Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/17752#discussion_r113075321
--- 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 --
note: previous codes forget to close `KafkaOffsetReader`
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