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

Class StatisticsEditsVisitor

java.lang.Object

org.apache.hadoop.hdfs.tools.offlineEditsViewer.StatisticsEditsVisitor

All Implemented Interfaces:

OfflineEditsVisitor

@Private
@Unstable
public class StatisticsEditsVisitor
extends Object
implements OfflineEditsVisitor

StatisticsEditsVisitor implements text version of EditsVisitor that aggregates counts of op codes processed

Constructor Summary

Constructors

Constructor	Description
StatisticsEditsVisitor(OutputStream out)	Create a processor that writes to the file named and may or may not also output to the screen, as specified.

Method Summary

Modifier and Type	Method	Description
void	close(Throwable error)	Close the visitor
Map<FSEditLogOpCodes,Long>	getStatistics()	Get statistics
String	getStatisticsString()	Get the statistics in string format, suitable for printing
void	start(int version)	Start the visitor
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.

Methods inherited from class java.lang.Object

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

Constructor Details

StatisticsEditsVisitor

public StatisticsEditsVisitor(OutputStream out)
                       throws IOException

Create a processor that writes to the file named and may or may not also output to the screen, as specified.

Parameters:

out - Name of file to write output to

Throws:

IOException

Method Details

start

public void start(int version)
           throws IOException

Start the visitor

Specified by:

start in interface OfflineEditsVisitor

Parameters:

version - Edit log version

Throws:

IOException

close

public void close(Throwable error)
           throws IOException

Close the visitor

Specified by:

close in interface OfflineEditsVisitor

Parameters:

error - If the visitor was closed because of an unrecoverable error in the input stream, this is the exception.

Throws:

IOException

visitOp

public void visitOp(FSEditLogOp op)
             throws IOException

Description copied from interface: OfflineEditsVisitor

Begin visiting an element that encloses another element, such as the beginning of the list of blocks that comprise a file.

Specified by:

visitOp in interface OfflineEditsVisitor

Parameters:

op - Token being visited

Throws:

IOException

getStatistics

public Map<FSEditLogOpCodes,Long> getStatistics()

Get statistics

Returns:

statistics, map of counts per opCode

getStatisticsString

public String getStatisticsString()

Get the statistics in string format, suitable for printing

Returns:

statistics in in string format, suitable for printing