Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/2097#issuecomment-53142645
IIRC this is intentionally undocumented. It was introduced as a safety
latch in case a bug was found with reference tracking. Currently we never ask
users to change this from the default and we might e.g. remove it later.
---
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 [email protected] or file a JIRA ticket
with INFRA.
---
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
