org.apache.hadoop.util
Class DiskChecker

java.lang.Object
  org.apache.hadoop.util.DiskChecker

public class DiskChecker
extends Object

Class that provides utility functions for checking disk problem

Nested Class Summary

static class	DiskChecker.DiskErrorException
static class	DiskChecker.DiskOutOfSpaceException

Constructor Summary

DiskChecker()

Method Summary

static void	checkDir(File dir)
static boolean	mkdirsWithExistsCheck(File dir) The semantics of mkdirsWithExistsCheck method is different from the mkdirs method provided in the Sun's java.io.File class in the following way: While creating the non-existent parent directories, this method checks for the existence of those directories if the mkdir fails at any point (since that directory might have just been created by some other process).

Methods inherited from class java.lang.Object

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

Constructor Detail

DiskChecker

public DiskChecker()

Method Detail

mkdirsWithExistsCheck

public static boolean mkdirsWithExistsCheck(File dir)

The semantics of mkdirsWithExistsCheck method is different from the mkdirs method provided in the Sun's java.io.File class in the following way: While creating the non-existent parent directories, this method checks for the existence of those directories if the mkdir fails at any point (since that directory might have just been created by some other process). If both mkdir() and the exists() check fails for any seemingly non-existent directory, then we signal an error; Sun's mkdir would signal an error (return false) if a directory it is attempting to create already exists or the mkdir fails.

Parameters:

dir -

Returns:

true on success, false on failure

checkDir

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

Throws:

DiskChecker.DiskErrorException