Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/11645#discussion_r57041029
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/state/StateStore.scala
---
@@ -0,0 +1,241 @@
+/*
+ * 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.spark.sql.execution.streaming.state
+
+import java.util.{Timer, TimerTask}
+
+import scala.collection.mutable
+import scala.util.control.NonFatal
+
+import org.apache.hadoop.conf.Configuration
+
+import org.apache.spark.SparkEnv
+import org.apache.spark.internal.Logging
+import org.apache.spark.sql.catalyst.expressions.UnsafeRow
+import org.apache.spark.sql.types.StructType
+
+
+/** Unique identifier for a [[StateStore]] */
+case class StateStoreId(checkpointLocation: String, operatorId: Long,
partitionId: Int)
+
+/**
+ * Base trait for a versioned key-value store used for streaming
aggregations
+ */
+trait StateStore {
+
+ /** Unique identifier of the store */
+ def id: StateStoreId
+
+ /** Version of the data in this store before committing updates. */
+ def version: Long
+
+ /**
+ * Update the value of a key using the value generated by the update
function.
+ * @note Do not mutate the retrieved value row as it will unexpectedly
affect the previous
+ * versions of the store data.
+ */
+ def update(key: UnsafeRow, updateFunc: Option[UnsafeRow] => UnsafeRow):
Unit
+
+ /**
+ * Remove keys that match the following condition.
+ */
+ def remove(condition: UnsafeRow => Boolean): Unit
+
+ /**
+ * Commit all the updates that have been made to the store.
+ */
+ def commit(): Long
--- End diff --
nit: the meaning of the return value
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