Package org.apache.hadoop.hdfs.server.common

Interface Storage.FormatConfirmable

All Known Subinterfaces:
JournalManager
All Known Implementing Classes:
FileJournalManager, JournalSet, QuorumJournalManager, Storage.StorageDirectory
Enclosing class:
Storage
@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

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

  • Method Details

    • 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