murblanc commented on a change in pull request #1684:
URL: https://github.com/apache/lucene-solr/pull/1684#discussion_r468415587



##########
File path: 
solr/core/src/java/org/apache/solr/cluster/placement/ReplicaPlacement.java
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@@ -0,0 +1,29 @@
+/*
+ * 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.solr.cluster.placement;
+
+/**
+ * <p>Placement decision for a single {@link Replica}. Note this placement 
decision is used as part of a {@link WorkOrder},
+ * it does not directly lead to the plugin code getting a corresponding {@link 
Replica} instance, nor does it require the
+ * plugin to provide a {@link Shard} instance (the plugin code gets such 
instances for existing replicas and shards in the
+ * cluster but does not create them directly for adding new replicas for new 
or existing shards).
+ *
+ * <p>Captures the {@link Shard} (via the shard name), {@link Node} and {@link 
Replica.ReplicaType} of a Replica to be created.
+ */
+public interface ReplicaPlacement {

Review comment:
       Solr code will not be using these interfaces. This will be clearer once 
I'm back from vacation and implement the solr side of things. Solr will only be 
using the concrete implementations of the interfaces so will have access to 
everything it needs. 




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