Github user revans2 commented on a diff in the pull request:
https://github.com/apache/storm/pull/2433#discussion_r173201619
--- Diff:
storm-client/src/jvm/org/apache/storm/assignments/ILocalAssignmentsBackend.java
---
@@ -0,0 +1,113 @@
+/**
+ * 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.storm.assignments;
+
+import java.util.List;
+import java.util.Map;
+
+import org.apache.storm.generated.Assignment;
+
+/**
+ * Interface for storing local assignments.
+ */
+public interface ILocalAssignmentsBackend {
+ /**
+ * Decide if the assignments is synchronized from remote state-store.
+ */
+ boolean isSynchronized();
+
+ /**
+ * Mark this backend as synchronized when sync work is done.
+ */
+ void setSynchronized();
+
+ /**
+ * Initial function for creating backend.
+ * @param conf config
+ */
+ void prepare(Map conf);
+
+ /**
+ * Keep a storm assignment to local state or update old assignment.
+ * @param stormID storm runtime id
+ * @param assignment assignment as thrift
+ */
+ void keepOrUpdateAssignment(String stormID, Assignment assignment);
--- End diff --
nit: change `stormID` to `stormId` or `topologyId`.
---
