org.apache.hadoop.mapred

Interface MRConstants

@InterfaceAudience.Private
@InterfaceStability.Unstable
public interface MRConstants

Some handy constants

Field Summary

Fields

Modifier and Type	Field and Description
static String	APPLICATION_ATTEMPT_ID Used on by MRv2
static long	COUNTER_UPDATE_INTERVAL
static int	FILE_NOT_FOUND
static String	FOR_REDUCE_TASK The reduce task number for which this map output is being transferred
static String	FROM_MAP_TASK The map task from which the map output data is being transferred
static String	MAP_OUTPUT_LENGTH The custom http header used for the map output length.
static String	RAW_MAP_OUTPUT_LENGTH The custom http header used for the "raw" map output length.
static int	SUCCESS
static String	WORKDIR Used in MRv1, mostly in TaskTracker code

Field Detail

COUNTER_UPDATE_INTERVAL

static final long COUNTER_UPDATE_INTERVAL

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Constant Field Values

SUCCESS

static final int SUCCESS

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Constant Field Values

FILE_NOT_FOUND

static final int FILE_NOT_FOUND

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Constant Field Values

MAP_OUTPUT_LENGTH

static final String MAP_OUTPUT_LENGTH

The custom http header used for the map output length.

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Constant Field Values

RAW_MAP_OUTPUT_LENGTH

static final String RAW_MAP_OUTPUT_LENGTH

The custom http header used for the "raw" map output length.

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Constant Field Values

FROM_MAP_TASK

static final String FROM_MAP_TASK

The map task from which the map output data is being transferred

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Constant Field Values

FOR_REDUCE_TASK

static final String FOR_REDUCE_TASK

The reduce task number for which this map output is being transferred

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Constant Field Values

WORKDIR

static final String WORKDIR

Used in MRv1, mostly in TaskTracker code

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Constant Field Values

APPLICATION_ATTEMPT_ID

static final String APPLICATION_ATTEMPT_ID

Used on by MRv2

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Constant Field Values