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https://issues.apache.org/jira/browse/FLINK-3279?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15114942#comment-15114942
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Fabian Hueske commented on FLINK-3279:
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With a hash-based reduce combiner (FLINK-2237, PR #1517) and porting distinct
from groupReduce to reduce, the cost of combining should go down.
But providing the option to disable it completely sounds like a good idea.
> Optionally disable DistinctOperator combiner
> --------------------------------------------
>
> Key: FLINK-3279
> URL: https://issues.apache.org/jira/browse/FLINK-3279
> Project: Flink
> Issue Type: New Feature
> Components: DataSet API
> Affects Versions: 1.0.0
> Reporter: Greg Hogan
> Priority: Minor
>
> Calling {{DataSet.distinct()}} executes {{DistinctOperator.DistinctFunction}}
> which is a combinable {{RichGroupReduceFunction}}. Sometimes we know that
> there will be few duplicate records and disabling the combine would improve
> performance.
> I propose adding {{public DistinctOperator<T> setCombinable(boolean
> combinable)}} to {{DistinctOperator}}.
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