Package org.apache.hadoop.hdfs

Class ReadStatistics

java.lang.Object
org.apache.hadoop.hdfs.ReadStatistics
public class ReadStatistics extends Object
A utility class that maintains statistics for reading.

  • Constructor Details

    • ReadStatistics

      public ReadStatistics()

    • ReadStatistics

      public ReadStatistics(ReadStatistics rhs)

  • Method Details

    • getTotalBytesRead

      public long getTotalBytesRead()
      Returns:
      The total bytes read. This will always be at least as high as the other numbers, since it includes all of them.

    • getTotalLocalBytesRead

      public long getTotalLocalBytesRead()
      Returns:
      The total local bytes read. This will always be at least as high as totalShortCircuitBytesRead, since all short-circuit reads are also local.

    • getTotalShortCircuitBytesRead

      public long getTotalShortCircuitBytesRead()
      Returns:
      The total short-circuit local bytes read.

    • getTotalZeroCopyBytesRead

      public long getTotalZeroCopyBytesRead()
      Returns:
      The total number of zero-copy bytes read.

    • getRemoteBytesRead

      public long getRemoteBytesRead()
      Returns:
      The total number of bytes read which were not local.

    • getBlockType

      public BlockType getBlockType()
      Returns:
      block type of the input stream. If block type != CONTIGUOUS, it is reading erasure coded data.

    • getTotalEcDecodingTimeMillis

      public long getTotalEcDecodingTimeMillis()
      Return the total time in milliseconds used for erasure coding decoding.

    • addRemoteBytes

      public void addRemoteBytes(long amt)

    • addLocalBytes

      public void addLocalBytes(long amt)

    • addShortCircuitBytes

      public void addShortCircuitBytes(long amt)

    • addZeroCopyBytes

      public void addZeroCopyBytes(long amt)

    • addErasureCodingDecodingTime

      public void addErasureCodingDecodingTime(long millis)

    • clear

      public void clear()