org.apache.hadoop.contrib.failmon

Class HadoopLogParser

java.lang.Object

org.apache.hadoop.contrib.failmon.LogParser

org.apache.hadoop.contrib.failmon.HadoopLogParser

All Implemented Interfaces:

Monitored

public class HadoopLogParser
extends LogParser

An object of this class parses a Hadoop log file to create appropriate EventRecords. The log file can either be the log of a NameNode or JobTracker or DataNode or TaskTracker.

Constructor Summary

Constructors

Constructor and Description
HadoopLogParser(String fname) Create a new parser object and try to find the hostname of the node that generated the log

Method Summary

Methods

Modifier and Type	Method and Description
String	getInfo() Return a String with information about this class
protected Calendar	parseDate(String strDate, String strTime) Parse a date found in the Hadoop log.
EventRecord	parseLine(String line) Parses one line of the log.

Methods inherited from class org.apache.hadoop.contrib.failmon.LogParser

checkForRotation, getNext, getReader, monitor, monitor, setNetworkProperties

Methods inherited from class java.lang.Object

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

Constructor Detail

HadoopLogParser

public HadoopLogParser(String fname)

Create a new parser object and try to find the hostname of the node that generated the log

Method Detail

parseLine

public EventRecord parseLine(String line)
                      throws IOException

Parses one line of the log. If the line contains a valid log entry, then an appropriate EventRecord is returned, after all relevant fields have been parsed.

Specified by:

parseLine in class LogParser

Parameters:

line - the log line to be parsed

Returns:

the EventRecord representing the log entry of the line. If the line does not contain a valid log entry, then the EventRecord returned has isValid() = false. When the end-of-file has been reached, null is returned to the caller.

Throws:

IOException

parseDate

protected Calendar parseDate(String strDate,
                 String strTime)

Parse a date found in the Hadoop log.

Specified by:

parseDate in class LogParser

Returns:

a Calendar representing the date

getInfo

public String getInfo()

Return a String with information about this class

Returns:

A String describing this class