Github user jiangxb1987 commented on a diff in the pull request:
https://github.com/apache/spark/pull/20292#discussion_r163149674
--- Diff:
core/src/main/scala/org/apache/spark/util/collection/ExternalAppendOnlyMap.scala
---
@@ -509,8 +509,8 @@ class ExternalAppendOnlyMap[K, V, C](
*/
private def readNextItem(): (K, C) = {
try {
- val k = deserializeStream.readKey().asInstanceOf[K]
- val c = deserializeStream.readValue().asInstanceOf[C]
+ val k = deserializeStream.get.readKey().asInstanceOf[K]
--- End diff --
We should still check `deserializeStream` is not emtpy here to be safe
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