Package org.apache.hadoop.util

Class DiskChecker

java.lang.Object

org.apache.hadoop.util.DiskChecker

@Private
@Unstable
public class DiskChecker
extends Object

Class that provides utility functions for checking disk problem

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	DiskChecker.DiskErrorException
static class	DiskChecker.DiskOutOfSpaceException

Field Summary

Fields

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

Constructor Summary

Constructors

Constructor	Description
DiskChecker()

Method Summary

Modifier and Type	Method	Description
static void	checkDir(File dir)	Create the directory if it doesn't exist and check that dir is readable, writable and executable
static void	checkDir(LocalFileSystem localFS, Path dir, FsPermission expected)	Create the local directory if necessary, check permissions and also ensure it can be read from and written into.
static void	checkDirWithDiskIo(File dir)	Create the directory if it doesn't exist and check that dir is readable, writable and executable.
static void	checkDirWithDiskIo(LocalFileSystem localFS, Path dir, FsPermission expected)	Create the local directory if necessary, also ensure permissions allow it to be read from and written into.

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

DiskChecker

public DiskChecker()

Method Details

checkDir

public static void checkDir(File dir)
                     throws DiskChecker.DiskErrorException

Create the directory if it doesn't exist and check that dir is readable, writable and executable

Parameters:

dir - dir.

Throws:

DiskChecker.DiskErrorException - disk problem.

checkDirWithDiskIo

public static void checkDirWithDiskIo(File dir)
                               throws DiskChecker.DiskErrorException

Create the directory if it doesn't exist and check that dir is readable, writable and executable. Perform some disk IO to ensure that the disk is usable for writes.

Parameters:

dir - dir.

Throws:

DiskChecker.DiskErrorException - disk problem.

checkDir

public static void checkDir(LocalFileSystem localFS,
 Path dir,
 FsPermission expected)
                     throws DiskChecker.DiskErrorException,
IOException

Create the local directory if necessary, check permissions and also ensure it can be read from and written into.

Parameters:

localFS - local filesystem

dir - directory

expected - permission

Throws:

DiskChecker.DiskErrorException - disk problem.

IOException - raised on errors performing I/O.

checkDirWithDiskIo

public static void checkDirWithDiskIo(LocalFileSystem localFS,
 Path dir,
 FsPermission expected)
                               throws DiskChecker.DiskErrorException,
IOException

Create the local directory if necessary, also ensure permissions allow it to be read from and written into. Perform some diskIO to ensure that the disk is usable for writes.

Parameters:

localFS - local filesystem

dir - directory

expected - permission

Throws:

DiskChecker.DiskErrorException - disk problem.

IOException - raised on errors performing I/O.