-3568
> (didn't spend time to figure out why).
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