Github user koeninger commented on a diff in the pull request:
https://github.com/apache/spark/pull/15504#discussion_r84378170
--- Diff:
external/kafka-0-10-sql/src/main/scala/org/apache/spark/sql/kafka010/JsonUtils.scala
---
@@ -0,0 +1,115 @@
+/*
+ * 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.kafka010
+
+import java.io.Writer
+
+import scala.collection.mutable.{ ArrayBuffer, HashMap }
+import scala.util.control.NonFatal
+
+import com.fasterxml.jackson.databind.ObjectMapper
+import com.fasterxml.jackson.databind.node._
+import org.apache.kafka.common.TopicPartition
+
+/**
+ * Utilities for converting Kafka related objects to and from json.
+ */
+private object JsonUtils {
--- End diff --
KafkaSourceOffset is a Map[TopicPartition, Long]. This PR has an api for a
user to provide a Map[TopicPartition, Long]. There's an existing ticket for
making the metadata log store user-readable json. This PR uses json. Are they
really unrelated? Why would we want a second, different, json format for the
same information....
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