Package org.apache.hadoop.fs.statistics

Interface IOStatistics

All Known Subinterfaces:

IOStatisticsSetters, IOStatisticsStore

All Known Implementing Classes:

AbstractIOStatisticsImpl, ForwardingIOStatisticsStore, IOStatisticsSnapshot, WrappedIOStatistics

@Public
@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	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	Description
java.util.Map<java.lang.String,java.lang.Long>	counters()	Map of counters.
java.util.Map<java.lang.String,java.lang.Long>	gauges()	Map of gauges.
java.util.Map<java.lang.String,java.lang.Long>	maximums()	Map of maximums.
java.util.Map<java.lang.String,MeanStatistic>	meanStatistics()	Map of meanStatistics.
java.util.Map<java.lang.String,java.lang.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

java.util.Map<java.lang.String,java.lang.Long> counters()

Map of counters.

Returns:

the current map of counters.

gauges

java.util.Map<java.lang.String,java.lang.Long> gauges()

Map of gauges.

Returns:

the current map of gauges.

minimums

java.util.Map<java.lang.String,java.lang.Long> minimums()

Map of minimums.

Returns:

the current map of minimums.

maximums

java.util.Map<java.lang.String,java.lang.Long> maximums()

Map of maximums.

Returns:

the current map of maximums.

meanStatistics

java.util.Map<java.lang.String,MeanStatistic> meanStatistics()

Map of meanStatistics.

Returns:

the current map of MeanStatistic statistics.