Package org.apache.hadoop.fs.statistics

Interface IOStatistics

All Known Subinterfaces:
IOStatisticsSetters
All Known Implementing Classes:
IOStatisticsSnapshot
@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 Details

    • MIN_UNSET_VALUE

      static final long MIN_UNSET_VALUE
      Value when a minimum value has never been set.
      See Also:

    • MAX_UNSET_VALUE

      static final long MAX_UNSET_VALUE
      Value when a max value has never been set.
      See Also:

  • Method Details

    • 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.