Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/17617#discussion_r119274153
--- Diff: core/src/main/scala/org/apache/spark/deploy/SparkHadoopUtil.scala
---
@@ -143,14 +144,18 @@ class SparkHadoopUtil extends Logging {
* Returns a function that can be called to find Hadoop FileSystem bytes
read. If
* getFSBytesReadOnThreadCallback is called from thread r at time t, the
returned callback will
* return the bytes read on r since t.
- *
- * @return None if the required method can't be found.
*/
private[spark] def getFSBytesReadOnThreadCallback(): () => Long = {
--- End diff --
let's update the document to say that, the returned function may be called
in multiple threads.
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