Package org.apache.hadoop.hdfs.tools.offlineEditsViewer

Interface OfflineEditsVisitor

All Known Implementing Classes:
BinaryEditsVisitor, StatisticsEditsVisitor, XmlEditsVisitor
@Private @Unstable public interface OfflineEditsVisitor
An implementation of OfflineEditsVisitor can traverse the structure of an Hadoop edits log and respond to each of the structures within the file.

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    close(Throwable error)
    Finish visiting the edits log structure.
    void
    start(int version)
    Begin visiting the edits log structure.
    void
    visitOp(FSEditLogOp op)
    Begin visiting an element that encloses another element, such as the beginning of the list of blocks that comprise a file.

  • Method Details

    • start

      void start(int version) throws IOException
      Begin visiting the edits log structure. Opportunity to perform any initialization necessary for the implementing visitor.
      Parameters:
      version - Edit log version
      Throws:
      IOException

    • close

      void close(Throwable error) throws IOException
      Finish visiting the edits log structure. Opportunity to perform any clean up necessary for the implementing visitor.
      Parameters:
      error - If the visitor was closed because of an unrecoverable error in the input stream, this is the exception.
      Throws:
      IOException

    • visitOp

      void visitOp(FSEditLogOp op) throws IOException
      Begin visiting an element that encloses another element, such as the beginning of the list of blocks that comprise a file.
      Parameters:
      op - Token being visited
      Throws:
      IOException