Github user aljoscha commented on a diff in the pull request:
    --- Diff: 
    @@ -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
    + *
    + *
    + *
    + * 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 
    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.

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