Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/22042#discussion_r209473392
--- Diff:
external/kafka-0-10-sql/src/main/scala/org/apache/spark/sql/kafka010/KafkaDataConsumer.scala
---
@@ -31,6 +31,17 @@ import
org.apache.spark.sql.kafka010.KafkaDataConsumer.AvailableOffsetRange
import org.apache.spark.sql.kafka010.KafkaSourceProvider._
import org.apache.spark.util.UninterruptibleThread
+/**
+ * An exception to indicate there is a missing offset in the records
returned by Kafka consumer.
+ * This means it's either a transaction (commit or abort) marker, or an
aborted message if
+ * "isolation.level" is "read_committed". The offsets in the range
[offset, nextOffsetToFetch) are
+ * missing. In order words, `nextOffsetToFetch` indicates the next offset
to fetch.
+ */
+private[kafka010] class MissingOffsetException(
--- End diff --
nit: Is this meant to be used outside this KafkaDataConsumer class? If not,
then maybe make it an inner class to KafkaDataConsumer.
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