Package org.apache.flink.runtime.jobmanager

Class ZooKeeperExecutionPlanStoreWatcher

java.lang.Object

org.apache.flink.runtime.jobmanager.ZooKeeperExecutionPlanStoreWatcher

All Implemented Interfaces:

ExecutionPlanStoreWatcher

public class ZooKeeperExecutionPlanStoreWatcher
extends Object
implements ExecutionPlanStoreWatcher

ExecutionPlanStoreWatcher implementation for ZooKeeper.

Each job graph creates ZNode:

 +----O /flink/jobgraphs/<job-id> 1 [persistent]
 .
 .
 .
 +----O /flink/jobgraphs/<job-id> N [persistent]
 

The root path is watched to detect concurrent modifications in corner situations where multiple instances operate concurrently. The job manager acts as a ExecutionPlanStore.ExecutionPlanListener to react to such situations.

Constructor Summary

Constructors

Constructor	Description
ZooKeeperExecutionPlanStoreWatcher(org.apache.flink.shaded.curator5.org.apache.curator.framework.recipes.cache.PathChildrenCache pathCache)

Method Summary

Modifier and Type	Method	Description
void	start(ExecutionPlanStore.ExecutionPlanListener executionPlanListener)	Start the watcher on ExecutionPlanStore.
void	stop()	Stop the watcher on ExecutionPlanStore.

Methods inherited from class java.lang.Object

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

Constructor Details

ZooKeeperExecutionPlanStoreWatcher

public ZooKeeperExecutionPlanStoreWatcher(org.apache.flink.shaded.curator5.org.apache.curator.framework.recipes.cache.PathChildrenCache pathCache)

Method Details

start

public void start(ExecutionPlanStore.ExecutionPlanListener executionPlanListener)
           throws Exception

Description copied from interface: ExecutionPlanStoreWatcher

Start the watcher on ExecutionPlanStore.

Specified by:

start in interface ExecutionPlanStoreWatcher

Parameters:

executionPlanListener - use executionPlanListener to notify the DefaultExecutionPlanStore

Throws:

Exception - when start internal services

stop

public void stop()
          throws Exception

Description copied from interface: ExecutionPlanStoreWatcher

Stop the watcher on ExecutionPlanStore.

Specified by:

stop in interface ExecutionPlanStoreWatcher

Throws:

Exception - when stop internal services