Github user mattyb149 commented on a diff in the pull request:

    https://github.com/apache/nifi/pull/2558#discussion_r180771727
  
    --- Diff: 
nifi-nar-bundles/nifi-standard-services/nifi-lookup-services-bundle/nifi-lookup-services/src/main/java/org/apache/nifi/lookup/DistributedMapCacheLookupService.java
 ---
    @@ -0,0 +1,127 @@
    +/*
    + * 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.nifi.lookup;
    +
    +import java.io.IOException;
    +import java.io.OutputStream;
    +import java.nio.charset.StandardCharsets;
    +import java.util.ArrayList;
    +import java.util.List;
    +import java.util.Map;
    +import java.util.Optional;
    +import java.util.Set;
    +import java.util.stream.Collectors;
    +import java.util.stream.Stream;
    +
    +import org.apache.nifi.annotation.documentation.CapabilityDescription;
    +import org.apache.nifi.annotation.documentation.Tags;
    +import org.apache.nifi.annotation.lifecycle.OnEnabled;
    +import org.apache.nifi.components.PropertyDescriptor;
    +import org.apache.nifi.components.Validator;
    +import org.apache.nifi.controller.AbstractControllerService;
    +import org.apache.nifi.controller.ConfigurationContext;
    +import org.apache.nifi.distributed.cache.client.Deserializer;
    +import org.apache.nifi.distributed.cache.client.DistributedMapCacheClient;
    +import org.apache.nifi.distributed.cache.client.Serializer;
    +import 
org.apache.nifi.distributed.cache.client.exception.DeserializationException;
    +import 
org.apache.nifi.distributed.cache.client.exception.SerializationException;
    +
    +@Tags({"lookup", "enrich", "key", "value", "map", "cache", "distributed"})
    +@CapabilityDescription("Allows to choose a distributed map cache client to 
retrieve the value associated to a key. "
    +    + "The coordinates that are passed to the lookup must contain the key 
'key'.")
    +public class DistributedMapCacheLookupService extends 
AbstractControllerService implements StringLookupService {
    +    private static final String KEY = "key";
    --- End diff --
    
    Does requiring a single key "key" mean we can only do one lookup at a time? 
Perhaps we should not require any keys and let the dynamic properties define 
the lookup keys?


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