Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/16109#discussion_r91176023
--- Diff:
external/kafka-0-10-sql/src/main/scala/org/apache/spark/sql/kafka010/CachedKafkaConsumer.scala
---
@@ -190,10 +194,31 @@ private[kafka010] case class CachedKafkaConsumer
private(
} else {
val record = fetchedData.next()
nextOffsetInFetchedData = record.offset + 1
- // `seek` is always called before "poll". So "record.offset" must be
same as "offset".
- assert(record.offset == offset,
- s"The fetched data has a different offset: expected $offset but
was ${record.offset}")
- record
+ // In general, Kafka uses the specified offset as the start point,
and tries to fetch the next
--- End diff --
Based on
https://github.com/apache/kafka/blob/0.10.0.1/core/src/main/scala/kafka/log/Log.scala#L488
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