Github user ijokarumawak commented on a diff in the pull request:
https://github.com/apache/nifi/pull/2947#discussion_r220458232
--- Diff:
nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-framework-core/src/main/java/org/apache/nifi/controller/queue/clustered/partition/FlowFilePartitioner.java
---
@@ -0,0 +1,53 @@
+/*
+ * 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.controller.queue.clustered.partition;
+
+import org.apache.nifi.controller.repository.FlowFileRecord;
+
+public interface FlowFilePartitioner {
+
+ /**
+ * Determines which partition the given FlowFile should go to
+ *
+ * @param flowFile the FlowFile to partition
+ * @param partitions the partitions to choose from
+ * @param localPartition the local partition, which is also included
in the given array of partitions
+ * @return the partition for the FlowFile
+ */
+ QueuePartition getPartition(FlowFileRecord flowFile, QueuePartition[]
partitions, QueuePartition localPartition);
+
+ /**
+ * @return <code>true</code> if a change in the size of a cluster
should result in re-balancing all FlowFiles in queue,
+ * <code>false</code> if a change in the size of a cluster
does not require re-balancing.
+ */
+ boolean isRebalanceOnClusterResize();
--- End diff --
Trivial, but I prefer `shouldRebalanceOnClusterResize()` or
`shouldRebalanceOnClusterTopologyChange`.
---
