Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/9143#discussion_r42719556
--- Diff:
streaming/src/main/scala/org/apache/spark/streaming/scheduler/ReceivedBlockTracker.scala
---
@@ -235,8 +350,67 @@ private[streaming] class ReceivedBlockTracker(
}
}
+ /**
+ * Creates a WAL Writer in a separate thread to enable batching of log
events.
+ * Exposed for tests.
+ */
+ protected def createBatchWriteAheadLogWriter(): Option[BatchLogWriter] =
{
+ if (!WriteAheadLogUtils.isBatchingEnabled(conf)) return None
+ val writer = checkpointDirOption.map(_ => new BatchLogWriter)
+ writer.foreach { runnable =>
+ new Thread(runnable, "Batch WAL Writer").start()
--- End diff --
It's better to set this thread to daemon.
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