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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