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ASF GitHub Bot commented on FLINK-4844: --------------------------------------- Github user aljoscha commented on a diff in the pull request: https://github.com/apache/flink/pull/2648#discussion_r83678698 --- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/state/ManagedInitializationContext.java --- @@ -0,0 +1,53 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package org.apache.flink.runtime.state; + +import org.apache.flink.api.common.state.KeyedStateStore; +import org.apache.flink.api.common.state.OperatorStateStore; + +/** + * This interface provides a context in which operators can initialize by registering to managed state (i.e. state that + * is managed by state backends). + * <p/> + * + * Operator state is available to all operators, while keyed state is only available for operators after keyBy. + * <p/> + * + * For the purpose of initialization, the context signals if the state is empty (new operator) or was restored from + * a previous execution of this operator. + * + */ +public interface ManagedInitializationContext { --- End diff -- I think this interface and its sub interfaces/implementations should be in the same module as `AbstractStreamOperator` and somewhere in the api package space. Also, the naming could be changed to something like `StateInitializationContext` -> `FunctionInitializationContext` -> `OperatorInitializationContext`. Or something reflecting their purpose but `StateInitializationContext` should be at the bottom of the hierarchy. > Partitionable Raw Keyed/Operator State > -------------------------------------- > > Key: FLINK-4844 > URL: https://issues.apache.org/jira/browse/FLINK-4844 > Project: Flink > Issue Type: New Feature > Reporter: Stefan Richter > Assignee: Stefan Richter > > Partitionable operator and keyed state are currently only available by using > backends. However, the serialization code for many operators is build around > reading/writing their state to a stream for checkpointing. We want to provide > partitionable states also through streams, so that migrating existing > operators becomes more easy. -- This message was sent by Atlassian JIRA (v6.3.4#6332)