Github user tillrohrmann commented on a diff in the pull request:

    https://github.com/apache/flink/pull/6178#discussion_r196701452
  
    --- Diff: 
flink-runtime/src/main/java/org/apache/flink/runtime/rest/FileUploadHandler.java
 ---
    @@ -116,5 +136,16 @@ private void reset() {
                currentHttpPostRequestDecoder.destroy();
                currentHttpPostRequestDecoder = null;
                currentHttpRequest = null;
    +           currentUploadDir = null;
    +           currentJsonPayload = null;
    +   }
    +
    +   public static Optional<byte[]> 
getMultipartJsonPayload(ChannelHandlerContext ctx) {
    +           return 
Optional.ofNullable(ctx.channel().attr(UPLOADED_JSON).get());
    +   }
    +
    +   public static FileUploads getMultipartFileUploads(ChannelHandlerContext 
ctx) {
    +           return 
Optional.ofNullable(ctx.channel().attr(UPLOADED_FILES).get())
    +                   .orElse(FileUploads.EMPTY);
    --- End diff --
    
    I think not much. My gut feeling is just that `FileUploads` can be 
simplified. Instead of having our own FileVisitor, we could simply call 
`FileUtils.deleteDirectory(uploadDirectory)`. And I think  this class has 
actually two responsibilities: Listing all files to make them accessible and 
storing the directories in which they reside to delete them afterwards.


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