Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/17752#discussion_r113074883
--- Diff:
external/kafka-0-10-sql/src/main/scala/org/apache/spark/sql/kafka010/KafkaRelation.scala
---
@@ -53,9 +54,27 @@ private[kafka010] class KafkaRelation(
override def schema: StructType = KafkaOffsetReader.kafkaSchema
override def buildScan(): RDD[Row] = {
+ // Each running query should use its own group id. Otherwise, the
query may be only assigned
+ // partial data since Kafka will assign partitions to multiple
consumers having the same group
+ // id. Hence, we should generate a unique id for each query.
+ val uniqueGroupId = s"spark-kafka-relation-${UUID.randomUUID}"
--- End diff --
generate the unique group id and KafkaOffsetReader here, and close it
inside this method, so that we never use the same reader at different threads
(such as using the same DataFrame in different threads).
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