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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