Github user tillrohrmann commented on a diff in the pull request:

    https://github.com/apache/flink/pull/5487#discussion_r170015457
  
    --- Diff: 
flink-runtime/src/main/java/org/apache/flink/runtime/rest/messages/RescaleParallelismQueryParameter.java
 ---
    @@ -0,0 +1,41 @@
    +/*
    + * 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.rest.messages;
    +
    +/**
    + * Parallelism for the rescaling of jobs specified as a {@link 
MessageQueryParameter}.
    + */
    +public class RescaleParallelismQueryParameter extends 
MessageQueryParameter<Integer> {
    +
    +   public static final String KEY = "parallelism";
    +
    +   protected RescaleParallelismQueryParameter() {
    +           super(KEY, MessageParameterRequisiteness.MANDATORY);
    +   }
    +
    +   @Override
    +   public Integer convertValueFromString(String value) {
    +           return Integer.valueOf(value);
    --- End diff --
    
    Will add it to the `JobMaster`.


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