org.apache.hadoop.mapred
Class JobHistory.MapAttempt

java.lang.Object
  org.apache.hadoop.mapred.JobHistory.Task
      org.apache.hadoop.mapred.JobHistory.TaskAttempt
          org.apache.hadoop.mapred.JobHistory.MapAttempt

Enclosing class:

JobHistory

public static class JobHistory.MapAttempt
extends JobHistory.TaskAttempt

Helper class for logging or reading back events related to start, finish or failure of a Map Attempt on a node.

Constructor Summary

JobHistory.MapAttempt()

Method Summary

String	get(JobHistory.Keys k) Get 'String' value for given key.
int	getInt(JobHistory.Keys k) Convert value from history to int and return.
long	getLong(JobHistory.Keys k) Convert value from history to int and return.
Map<JobHistory.Keys,String>	getValues() Returns Map containing all key-values.
void	handle(Map<JobHistory.Keys,String> values) Reads values back from the history, input is same Map as passed to Listener by parseHistory().
static void	logFailed(String jobId, String taskId, String taskAttemptId, long timestamp, String hostName, String error) Log task attempt failed event.
static void	logFinished(String jobId, String taskId, String taskAttemptId, long finishTime, String hostName) Log finish time of map task attempt.
static void	logStarted(String jobId, String taskId, String taskAttemptId, long startTime, String hostName) Log start time of this map task attempt.
void	set(JobHistory.Keys k, String s) Set value for the key.
void	set(Map<JobHistory.Keys,String> m) Adds all values in the Map argument to its own values.

Methods inherited from class org.apache.hadoop.mapred.JobHistory.Task

getTaskAttempts, logFailed, logFinished, logStarted

Methods inherited from class java.lang.Object

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

Constructor Detail

JobHistory.MapAttempt

public JobHistory.MapAttempt()

Method Detail

logStarted

public static void logStarted(String jobId,
                              String taskId,
                              String taskAttemptId,
                              long startTime,
                              String hostName)

Log start time of this map task attempt.

Parameters:

jobId - job id

taskId - task id

taskAttemptId - task attempt id

startTime - start time of task attempt as reported by task tracker.

hostName - host name of the task attempt.

logFinished

public static void logFinished(String jobId,
                               String taskId,
                               String taskAttemptId,
                               long finishTime,
                               String hostName)

Log finish time of map task attempt.

Parameters:

jobId - job id

taskId - task id

taskAttemptId - task attempt id

finishTime - finish time

hostName - host name

logFailed

public static void logFailed(String jobId,
                             String taskId,
                             String taskAttemptId,
                             long timestamp,
                             String hostName,
                             String error)

Log task attempt failed event.

Parameters:

jobId - jobid

taskId - taskid

taskAttemptId - task attempt id

timestamp - timestamp

hostName - hostname of this task attempt.

error - error message if any for this task attempt.

get

public String get(JobHistory.Keys k)

Get 'String' value for given key. Most of the places use Strings as values so the default get' method returns 'String'. This method never returns null to ease on GUIs. if no value is found it returns empty string ""

Parameters:

k -

Returns:

if null it returns empty string - ""

getInt

public int getInt(JobHistory.Keys k)

Convert value from history to int and return. if no value is found it returns 0.

Parameters:

k - key

getLong

public long getLong(JobHistory.Keys k)

Convert value from history to int and return. if no value is found it returns 0.

Parameters:

k -

set

public void set(JobHistory.Keys k,
                String s)

Set value for the key.

Parameters:

k -

s -

set

public void set(Map<JobHistory.Keys,String> m)

Adds all values in the Map argument to its own values.

Parameters:

m -

handle

public void handle(Map<JobHistory.Keys,String> values)

Reads values back from the history, input is same Map as passed to Listener by parseHistory().

Parameters:

values -

getValues

public Map<JobHistory.Keys,String> getValues()

Returns Map containing all key-values.