Deprecate org.apache.cassandra.hadoop code

patch by Stefan Miklosovic; reviewed by Brandon Williams for CASSANDRA-16984

CHANGES.txt

@@ -1,4 +1,5 @@
 4.1.1
+ * Deprecate org.apache.cassandra.hadoop code (CASSANDRA-16984)
  * Fix too early schema version change in sysem local table (CASSANDRA-18291)
  * Fix copying of JAR of a trigger to temporary file (CASSANDRA-18264)
  * Fix possible NoSuchFileException when removing a snapshot (CASSANDRA-18211)

NEWS.txt

@@ -70,6 +70,11 @@ Upgrading
      4.1.0 or 4.0.0-4.0.7. If that is your case, please use protocol v4 or higher in your driver. See CASSANDRA-17507
      for further details.
 
+Deprecation
+-----------
+    - Hadoop integration in package org.apache.cassandra.hadoop is deprecated and no longer actively maintained.
+      This code is scheduled to be removed in the next major version of Cassandra.
+
 4.1
 ===
 

src/java/org/apache/cassandra/hadoop/package-info.java

@@ -0,0 +1,23 @@
+/*
+ * 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.
+ */
+
+/**
+ * This package was deprecated. See CASSANDRA-16984.
+ */
+@Deprecated
+package org.apache.cassandra.hadoop;