org.apache.giraph.master

Class MasterThread<I extends org.apache.hadoop.io.WritableComparable,V extends org.apache.hadoop.io.Writable,E extends org.apache.hadoop.io.Writable>

java.lang.Object

java.lang.Thread

org.apache.giraph.master.MasterThread<I,V,E>

Type Parameters:

I - Vertex id

V - Vertex value

E - Edge value

All Implemented Interfaces:

Runnable

public class MasterThread<I extends org.apache.hadoop.io.WritableComparable,V extends org.apache.hadoop.io.Writable,E extends org.apache.hadoop.io.Writable>
extends Thread

Master thread that will coordinate the activities of the tasks. It runs on all task processes, however, will only execute its algorithm if it knows it is the "leader" from ZooKeeper.

Nested Class Summary

Nested classes/interfaces inherited from class java.lang.Thread

Thread.State, Thread.UncaughtExceptionHandler

Field Summary

Fields

Modifier and Type	Field and Description
static String	GIRAPH_TIMERS_COUNTER_GROUP_NAME Counter group name for the Giraph timers

Fields inherited from class java.lang.Thread

MAX_PRIORITY, MIN_PRIORITY, NORM_PRIORITY

Constructor Summary

Constructors

Constructor and Description
MasterThread(CentralizedServiceMaster<I,V,E> bspServiceMaster, org.apache.hadoop.mapreduce.Mapper.Context context) Constructor.

Method Summary

Modifier and Type	Method and Description
void	run() The master algorithm.

Methods inherited from class java.lang.Thread

activeCount, checkAccess, clone, countStackFrames, currentThread, destroy, dumpStack, enumerate, getAllStackTraces, getContextClassLoader, getDefaultUncaughtExceptionHandler, getId, getName, getPriority, getStackTrace, getState, getThreadGroup, getUncaughtExceptionHandler, holdsLock, interrupt, interrupted, isAlive, isDaemon, isInterrupted, join, join, join, resume, setContextClassLoader, setDaemon, setDefaultUncaughtExceptionHandler, setName, setPriority, setUncaughtExceptionHandler, sleep, sleep, start, stop, stop, suspend, toString, yield

Methods inherited from class java.lang.Object

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

Field Detail

GIRAPH_TIMERS_COUNTER_GROUP_NAME

public static final String GIRAPH_TIMERS_COUNTER_GROUP_NAME

Counter group name for the Giraph timers

See Also:

Constant Field Values

Constructor Detail

MasterThread

public MasterThread(CentralizedServiceMaster<I,V,E> bspServiceMaster,
                    org.apache.hadoop.mapreduce.Mapper.Context context)

Constructor.

Parameters:

bspServiceMaster - Master that already exists and setup() has been called.

context - Context from the Mapper.

Method Detail

run

public void run()

The master algorithm. The algorithm should be able to withstand failures and resume as necessary since the master may switch during a job.

Specified by:

run in interface Runnable

Overrides:

run in class Thread