org.apache.hadoop.fs.s3a.prefetch

Class PrefetchingInputStreamFactory

java.lang.Object

org.apache.hadoop.service.AbstractService

org.apache.hadoop.fs.s3a.impl.streams.AbstractObjectInputStreamFactory

org.apache.hadoop.fs.s3a.prefetch.PrefetchingInputStreamFactory

All Implemented Interfaces:

Closeable, AutoCloseable, ObjectInputStreamFactory, org.apache.hadoop.fs.StreamCapabilities, org.apache.hadoop.service.Service

public class PrefetchingInputStreamFactory
extends AbstractObjectInputStreamFactory

Factory for prefetching streams.

Reads and validates prefetch configuration options during service init.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.hadoop.fs.s3a.impl.streams.ObjectInputStreamFactory

ObjectInputStreamFactory.StreamFactoryCallbacks

Nested classes/interfaces inherited from interface org.apache.hadoop.service.Service

org.apache.hadoop.service.Service.STATE

Nested classes/interfaces inherited from interface org.apache.hadoop.fs.StreamCapabilities

org.apache.hadoop.fs.StreamCapabilities.StreamCapability

Field Summary

Fields inherited from interface org.apache.hadoop.fs.StreamCapabilities

ABORTABLE_STREAM, DROPBEHIND, HFLUSH, HSYNC, IOSTATISTICS, IOSTATISTICS_CONTEXT, PREADBYTEBUFFER, READAHEAD, READBYTEBUFFER, UNBUFFER, VECTOREDIO, VECTOREDIO_BUFFERS_SLICED

Constructor Summary

Constructors

Constructor and Description
PrefetchingInputStreamFactory()

Method Summary

Modifier and Type	Method and Description
StreamFactoryRequirements	factoryRequirements() Calculate Return StreamFactoryRequirements.
ObjectInputStream	readObject(ObjectReadParameters parameters) Create a new input stream.
protected void	serviceInit(org.apache.hadoop.conf.Configuration conf)
InputStreamType	streamType() Get the input stream type.

Methods inherited from class org.apache.hadoop.fs.s3a.impl.streams.AbstractObjectInputStreamFactory

bind, callbacks, hasCapability

Methods inherited from class org.apache.hadoop.service.AbstractService

close, getBlockers, getConfig, getFailureCause, getFailureState, getLifecycleHistory, getName, getServiceState, getStartTime, init, isInState, noteFailure, putBlocker, registerGlobalListener, registerServiceListener, removeBlocker, serviceStart, serviceStop, setConfig, start, stop, toString, unregisterGlobalListener, unregisterServiceListener, waitForServiceToStop

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.hadoop.service.Service

close, getBlockers, getConfig, getFailureCause, getFailureState, getLifecycleHistory, getName, getServiceState, getStartTime, init, isInState, registerServiceListener, start, stop, unregisterServiceListener, waitForServiceToStop

Constructor Detail

PrefetchingInputStreamFactory

public PrefetchingInputStreamFactory()

Method Detail

streamType

public InputStreamType streamType()

Description copied from interface: ObjectInputStreamFactory

Get the input stream type.

Returns:

the specific stream type this factory produces.

serviceInit

protected void serviceInit(org.apache.hadoop.conf.Configuration conf)
                    throws Exception

Overrides:

serviceInit in class org.apache.hadoop.service.AbstractService

Throws:

Exception

readObject

public ObjectInputStream readObject(ObjectReadParameters parameters)
                             throws IOException

Description copied from interface: ObjectInputStreamFactory

Create a new input stream. There is no requirement to actually contact the store; this is generally done lazily.

Parameters:

parameters - parameters.

Returns:

the input stream

Throws:

IOException - problem creating the stream.

factoryRequirements

public StreamFactoryRequirements factoryRequirements()

Calculate Return StreamFactoryRequirements.

Returns:

thread count a vector minimum seek of 0.