org.apache.hadoop.hdfs.server.common

Interface Storage.FormatConfirmable

All Known Subinterfaces:

JournalManager

All Known Implementing Classes:

BookKeeperJournalManager, FileJournalManager, JournalSet, QuorumJournalManager, Storage.StorageDirectory

Enclosing class:

Storage

@InterfaceAudience.Private
public static interface Storage.FormatConfirmable

Interface for classes which need to have the user confirm their formatting during NameNode -format and other similar operations. This is currently a storage directory or journal manager.

Method Summary

Methods

Modifier and Type	Method and Description
boolean	hasSomeData()
String	toString()

Method Detail

hasSomeData

boolean hasSomeData()
                    throws IOException

Returns:

true if the storage seems to have some valid data in it, and the user should be required to confirm the format. Otherwise, false.

Throws:

IOException - if the storage cannot be accessed at all.

toString

String toString()

Overrides:

toString in class Object

Returns:

a string representation of the formattable item, suitable for display to the user inside a prompt