Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/15131
I just took a look. The problematic code is here,
[SparkContext.scala#L1429](https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/SparkContext.scala#L1429).
We should not directly use `new URI` with Windows path because the paths
such as `C:\a\b\c` is not the valid URI as below:
```scala
scala> new
java.net.URI("C:\\Users\\appveyor\\AppData\\Local\\Temp\\1\\RtmpegI4mr\\hello92023051e13.txt")
java.net.URISyntaxException: Illegal character in opaque part at index 2:
C:\Users\appveyor\AppData\Local\Temp\1\RtmpegI4mr\hello92023051e13.txt
at java.net.URI$Parser.fail(URI.java:2848)
at java.net.URI$Parser.checkChars(URI.java:3021)
at java.net.URI$Parser.parse(URI.java:3058)
at java.net.URI.<init>(URI.java:588)
... 33 elided
```
I took a look the APIs taking `path` as an argument in `SparkContext` and
it seems this one is only the case. It seems the similar case is being handled
in
[SparkContext.scala#L1702-L1707](https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/SparkContext.scala#L1702-L1707).
I can open a separate PR, post a PR to @yanboliang's forked repo or just
let you fix this in here. Please let me know.
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