Package org.apache.accumulo.server.zookeeper

Class DistributedWorkQueue

java.lang.Object

org.apache.accumulo.server.zookeeper.DistributedWorkQueue

public class DistributedWorkQueue
extends Object

Provides a way to push work out to tablet servers via zookeeper and wait for that work to be done. Any tablet server can pick up a work item and process it. Worker processes watch a zookeeper node for tasks to be performed. After getting an exclusive lock on the node, the worker will perform the task.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	DistributedWorkQueue.Processor

Constructor Summary

Constructors

Constructor	Description
DistributedWorkQueue(String path, AccumuloConfiguration config)
DistributedWorkQueue(String path, AccumuloConfiguration config, long timerInitialDelay, long timerPeriod)

Method Summary

Modifier and Type	Method	Description
void	addWork(String workId, byte[] data)
void	addWork(String workId, String data)	Adds work to the queue, automatically converting the String to bytes using UTF-8
List<String>	getWorkQueued()
ZooReaderWriter	getZooReaderWriter()
void	startProcessing(DistributedWorkQueue.Processor processor, ThreadPoolExecutor executorService)
void	waitUntilDone(Set<String> workIDs)

Methods inherited from class java.lang.Object

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

Constructor Detail

DistributedWorkQueue

public DistributedWorkQueue(String path,
                            AccumuloConfiguration config)

DistributedWorkQueue

public DistributedWorkQueue(String path,
                            AccumuloConfiguration config,
                            long timerInitialDelay,
                            long timerPeriod)

Method Detail

getZooReaderWriter

public ZooReaderWriter getZooReaderWriter()

startProcessing

public void startProcessing(DistributedWorkQueue.Processor processor,
                            ThreadPoolExecutor executorService)
                     throws org.apache.zookeeper.KeeperException,
                            InterruptedException

Throws:

org.apache.zookeeper.KeeperException

InterruptedException

addWork

public void addWork(String workId,
                    String data)
             throws org.apache.zookeeper.KeeperException,
                    InterruptedException

Adds work to the queue, automatically converting the String to bytes using UTF-8

Throws:

org.apache.zookeeper.KeeperException

InterruptedException

addWork

public void addWork(String workId,
                    byte[] data)
             throws org.apache.zookeeper.KeeperException,
                    InterruptedException

Throws:

org.apache.zookeeper.KeeperException

InterruptedException

getWorkQueued

public List<String> getWorkQueued()
                           throws org.apache.zookeeper.KeeperException,
                                  InterruptedException

Throws:

org.apache.zookeeper.KeeperException

InterruptedException

waitUntilDone

public void waitUntilDone(Set<String> workIDs)
                   throws org.apache.zookeeper.KeeperException,
                          InterruptedException

Throws:

org.apache.zookeeper.KeeperException

InterruptedException