org.calrissian.accumulorecipes.metricsstore.ext.stats.iterator

Class StatsCombiner

java.lang.Object

org.apache.accumulo.core.iterators.WrappingIterator

org.apache.accumulo.core.iterators.Combiner

org.calrissian.accumulorecipes.metricsstore.ext.stats.iterator.StatsCombiner

All Implemented Interfaces:

org.apache.accumulo.core.iterators.OptionDescriber, org.apache.accumulo.core.iterators.SortedKeyValueIterator<org.apache.accumulo.core.data.Key,org.apache.accumulo.core.data.Value>

public class StatsCombiner
extends org.apache.accumulo.core.iterators.Combiner

This combiner calculates the max, min, sum, count, and sumSquare of long integers represented as strings in values. It stores the result in a comma-separated value of the form max,min,sum,count,sumSquare. If such a value is encountered while combining, its information is incorporated into the running calculations of max, min, sum, ,count, and sumSquare. See Combiner for more information on which values are combined together.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.accumulo.core.iterators.Combiner

org.apache.accumulo.core.iterators.Combiner.ValueIterator

Nested classes/interfaces inherited from interface org.apache.accumulo.core.iterators.OptionDescriber

org.apache.accumulo.core.iterators.OptionDescriber.IteratorOptions

Field Summary

Fields inherited from class org.apache.accumulo.core.iterators.Combiner

ALL_OPTION, COLUMNS_OPTION

Constructor Summary

Constructors

Constructor and Description
StatsCombiner()

Method Summary

Methods

Modifier and Type	Method and Description
org.apache.accumulo.core.iterators.OptionDescriber.IteratorOptions	describeOptions()
org.apache.accumulo.core.data.Value	reduce(org.apache.accumulo.core.data.Key key, Iterator<org.apache.accumulo.core.data.Value> iter)

Methods inherited from class org.apache.accumulo.core.iterators.Combiner

deepCopy, getTopKey, getTopValue, hasTop, init, next, seek, setColumns, setCombineAllColumns, validateOptions

Methods inherited from class org.apache.accumulo.core.iterators.WrappingIterator

getSource, setSource

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

StatsCombiner

public StatsCombiner()

Method Detail

reduce

public org.apache.accumulo.core.data.Value reduce(org.apache.accumulo.core.data.Key key,
                                         Iterator<org.apache.accumulo.core.data.Value> iter)

Specified by:

reduce in class org.apache.accumulo.core.iterators.Combiner

describeOptions

public org.apache.accumulo.core.iterators.OptionDescriber.IteratorOptions describeOptions()

Specified by:

describeOptions in interface org.apache.accumulo.core.iterators.OptionDescriber

Overrides:

describeOptions in class org.apache.accumulo.core.iterators.Combiner