ZooKeeperExecutionPlanStoreWatcher (Flink : Runtime 2.0.1 API)

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

All Methods Instance Methods Concrete Methods
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 Detail
  - ZooKeeperExecutionPlanStoreWatcher
```
public ZooKeeperExecutionPlanStoreWatcher(org.apache.flink.shaded.curator5.org.apache.curator.framework.recipes.cache.PathChildrenCache pathCache)
```
- Method Detail
  - 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