Example usage for org.apache.hadoop.mapreduce Reducer subclass-usage

Introduction

In this page you can find the example usage for org.apache.hadoop.mapreduce Reducer subclass-usage.

Usage

From source file gaffer.accumulo.bulkimport.BulkImportReducer.java

/**
 * Reducer for use in bulk import of data into Accumulo. It merges all values associated
 * to the key by converting them into {@link SetOfStatistics} and then merges
 * those, and then converts them back to an Accumulo value.
 * 
 * It contains an optimisation so that if there is only one value, we simply

From source file gaffer.accumulo.splitpoints.EstimateSplitPointsReducer.java

/**
 * Reducer class used for estimating the split points to ensure even distribution of
 * data in Accumulo after initial insert.
 */
public class EstimateSplitPointsReducer extends Reducer<Key, Value, Key, Value> {

From source file gaffer.accumulostore.operation.hdfs.handler.job.AccumuloKeyValueReducer.java

/**
 * Reducer for use in bulk import of data into Accumulo. It merges all values
 * associated to the gaffer.accumulostore.key by converting them into
 * {@link gaffer.data.element.Properties} and then merges those, and then
 * converts them back to an Accumulo value.
 * <p>

From source file gaffer.accumulostore.operation.hdfs.handler.job.AddElementsFromHdfsReducer.java

/**
 * Reducer for use in bulk import of data into Accumulo. It merges all values
 * associated to the gaffer.accumulostore.key by converting them into
 * {@link gaffer.data.element.Properties} and then merges those, and then
 * converts them back to an Accumulo value.
 * <p>

From source file gaffer.accumulostore.operation.hdfs.reducer.AccumuloKeyValueReducer.java

/**
 * Reducer for use in bulk import of data into Accumulo. It merges all values
 * associated to the gaffer.accumulostore.key by converting them into
 * {@link gaffer.data.element.Properties} and then merges those, and then
 * converts them back to an Accumulo value.
 * <p>

From source file gaffer.analytic.impl.GraphStatisticsReducer.java

/**
 * Simply merges together all the {@link SetOfStatistics} for the key.
 */
public class GraphStatisticsReducer extends Reducer<Text, SetOfStatistics, Text, SetOfStatistics> {

    protected void reduce(Text key, Iterable<SetOfStatistics> values, Context context)

From source file gobblin.compaction.mapreduce.avro.AvroKeyDedupReducer.java

/**
 * Reducer class for compaction MR job for Avro data.
 *
 * If there are multiple values of the same key, it keeps the last value read.
 *
 * @author Ziyang Liu

From source file gov.jgi.meta.hadoop.reduce.AssembleByGroupKey.java

/**
 * simple reducer that just outputs the matches grouped by gene
 */
public class AssembleByGroupKey extends Reducer<Text, Text, Text, Text> {
    private IntWritable result = new IntWritable();

From source file gov.jgi.meta.hadoop.reduce.IdentityReducerGroupByKey.java

/**
 * simple reducer that just outputs the matches grouped by gene
 */
public class IdentityReducerGroupByKey extends Reducer<Text, Text, Text, Text> {
    public void reduce(Text key, Iterable<Text> values, Context context) throws InterruptedException, IOException {
        StringBuilder sb = new StringBuilder();

From source file gov.llnl.ontology.mapreduce.stats.WordCountSumReducer.java

/**
 * @author Keith Stevens
 */
public class WordCountSumReducer extends Reducer<StringPair, IntWritable, StringPair, IntWritable> {

    /**