Github user steveloughran commented on a diff in the pull request:
https://github.com/apache/spark/pull/14731#discussion_r103183646
--- Diff:
streaming/src/main/scala/org/apache/spark/streaming/dstream/FileInputDStream.scala
---
@@ -140,7 +137,7 @@ class FileInputDStream[K, V, F <: NewInputFormat[K, V]](
* a union RDD out of them. Note that this maintains the list of files
that were processed
* in the latest modification time in the previous call to this method.
This is because the
* modification time returned by the FileStatus API seems to return
times only at the
- * granularity of seconds. And new files may have the same modification
time as the
+ * granularity of seconds in HDFS. And new files may have the same
modification time as the
* latest modification time in the previous call to this method yet was
not reported in
--- End diff --
no, it really is HDFS alone. We have no idea whatsoever about the
granuarity of other filesystems. Could be 2 seconds (is FAT 32 supported? Hope
not) NTFS is in nanoseconds
[apparently](https://msdn.microsoft.com/en-us/library/windows/desktop/ms724290(v=vs.85).aspx).
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