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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-2626) Add a AverageAccumulator for FLINK-Accumulator
Date Mon, 07 Sep 2015 12:26:45 GMT

    [ https://issues.apache.org/jira/browse/FLINK-2626?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14733621#comment-14733621

ASF GitHub Bot commented on FLINK-2626:

Github user mjsax commented on the pull request:

    To me, the tests seems to be unstable. Maybe we need to open a JIRA for them. I will report
them on the dev mailing list.

> Add a AverageAccumulator for FLINK-Accumulator
> ----------------------------------------------
>                 Key: FLINK-2626
>                 URL: https://issues.apache.org/jira/browse/FLINK-2626
>             Project: Flink
>          Issue Type: New Feature
>          Components: Core
>    Affects Versions: 0.10
>            Reporter: Huang Wei
>             Fix For: 0.10
>   Original Estimate: 168h
>  Remaining Estimate: 168h
> Add a AverageAccumulator for Flink-Accumulator to calculate the average of values.
> The feature is like Storm-MultiReducedMetric.
> Feature in detail:
> 1.This class is named AverageAccumulator(any suggestion? I`m not good at English name)
and implements SimpleAccumulator.
> 2.This class support long, integer and double input.
> 3.This class will return a double value as the average when the method getLocalValue()
> 4.Member method description:
>   *  add():
> A variety of add() method to support different inputs(e.g. Double, double, Long, long,
Integer, int).
> It will add the input value and make the count + 1 each time.
>   *  public Double getLocalValue():
> To return the sum of value dividing count as average and the result will be "double".
>   *  public void resetLocal():
> To reset the value and count.
> It won`t be called automatically and it will be better to call this every time the getLocalValue()
method called.
>   *  public void merge(Accumulator<Double, Double> other):
> To merge another accumulator(only support AverageAccumulator).
>   *  public AverageAccumulator clone():
> To return the whole current AverageAccumulator class.

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