MapReduce Options

COMBINE=class-name

specifies the name of the combiner class in dot notation.

DELETERESULTS

deletes the MapReduce results.

GROUPCOMPARE=class-name

specifies the name of the grouping comparator (GroupComparator) class in dot notation.

INPUT=HDFS-path

specifies the HDFS path to the MapReduce input file.

INPUTFORMAT=class-name

specifies the name of the input format class in dot notation.

JAR='external-file(s)'

specifies the locations of the JAR files that contain the MapReduce program and named classes. Include the complete pathname and the filename. Enclose each location in single or double quotation marks.

MAP=class-name

specifies the name of the map class in dot notation. A map class contains elements that are formed by the combination of a key value and a mapped value.

OUTPUT=HDFS-path

specifies a new HDFS path for the MapReduce output.

OUTPUTFORMAT=class-name

specifies the name of the output format class in dot notation.

OUTPUTKEY=class-name

specifies the name of the output key class in dot notation.

OUTPUTVALUE=class-name

is the name of the output value class in dot notation.

PARTITIONER=class-name

specifies the name of the partitioner class in dot notation. A partitioner class controls the partitioning of the keys of the intermediate map-outputs.

REDUCE=class-name

specifies the name of the reducer class in dot notation. The reduce class reduces a set of intermediate values that share a key to a smaller set of values.

REDUCETASKS=integer

specifies the number of reduce tasks.

SORTCOMPARE=class-name

specifies the name of the sort comparator class in dot notation.

WORKINGDIR=HDFS-path

specifies the name of the HDFS working directory path.