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Jacob Tolar commented on TEZ-3849:
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[~kshukla] see latest patch or updated PR.
Unfortunately PartitionFilter can't easily be updated to call hasNext() on the iterator it
wraps, so I had to add a kludgy peekPartition method to PartitionedRawKeyValueIterator.
> Combiner+PipelinedSorter silently drops records
> -----------------------------------------------
>
> Key: TEZ-3849
> URL: https://issues.apache.org/jira/browse/TEZ-3849
> Project: Apache Tez
> Issue Type: Bug
> Reporter: Jacob Tolar
> Assignee: Jacob Tolar
> Attachments: TEZ-3849.1.patch, TEZ-3849.2.patch, TEZ-3849.3.patch
>
>
> This bug was introduced in https://github.com/apache/tez/commit/a47e8fcbea5eeab5a7cf812271d329524cc02dba?diff=split
> when combiner != null, the change in this commit passes kvIter with next() having already
been called. This ends up (silently) dropping the first record in the partition.
> Will submit PR and attach patch. [~jeagles], not sure if this is the way you want to
fix or not but it does fix my tests.
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