Apache Bigtop source code is no longer hosted in SVN.

If you are committer please checkout:
  https://<your id>@git-wip-us.apache.org/repos/asf/bigtop.git

If you're a contributor/user:
  https://git-wip-us.apache.org/repos/asf/bigtop.git

And if you just want to browse:
  https://git-wip-us.apache.org/repos/asf?p=bigtop.git