Package org.apache.hadoop.hdfs.client.impl.metrics

Class BlockReaderIoProvider

java.lang.Object

org.apache.hadoop.hdfs.client.impl.metrics.BlockReaderIoProvider

public class BlockReaderIoProvider
extends Object

Profiles BlockReaderLocal short circuit read latencies when ShortCircuit read metrics is enabled through DfsClientConf.ShortCircuitConf.scrMetricsEnabled.

Field Summary

Fields

Modifier and Type	Field	Description
static final org.slf4j.Logger	LOG

Constructor Summary

Constructors

Constructor	Description
BlockReaderIoProvider(DfsClientConf.ShortCircuitConf conf, BlockReaderLocalMetrics metrics, org.apache.hadoop.util.Timer timer)

Method Summary

Modifier and Type	Method	Description
int	read(FileChannel dataIn, ByteBuffer dst, long position)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

LOG

public static final org.slf4j.Logger LOG

Constructor Details

BlockReaderIoProvider

public BlockReaderIoProvider(@Nullable
 DfsClientConf.ShortCircuitConf conf,
 BlockReaderLocalMetrics metrics,
 org.apache.hadoop.util.Timer timer)

Method Details

read

public int read(FileChannel dataIn,
 ByteBuffer dst,
 long position)
         throws IOException

Throws:

IOException