cascading.tap.hadoop

Class Lfs

java.lang.Object

cascading.tap.Tap<Configuration,RecordReader,OutputCollector>

cascading.tap.hadoop.Hfs

cascading.tap.hadoop.Lfs

All Implemented Interfaces:

FlowElement, ScopedElement, FileType<Configuration>, TapWith<Configuration,RecordReader,OutputCollector>, Traceable, java.io.Serializable

public class Lfs
extends Hfs

Class Lfs is a Tap class that provides access to the Local File System via Hadoop.

Note that using a Lfs Tap instance in a Flow will force a portion of not the whole Flow to be executed in "local" mode forcing the Flow to execute in the current JVM. Mixing with Dfs and other Tap types is possible, providing a means to implement complex file/data management functions.

Use Hfs if you need a Tap instance that inherits the default FileSystem used by Hadoop.

See Also:

Serialized Form

Field Summary

Fields inherited from class cascading.tap.hadoop.Hfs

stringPath

Fields inherited from interface cascading.tap.type.FileType

CASCADING_SOURCE_PATH

Constructor Summary

Constructors

Constructor and Description
Lfs(Scheme scheme, java.lang.String stringPath) Constructor Lfs creates a new Lfs instance.
Lfs(Scheme scheme, java.lang.String stringPath, SinkMode sinkMode) Constructor Lfs creates a new Lfs instance.

Method Summary

Modifier and Type	Method and Description
protected FileSystem	getFileSystem(Configuration conf)
protected void	setStringPath(java.lang.String stringPath)

Methods inherited from class cascading.tap.hadoop.Hfs

applySourceConfInitIdentifiers, create, createResource, deleteChildResource, deleteChildResource, deleteResource, getBlockSize, getBlockSize, getChildIdentifiers, getChildIdentifiers, getChildIdentifiers, getChildIdentifiers, getCombinedInputSafeMode, getDefaultFileSystem, getDefaultFileSystemURIScheme, getFileStatus, getFullIdentifier, getIdentifier, getLocalModeScheme, getModifiedTime, getPath, getReplication, getReplication, getSize, getSize, getTempPath, getURIScheme, getUseCombinedInput, isDirectory, isDirectory, makeTemporaryPathDirString, makeURIScheme, openForRead, openForWrite, resetFileStatuses, resourceExists, setUriScheme, sinkConfInit, sourceConfInit, sourceConfInitAddInputPath, sourceConfInitAddInputPaths, sourceConfInitComplete, verifyNoDuplicates, withChildIdentifier, withScheme, withSinkMode

Methods inherited from class cascading.tap.Tap

commitResource, createResource, deleteResource, entryStream, entryStream, entryStreamCopy, entryStreamCopy, equals, flowConfInit, getConfigDef, getFullIdentifier, getModifiedTime, getNodeConfigDef, getScheme, getSinkFields, getSinkMode, getSourceFields, getStepConfigDef, getTrace, hasConfigDef, hashCode, hasNodeConfigDef, hasStepConfigDef, id, isKeep, isReplace, isSink, isSource, isTemporary, isUpdate, openForRead, openForReadUnchecked, openForWrite, outgoingScopeFor, prepareResourceForRead, prepareResourceForWrite, presentSinkFields, presentSourceFields, resolveIncomingOperationArgumentFields, resolveIncomingOperationPassThroughFields, resourceExists, retrieveSinkFields, retrieveSourceFields, rollbackResource, setScheme, spliterator, splititerator, taps, toString, tupleStream, tupleStream, tupleStreamCopy, tupleStreamCopy

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface cascading.tap.type.TapWith

asTap

Constructor Detail

Lfs

@ConstructorProperties(value={"scheme","stringPath"})
public Lfs(Scheme scheme,
                                                                 java.lang.String stringPath)

Constructor Lfs creates a new Lfs instance.

Parameters:

scheme - of type Scheme

stringPath - of type String

Lfs

@ConstructorProperties(value={"scheme","stringPath","sinkMode"})
public Lfs(Scheme scheme,
                                                                            java.lang.String stringPath,
                                                                            SinkMode sinkMode)

Constructor Lfs creates a new Lfs instance.

Parameters:

scheme - of type Scheme

stringPath - of type String

sinkMode - of type SinkMode

Method Detail

setStringPath

protected void setStringPath(java.lang.String stringPath)

Overrides:

setStringPath in class Hfs

getFileSystem

protected FileSystem getFileSystem(Configuration conf)

Overrides:

getFileSystem in class Hfs