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

    https://github.com/apache/flink/pull/2332#discussion_r79420572
  
    --- Diff: 
flink-streaming-connectors/flink-connector-hbase/src/main/java/org/apache/flink/streaming/connectors/hbase/HBaseMapper.java
 ---
    @@ -0,0 +1,46 @@
    +/*
    + * 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.streaming.connectors.hbase;
    +
    +import org.apache.flink.api.common.functions.Function;
    +
    +import java.io.Serializable;
    +
    +/**
    + * Maps a input value to a row in HBase table.
    + *
    + * @param <IN> input type
    + */
    +public interface HBaseMapper<IN> extends Function, Serializable {
    +
    +   /**
    +    * Given an input value return the HBase row key. Row key cannot be 
null.
    +    *
    +    * @param value
    +    * @return row key
    +    */
    +   byte[] rowKey(IN value);
    +
    +   /**
    +    * Given an input value return a list of actions of to be performed on 
a single row in HBase table.
    +    *
    +    * @param value
    +    * @return a list of mutation actions
    +    */
    +   MutationActions actions(IN value);
    --- End diff --
    
    if we change the signature to `void actions(IN value, List<Mutation> 
actions)`, we can reuse the `List` object and do not need the `MutationActions` 
class.


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