Package org.apache.hadoop.hdfs.server.datanode.checker

Interface Checkable<K,V>

All Known Subinterfaces:

FsVolumeSpi

All Known Implementing Classes:

FsVolumeImpl, StorageLocation

@Private
@Unstable
public interface Checkable<K,V>

A Checkable is an object whose health can be probed by invoking its check(K) method. e.g. a Checkable instance may represent a single hardware resource.

Method Summary

Modifier and Type	Method	Description
V	check(K context)	Query the health of this object.

Method Detail

check

V check(K context)
 throws java.lang.Exception

Query the health of this object. This method may hang indefinitely depending on the status of the target resource.

Parameters:

context - for the probe operation. May be null depending on the implementation.

Returns:

result of the check operation.

Throws:

java.lang.Exception - encountered during the check operation. An exception indicates that the check failed.