Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/20096#discussion_r159503021
--- Diff:
external/kafka-0-10-sql/src/main/scala/ContinuousKafkaReader.scala ---
@@ -0,0 +1,246 @@
+/*
+ * 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._
+import java.nio.charset.StandardCharsets
+import java.util.concurrent.atomic.AtomicBoolean
+
+import org.apache.commons.io.IOUtils
+import org.apache.kafka.clients.consumer.ConsumerRecord
+import org.apache.kafka.common.TopicPartition
+import org.apache.kafka.common.errors.WakeupException
+
+import org.apache.spark.internal.Logging
+import org.apache.spark.sql.{DataFrame, Row, SparkSession, SQLContext}
+import org.apache.spark.sql.catalyst.expressions.{Attribute, Cast,
Literal, UnsafeProjection, UnsafeRow}
+import org.apache.spark.sql.catalyst.expressions.codegen.{BufferHolder,
UnsafeRowWriter}
+import org.apache.spark.sql.catalyst.util.DateTimeUtils
+import org.apache.spark.sql.execution.streaming.{HDFSMetadataLog,
SerializedOffset}
+import
org.apache.spark.sql.kafka010.KafkaSource.{INSTRUCTION_FOR_FAIL_ON_DATA_LOSS_FALSE,
INSTRUCTION_FOR_FAIL_ON_DATA_LOSS_TRUE, VERSION}
+import org.apache.spark.sql.sources.v2.reader._
+import
org.apache.spark.sql.sources.v2.streaming.reader.{ContinuousDataReader,
ContinuousReader, Offset, PartitionOffset}
+import org.apache.spark.sql.types.StructType
+import org.apache.spark.unsafe.types.UTF8String
+
+class ContinuousKafkaReader(
--- End diff --
Add docs explaining params.
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