Github user delding commented on a diff in the pull request:
https://github.com/apache/flink/pull/2332#discussion_r77676350
--- 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);
--- End diff --
The assumption is that for each input value there will be only one
corresponding row to be modified. Users define how to extract a row key and
actions to be performed on this row key from a single input value. In other
words, the row key returned from rowKey(IN value) will be passed to
createMutations(byte[] rowKey, boolean writeToWAL) method called on the
instance returned from actions(IN value).
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastruct...@apache.org or file a JIRA ticket
with INFRA.
---
