org.apache.hadoop.fs.statistics

Interface IOStatisticsSource

All Known Subinterfaces:

MultipartUploader

All Known Implementing Classes:

AbstractMultipartUploader, BlockCompressorStream, BlockDecompressorStream, BufferedIOStatisticsInputStream, BufferedIOStatisticsOutputStream, CompressionInputStream, CompressionOutputStream, CompressorStream, CryptoFSDataInputStream, CryptoFSDataOutputStream, DecompressorStream, FSDataInputStream, FSDataOutputStream, GzipCodec.GzipOutputStream, PassthroughCodec.PassthroughDecompressorStream, SourceWrappedStatistics, SplitCompressionInputStream

@InterfaceStability.Unstable
public interface IOStatisticsSource

A source of IO statistics.

These statistics MUST be instance specific, not thread local.

Method Summary

Modifier and Type	Method and Description
default IOStatistics	getIOStatistics() Return a statistics instance.

Method Detail

getIOStatistics

default IOStatistics getIOStatistics()

Return a statistics instance.

It is not a requirement that the same instance is returned every time. IOStatisticsSource.

If the object implementing this is Closeable, this method may return null if invoked on a closed object, even if it returns a valid instance when called earlier.

Returns:

an IOStatistics instance or null