Package org.apache.hadoop.hdfs.server.namenode

Class NameNodeResourceChecker

java.lang.Object

org.apache.hadoop.hdfs.server.namenode.NameNodeResourceChecker

@Private
public class NameNodeResourceChecker
extends java.lang.Object

NameNodeResourceChecker provides a method - hasAvailableDiskSpace - which will return true if and only if the NameNode has disk space available on all required volumes, and any volume which is configured to be redundant. Volumes containing file system edits dirs are added by default, and arbitrary extra volumes may be configured as well.

Constructor Summary

Constructors

Constructor	Description
NameNodeResourceChecker(org.apache.hadoop.conf.Configuration conf)	Create a NameNodeResourceChecker, which will check the edits dirs and any additional dirs to check set in conf.

Method Summary

Modifier and Type	Method	Description
boolean	hasAvailableDiskSpace()	Return true if disk space is available on at least one of the configured redundant volumes, and all of the configured required volumes.

Methods inherited from class java.lang.Object

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

Constructor Detail

NameNodeResourceChecker

public NameNodeResourceChecker(org.apache.hadoop.conf.Configuration conf)
                        throws java.io.IOException

Create a NameNodeResourceChecker, which will check the edits dirs and any additional dirs to check set in conf.

Throws:

java.io.IOException

Method Detail

hasAvailableDiskSpace

public boolean hasAvailableDiskSpace()

Return true if disk space is available on at least one of the configured redundant volumes, and all of the configured required volumes.

Returns:

True if the configured amount of disk space is available on at least one redundant volume and all of the required volumes, false otherwise.