Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/9143#discussion_r43336941
--- Diff:
streaming/src/main/scala/org/apache/spark/streaming/scheduler/ReceivedBlockTracker.scala
---
@@ -235,8 +297,84 @@ 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 =>
+ val thread = new Thread(runnable, "Batch WAL Writer")
+ thread.setDaemon(true)
+ thread.start()
+ }
+ writer
+ }
+
/** Check if the write ahead log is enabled. This is only used for
testing purposes. */
private[streaming] def isWriteAheadLogEnabled: Boolean =
writeAheadLogOption.nonEmpty
+
+ /** A helper class that writes LogEvents in a separate thread to allow
for batching. */
+ private[streaming] class BatchLogWriter extends Runnable {
--- End diff --
BatchLogWriter -> BatchedLogWriter
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