org.apache.flink.runtime.broadcast

Class BroadcastVariableManager

java.lang.Object

org.apache.flink.runtime.broadcast.BroadcastVariableManager

public class BroadcastVariableManager
extends Object

The BroadcastVariableManager is used to manage the materialization of broadcast variables. References to materialized broadcast variables are cached and shared between parallel subtasks. A reference count is maintained to track whether the materialization may be cleaned up.

Constructor Summary

Constructors

Constructor and Description
BroadcastVariableManager()

Method Summary

Modifier and Type	Method and Description
int	getNumberOfVariablesWithReferences()
<T> BroadcastVariableMaterialization<T,?>	materializeBroadcastVariable(String name, int superstep, BatchTask<?,?> holder, MutableReader<?> reader, org.apache.flink.api.common.typeutils.TypeSerializerFactory<T> serializerFactory) Materializes the broadcast variable for the given name, scoped to the given task and its iteration superstep.
void	releaseAllReferencesFromTask(BatchTask<?,?> referenceHolder)
void	releaseReference(BroadcastVariableKey key, BatchTask<?,?> referenceHolder)
void	releaseReference(String name, int superstep, BatchTask<?,?> referenceHolder)

Methods inherited from class java.lang.Object

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

Constructor Detail

BroadcastVariableManager

public BroadcastVariableManager()

Method Detail

materializeBroadcastVariable

public <T> BroadcastVariableMaterialization<T,?> materializeBroadcastVariable(String name,
                                                                              int superstep,
                                                                              BatchTask<?,?> holder,
                                                                              MutableReader<?> reader,
                                                                              org.apache.flink.api.common.typeutils.TypeSerializerFactory<T> serializerFactory)
                                                                       throws IOException

Materializes the broadcast variable for the given name, scoped to the given task and its iteration superstep. An existing materialization created by another parallel subtask may be returned, if it hasn't expired yet.

Throws:

IOException

releaseReference

public void releaseReference(String name,
                             int superstep,
                             BatchTask<?,?> referenceHolder)

releaseReference

public void releaseReference(BroadcastVariableKey key,
                             BatchTask<?,?> referenceHolder)

releaseAllReferencesFromTask

public void releaseAllReferencesFromTask(BatchTask<?,?> referenceHolder)

getNumberOfVariablesWithReferences

public int getNumberOfVariablesWithReferences()