Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/15820#discussion_r88363098
--- Diff:
external/kafka-0-10-sql/src/main/scala/org/apache/spark/sql/kafka010/CachedKafkaConsumer.scala
---
@@ -47,40 +51,229 @@ 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.
* Sequential forward access will use buffers, but random access will be
horribly inefficient.
+ *
+ * If `failOnDataLoss` is `false`, it will try to get the earliest
record in
+ * `[offset, untilOffset)` when some illegal state happens. Otherwise,
an `IllegalStateException`
+ * will be thrown.
+ *
+ * It returns `null` only when `failOnDataLoss` is `false` and it cannot
fetch any record between
+ * [offset, untilOffset).
*/
- def get(offset: Long, pollTimeoutMs: Long): ConsumerRecord[Array[Byte],
Array[Byte]] = {
+ def get(
+ offset: Long,
+ untilOffset: Long,
+ pollTimeoutMs: Long,
+ failOnDataLoss: Boolean): ConsumerRecord[Array[Byte], Array[Byte]] =
{
+ require(offset < untilOffset, s"offset: $offset, untilOffset:
$untilOffset")
--- End diff --
give better error message, saying "offset must always be less than
untilOffset"
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