Github user colorant commented on the pull request: https://github.com/apache/spark/pull/1499#issuecomment-50296194 I observe that a groupby case is much slower ( several times? ) with this manager than the hash based one. not sure is there anything need to tune, but the data set I run is pretty small so should not have much thing to tune.
--- 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. ---