[jira] [Created] (FLINK-2626) Add a AverageAccumulator for FLINK-Accumulator

["Huang Wei (JIRA)" <ji...@apache.org>]

Huang Wei created FLINK-2626:
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             Summary: 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


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() called.

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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