Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/15820#discussion_r88758179
--- Diff:
external/kafka-0-10-sql/src/main/scala/org/apache/spark/sql/kafka010/CachedKafkaConsumer.scala
---
@@ -47,40 +51,191 @@ private[kafka010] case class CachedKafkaConsumer
private(
/** Iterator to the already fetch data */
private var fetchedData =
ju.Collections.emptyIterator[ConsumerRecord[Array[Byte], Array[Byte]]]
- private var nextOffsetInFetchedData = -2L
+ private var nextOffsetInFetchedData = UNKNOWN_OFFSET
/**
* Get the record for the given offset, waiting up to timeout ms if IO
is necessary.
--- End diff --
nit: update docs to clarify earlier that this may not return offset
Get the record for the given offset if available. Otherwise it will either
throw error (if failOnDataLoss = true), or return the next available offset
within [offset, untilOffset].
Use @param to explain pollTimeoutMs and others in more detail
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