Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/12712#discussion_r61289272
--- Diff:
streaming/src/main/scala/org/apache/spark/streaming/Checkpoint.scala ---
@@ -184,8 +184,7 @@ class CheckpointWriter(
val executor = Executors.newFixedThreadPool(1)
val compressionCodec = CompressionCodec.createCodec(conf)
private var stopped = false
- private var _fs: FileSystem = _
-
+ @volatile private[this] var fs: FileSystem = null
--- End diff --
It's actually referenced by inner classes. I think the idea here is that
we'll avoid calling `.getFileSystem` too much by caching the result, but will
have the ability to clear the cache in case the cached FileSystem seems to be
in a bad state.
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