Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/11625#discussion_r56094406
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/MetadataLog.scala
---
@@ -0,0 +1,56 @@
+/*
+* 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
+
+/**
+ * A general MetadataLog that supports the following features:
+ *
+ * - Allow the user to store a metadata object for each batch.
+ * - Allow the user to query the latest batch id.
+ * - Allow the user to query the metadata object of a specified batch id.
+ * - Allow the user to query metadata objects in a range of batch ids.
+ */
+trait MetadataLog[T] {
+
+ /**
+ * Store the metadata for the specified batchId. If batchId's metadata
has already been stored,
+ * this method does nothing.
--- End diff --
Update these docs
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