Github user zsxwing commented on the pull request:
https://github.com/apache/spark/pull/3378#issuecomment-63772021
My motivation is that we encountered a skew data set that a special hot key
has too many values and could not fit into memory. Spilling helps nothing in
this case since groupBy will put all values of a key into a CompactBuffer.
After this optimization, at least, my job could run using the same memory
limitation.
---
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]
