org.apache.hadoop.fs.statistics

Interface IOStatistics

All Known Subinterfaces:

IOStatisticsSetters

All Known Implementing Classes:

IOStatisticsSnapshot

@InterfaceAudience.Public
 @InterfaceStability.Unstable
public interface IOStatistics

IO Statistics.

These are low-cost per-instance statistics provided by any Hadoop I/O class instance.

Consult the filesystem specification document for the requirements of an implementation of this interface.

Field Summary

Fields

Modifier and Type	Field and Description
static long	MAX_UNSET_VALUE Value when a max value has never been set.
static long	MIN_UNSET_VALUE Value when a minimum value has never been set.

Method Summary

Modifier and Type	Method and Description
Map<String,Long>	counters() Map of counters.
Map<String,Long>	gauges() Map of gauges.
Map<String,Long>	maximums() Map of maximums.
Map<String,MeanStatistic>	meanStatistics() Map of meanStatistics.
Map<String,Long>	minimums() Map of minimums.

Field Detail

MIN_UNSET_VALUE

static final long MIN_UNSET_VALUE

Value when a minimum value has never been set.

See Also:

Constant Field Values

MAX_UNSET_VALUE

static final long MAX_UNSET_VALUE

Value when a max value has never been set.

See Also:

Constant Field Values

Method Detail

counters

Map<String,Long> counters()

Map of counters.

Returns:

the current map of counters.

gauges

Map<String,Long> gauges()

Map of gauges.

Returns:

the current map of gauges.

minimums

Map<String,Long> minimums()

Map of minimums.

Returns:

the current map of minimums.

maximums

Map<String,Long> maximums()

Map of maximums.

Returns:

the current map of maximums.

meanStatistics

Map<String,MeanStatistic> meanStatistics()

Map of meanStatistics.

Returns:

the current map of MeanStatistic statistics.