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https://issues.apache.org/jira/browse/PIG-5277?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16113820#comment-16113820
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liyunzhang_intel commented on PIG-5277:
---------------------------------------
[~szita]: give me some time to investigate #4. If also can not solve the
problem you mention in #4 in the end of next Friday(2017-08-11), directly use
#2 to solve the unit test failures.
> Spark mode is writing nulls among tuples to the output
> -------------------------------------------------------
>
> Key: PIG-5277
> URL: https://issues.apache.org/jira/browse/PIG-5277
> Project: Pig
> Issue Type: Bug
> Components: spark
> Reporter: Adam Szita
> Assignee: Adam Szita
>
> After committing PIG-3655 a couple of Spark mode tests (e.g.
> org.apache.pig.test.TestEvalPipeline.testCogroupAfterDistinct) started
> failing on:
> {code}
> java.lang.Error: java.io.IOException: Corrupt data file, expected tuple type
> byte, but seen 27
> at
> org.apache.pig.backend.hadoop.executionengine.HJob$1.hasNext(HJob.java:122)
> at
> org.apache.pig.test.TestEvalPipeline.testCogroupAfterDistinct(TestEvalPipeline.java:1052)
> Caused by: java.io.IOException: Corrupt data file, expected tuple type byte,
> but seen 27
> at
> org.apache.pig.impl.io.InterRecordReader.readDataOrEOF(InterRecordReader.java:158)
> at
> org.apache.pig.impl.io.InterRecordReader.nextKeyValue(InterRecordReader.java:194)
> at org.apache.pig.impl.io.InterStorage.getNext(InterStorage.java:79)
> at
> org.apache.pig.impl.io.ReadToEndLoader.getNextHelper(ReadToEndLoader.java:238)
> at
> org.apache.pig.impl.io.ReadToEndLoader.getNext(ReadToEndLoader.java:218)
> at
> org.apache.pig.backend.hadoop.executionengine.HJob$1.hasNext(HJob.java:115)
> {code}
> This is because InterRecordReader became much stricter after PIG-3655. Before
> it just simply skipped these bytes thinking that they are just garbage on the
> split beginning. Now when we expect a [proper tuple with a tuple type
> byte|https://github.com/apache/pig/blob/trunk/src/org/apache/pig/impl/io/InterRecordReader.java#L153]
> we see these nulls and throw an Exception.
> As I can see it this is happening because JoinGroupSparkConverter has to
> return something even when it shouldn't.
> When the POPackage operator returns a
> [POStatus.STATUS_NULL|https://github.com/apache/pig/blob/trunk/src/org/apache/pig/backend/hadoop/executionengine/spark/converter/JoinGroupSparkConverter.java#L211],
> the converter shouldn't return a thing, but it can't do better than
> returning a null. This then gets written out by Spark..
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