Github user jerryshao commented on the pull request:
https://github.com/apache/spark/pull/1327#issuecomment-48329176
It is alright if this class is not reopen supported, but seems there is not
obvious fence to defend user to reuse this object, so at least this
modification will not lead to error.
If we really want to defend reopen of this object, `open()` should not be
exposed to the user.
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastruct...@apache.org or file a JIRA ticket
with INFRA.
---
