Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/3721#discussion_r22091865
--- Diff:
streaming/src/main/scala/org/apache/spark/streaming/util/WriteAheadLogManager.scala
---
@@ -125,7 +125,7 @@ private[streaming] class WriteAheadLogManager(
* between the node calculating the threshTime (say, driver node), and
the local system time
* (say, worker node), the caller has to take account of possible time
skew.
*/
- def cleanupOldLogs(threshTime: Long): Unit = {
+ def cleanupOldLogs(threshTime: Long): Future[Unit] = {
--- End diff --
What's more, if we really want to change it to a asynchronously deleting.
Returning Future does still work. Just simply writing something like:
```scala
deleteFiles()
return Promise[Unit]().success(null).future
```
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