org.apache.hadoop.hdfs.server.namenode

Class FSEditLogOp.Reader

java.lang.Object

org.apache.hadoop.hdfs.server.namenode.FSEditLogOp.Reader

Enclosing class:

org.apache.hadoop.hdfs.server.namenode.FSEditLogOp

public static class FSEditLogOp.Reader
extends Object

Class for reading editlog ops from a stream

Constructor Summary

Constructors

Constructor and Description
FSEditLogOp.Reader(DataInputStream in, int logVersion) Construct the reader

Method Summary

Methods

Modifier and Type	Method and Description
org.apache.hadoop.hdfs.server.namenode.FSEditLogOp	readOp() Read an operation from the input stream.

Methods inherited from class java.lang.Object

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

Constructor Detail

FSEditLogOp.Reader

public FSEditLogOp.Reader(DataInputStream in,
                  int logVersion)

Construct the reader

Parameters:

in - The stream to read from.

logVersion - The version of the data coming from the stream.

Method Detail

readOp

public org.apache.hadoop.hdfs.server.namenode.FSEditLogOp readOp()
                                                          throws IOException

Read an operation from the input stream. Note that the objects returned from this method may be re-used by future calls to the same method.

Returns:

the operation read from the stream, or null at the end of the file

Throws:

IOException - on error.