[jira] [Commented] (CRUNCH-642) Enable numReducers option for methods in Distinct

["Josh Wills (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CRUNCH-642?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15963973#comment-15963973 ] 

Josh Wills commented on CRUNCH-642:
-----------------------------------

Pushed to master. Thanks Xavier!

> Enable numReducers option for methods in Distinct
> -------------------------------------------------
>
>                 Key: CRUNCH-642
>                 URL: https://issues.apache.org/jira/browse/CRUNCH-642
>             Project: Crunch
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 0.14.0
>            Reporter: Xavier
>            Assignee: Josh Wills
>            Priority: Trivial
>         Attachments: CRUNCH-642.patch
>
>
> The {{groupByKey}} invocation in the {{Distinct}} class currently uses the default  (recommended) number of reducers without providing an option to override this:
> {code}
> public static <S> PCollection<S> distinct(PCollection<S> input, int flushEvery) {
>   Preconditions.checkArgument(flushEvery > 0);
>   PType<S> pt = input.getPType();
>   PTypeFamily ptf = pt.getFamily();
>   return input
>       .parallelDo("pre-distinct", new PreDistinctFn<S>(flushEvery, pt), ptf.tableOf(pt, ptf.nulls()))
>       .groupByKey()
>       .parallelDo("post-distinct", new PostDistinctFn<S>(), pt);
> }
> {code}
> Would it be possible to enhance this method such that it is possible to customize the number of reducers? Either explicitly or via a {{GroupingOptions}} object.



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