Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/10203#discussion_r47396435
--- Diff:
extras/kinesis-asl/src/main/scala/org/apache/spark/streaming/kinesis/KinesisReceiver.scala
---
@@ -124,8 +125,7 @@ private[kinesis] class KinesisReceiver[T](
private val seqNumRangesInCurrentBlock = new
mutable.ArrayBuffer[SequenceNumberRange]
/** Sequence number ranges of data added to each generated block */
- private val blockIdToSeqNumRanges = new mutable.HashMap[StreamBlockId,
SequenceNumberRanges]
- with mutable.SynchronizedMap[StreamBlockId, SequenceNumberRanges]
+ private val blockIdToSeqNumRanges = new ConcurrentHashMap[StreamBlockId,
SequenceNumberRanges]
--- End diff --
It's probably always a good idea to use `ConcurrentHashMap` instead of the
mixed-in trait. The typesafe people themselves deprecated the trait and said
it's unreliable and recommended that users use java's map instead.
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