org.apache.hadoop.fs

类 InMemoryFileSystem

java.lang.Object

org.apache.hadoop.conf.Configured

org.apache.hadoop.fs.FileSystem

org.apache.hadoop.fs.FilterFileSystem

org.apache.hadoop.fs.ChecksumFileSystem

org.apache.hadoop.fs.InMemoryFileSystem

所有已实现的接口:

Closeable, AutoCloseable, Configurable

已过时。

@Deprecated
public class InMemoryFileSystem
extends ChecksumFileSystem

An implementation of the in-memory filesystem. This implementation assumes that the file lengths are known ahead of time and the total lengths of all the files is below a certain number (like 100 MB, configurable). Use the API reserveSpaceWithCheckSum(Path f, int size) (see below for a description of the API for reserving space in the FS. The uri of this filesystem starts with ramfs:// .

嵌套类概要

从类继承的嵌套类/接口 org.apache.hadoop.fs.FileSystem

FileSystem.Statistics

字段概要

从类继承的字段 org.apache.hadoop.fs.FilterFileSystem

fs

从类继承的字段 org.apache.hadoop.fs.FileSystem

FS_DEFAULT_NAME_KEY, LOG, statistics

构造器概要

构造器

构造器和说明
InMemoryFileSystem() 已过时。
InMemoryFileSystem(URI uri, Configuration conf) 已过时。

方法概要

方法

限定符和类型	方法和说明
Path[]	getFiles(PathFilter filter) 已过时。
long	getFSSize() 已过时。
int	getNumFiles(PathFilter filter) 已过时。
float	getPercentUsed() 已过时。
boolean	reserveSpaceWithCheckSum(Path f, long size) 已过时。 Register a file with its size.

从类继承的方法 org.apache.hadoop.fs.ChecksumFileSystem

append, completeLocalOutput, copyFromLocalFile, copyToLocalFile, copyToLocalFile, create, createNonRecursive, delete, getApproxChkSumLength, getBytesPerSum, getChecksumFile, getChecksumFileLength, getChecksumLength, getRawFileSystem, isChecksumFile, listStatus, mkdirs, open, rename, reportChecksumFailure, setConf, setReplication, setVerifyChecksum, startLocalOutput

从类继承的方法 org.apache.hadoop.fs.FilterFileSystem

checkPath, close, concat, delete, getCanonicalServiceName, getConf, getDefaultBlockSize, getDefaultReplication, getFileBlockLocations, getFileChecksum, getFileStatus, getHomeDirectory, getName, getUri, getWorkingDirectory, initialize, makeQualified, mkdirs, setOwner, setPermission, setWorkingDirectory

从类继承的方法 org.apache.hadoop.fs.FileSystem

addFileSystemForTesting, append, append, clearStatistics, closeAll, closeAllForUGI, copyFromLocalFile, copyFromLocalFile, copyFromLocalFile, copyToLocalFile, create, create, create, create, create, create, create, create, create, create, createNewFile, createNonRecursive, deleteOnExit, exists, get, get, get, getAllStatistics, getBlockSize, getCacheSize, getCanonicalUri, getContentSummary, getDefaultBlockSize, getDefaultPort, getDefaultReplication, getDefaultUri, getDelegationToken, getLength, getLocal, getNamed, getReplication, getStatistics, getStatistics, getUsed, globStatus, globStatus, isDirectory, isFile, listStatus, listStatus, listStatus, mkdirs, moveFromLocalFile, moveFromLocalFile, moveToLocalFile, open, printStatistics, processDeleteOnExit, setDefaultUri, setDefaultUri, setTimes

从类继承的方法 java.lang.Object

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

构造器详细资料

InMemoryFileSystem

public InMemoryFileSystem()

已过时。

InMemoryFileSystem

public InMemoryFileSystem(URI uri,
                  Configuration conf)

已过时。

方法详细资料

reserveSpaceWithCheckSum

public boolean reserveSpaceWithCheckSum(Path f,
                               long size)

已过时。

Register a file with its size. This will also register a checksum for the file that the user is trying to create. This is required since none of the FileSystem APIs accept the size of the file as argument. But since it is required for us to apriori know the size of the file we are going to create, the user must call this method for each file he wants to create and reserve memory for that file. We either succeed in reserving memory for both the main file and the checksum file and return true, or return false.

getFiles

public Path[] getFiles(PathFilter filter)

已过时。

getNumFiles

public int getNumFiles(PathFilter filter)

已过时。

getFSSize

public long getFSSize()

已过时。

getPercentUsed

public float getPercentUsed()

已过时。