Github user Gauravshah commented on a diff in the pull request:
https://github.com/apache/spark/pull/16842#discussion_r99929314
--- Diff:
external/kinesis-asl/src/main/scala/org/apache/spark/streaming/kinesis/KinesisBackedBlockRDD.scala
---
@@ -36,7 +36,8 @@ import org.apache.spark.util.NextIterator
/** Class representing a range of Kinesis sequence numbers. Both sequence
numbers are inclusive. */
private[kinesis]
case class SequenceNumberRange(
- streamName: String, shardId: String, fromSeqNumber: String,
toSeqNumber: String)
+ streamName: String, shardId: String, fromSeqNumber: String,
toSeqNumber: String,
+ recordCount: Int)
--- End diff --
its an input to spark checkpoint metadata. On streaming KinesisReceiver
receives records creates blocks & knows about seqNumber, count. When recovering
from checkpoint we read back this information from checkpoint and make aws
kinesis getRecords call with fromSeqNumber & limit
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