Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/9373#discussion_r43948049
--- Diff:
streaming/src/main/scala/org/apache/spark/streaming/util/FileBasedWriteAheadLog.scala
---
@@ -126,11 +127,11 @@ private[streaming] class FileBasedWriteAheadLog(
val logFilesToRead = pastLogs.map{ _.path} ++ currentLogPath
logInfo("Reading from the logs: " + logFilesToRead.mkString("\n"))
- logFilesToRead.iterator.map { file =>
+ logFilesToRead.par.map { file =>
--- End diff --
Which threadpool / execution context is this par operation going to? You
must not use the default system execution.
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