org.apache.flink.streaming.api.operators

接口 StreamTaskStateInitializer

所有已知实现类:

StreamTaskStateInitializerImpl

public interface StreamTaskStateInitializer

This is the interface through which stream task expose a StreamOperatorStateContext to their operators. Operators, in turn, can use the context to initialize everything connected to their state, such as backends or a timer service manager.

方法概要

限定符和类型

方法和说明

StreamOperatorStateContext

streamOperatorStateContext(org.apache.flink.runtime.jobgraph.OperatorID operatorID, String operatorClassName, ProcessingTimeService processingTimeService, KeyContext keyContext, org.apache.flink.api.common.typeutils.TypeSerializer<?> keySerializer, org.apache.flink.core.fs.CloseableRegistry streamTaskCloseableRegistry, org.apache.flink.metrics.MetricGroup metricGroup, double managedMemoryFraction, boolean isUsingCustomRawKeyedState) Returns the StreamOperatorStateContext for an AbstractStreamOperator that runs in the stream task that owns this manager.

方法详细资料

streamOperatorStateContext

StreamOperatorStateContext streamOperatorStateContext(@Nonnull
                                                      org.apache.flink.runtime.jobgraph.OperatorID operatorID,
                                                      @Nonnull
                                                      String operatorClassName,
                                                      @Nonnull
                                                      ProcessingTimeService processingTimeService,
                                                      @Nonnull
                                                      KeyContext keyContext,
                                                      @Nullable
                                                      org.apache.flink.api.common.typeutils.TypeSerializer<?> keySerializer,
                                                      @Nonnull
                                                      org.apache.flink.core.fs.CloseableRegistry streamTaskCloseableRegistry,
                                                      @Nonnull
                                                      org.apache.flink.metrics.MetricGroup metricGroup,
                                                      double managedMemoryFraction,
                                                      boolean isUsingCustomRawKeyedState)
                                               throws Exception

Returns the StreamOperatorStateContext for an AbstractStreamOperator that runs in the stream task that owns this manager.

参数:

operatorID - the id of the operator for which the context is created. Cannot be null.

operatorClassName - the classname of the operator instance for which the context is created. Cannot be null.

processingTimeService -

keyContext - the key context of the operator instance for which the context is created Cannot be null.

keySerializer - the key-serializer for the operator. Can be null.

streamTaskCloseableRegistry - the closeable registry to which created closeable objects will be registered.

metricGroup - the parent metric group for all statebackend metrics

managedMemoryFraction - the managed memory fraction of the operator for state backend

isUsingCustomRawKeyedState - flag indicating whether or not the AbstractStreamOperator is writing custom raw keyed state.

返回:

a context from which the given operator can initialize everything related to state.

抛出:

Exception - when something went wrong while creating the context.