Package org.apache.flink.runtime.query

Class KvStateRegistry

java.lang.Object

org.apache.flink.runtime.query.KvStateRegistry

public class KvStateRegistry
extends Object

A registry for InternalKvState instances per task manager.

This is currently only used for KvState queries: KvState instances, which are marked as queryable in their state descriptor are registered here and can be queried by the KvStateServer.

KvState is registered when it is created/restored and unregistered when the owning operator stops running.

Constructor Summary

Constructors

Constructor	Description
KvStateRegistry()

Method Summary

Modifier and Type	Method	Description
TaskKvStateRegistry	createTaskRegistry(org.apache.flink.api.common.JobID jobId, JobVertexID jobVertexId)	Creates a TaskKvStateRegistry facade for the Task identified by the given JobID and JobVertexID instance.
KvStateEntry<?,?,?>	getKvState(org.apache.flink.queryablestate.KvStateID kvStateId)	Returns the KvStateEntry containing the requested instance as identified by the given KvStateID, along with its KvStateInfo or null if none is registered.
org.apache.flink.queryablestate.KvStateID	registerKvState(org.apache.flink.api.common.JobID jobId, JobVertexID jobVertexId, KeyGroupRange keyGroupRange, String registrationName, InternalKvState<?,?,?> kvState, ClassLoader userClassLoader)	Registers the KvState instance and returns the assigned ID.
void	registerListener(org.apache.flink.api.common.JobID jobId, KvStateRegistryListener listener)	Registers a listener with the registry.
void	unregisterKvState(org.apache.flink.api.common.JobID jobId, JobVertexID jobVertexId, KeyGroupRange keyGroupRange, String registrationName, org.apache.flink.queryablestate.KvStateID kvStateId)	Unregisters the KvState instance identified by the given KvStateID.
void	unregisterListener(org.apache.flink.api.common.JobID jobId)	Unregisters the listener with the registry.

Methods inherited from class java.lang.Object

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

Constructor Details

KvStateRegistry

public KvStateRegistry()

Method Details

registerListener

public void registerListener(org.apache.flink.api.common.JobID jobId,
 KvStateRegistryListener listener)

Registers a listener with the registry.

Parameters:

jobId - identifying the job for which to register a KvStateRegistryListener

listener - The registry listener.

Throws:

IllegalStateException - If there is a registered listener

unregisterListener

public void unregisterListener(org.apache.flink.api.common.JobID jobId)

Unregisters the listener with the registry.

Parameters:

jobId - for which to unregister the KvStateRegistryListener

registerKvState

public org.apache.flink.queryablestate.KvStateID registerKvState(org.apache.flink.api.common.JobID jobId,
 JobVertexID jobVertexId,
 KeyGroupRange keyGroupRange,
 String registrationName,
 InternalKvState<?,?,?> kvState,
 ClassLoader userClassLoader)

Registers the KvState instance and returns the assigned ID.

Parameters:

jobId - JobId the KvState instance belongs to

jobVertexId - JobVertexID the KvState instance belongs to

keyGroupRange - Key group range the KvState instance belongs to

registrationName - Name under which the KvState is registered

kvState - KvState instance to be registered

Returns:

Assigned KvStateID

unregisterKvState

public void unregisterKvState(org.apache.flink.api.common.JobID jobId,
 JobVertexID jobVertexId,
 KeyGroupRange keyGroupRange,
 String registrationName,
 org.apache.flink.queryablestate.KvStateID kvStateId)

Unregisters the KvState instance identified by the given KvStateID.

Parameters:

jobId - JobId the KvState instance belongs to

kvStateId - KvStateID to identify the KvState instance

keyGroupRange - Key group range the KvState instance belongs to

getKvState

public KvStateEntry<?,?,?> getKvState(org.apache.flink.queryablestate.KvStateID kvStateId)

Returns the KvStateEntry containing the requested instance as identified by the given KvStateID, along with its KvStateInfo or null if none is registered.

Parameters:

kvStateId - KvStateID to identify the KvState instance

Returns:

The KvStateEntry instance identified by the KvStateID or null if there is none

createTaskRegistry

public TaskKvStateRegistry createTaskRegistry(org.apache.flink.api.common.JobID jobId,
 JobVertexID jobVertexId)

Creates a TaskKvStateRegistry facade for the Task identified by the given JobID and JobVertexID instance.

Parameters:

jobId - JobID of the task

jobVertexId - JobVertexID of the task

Returns:

A TaskKvStateRegistry facade for the task