How advanced is the Structured Streaming functionality? Looking at the JIRA [1] I cannot find even design prototype there, which is kind of strange if they want to have it ready by end of April. But as there was a presentation on the topic at the summit [2], I hope it's just developing it without discussion on JIRA.

[1] https://issues.apache.org/jira/browse/SPARK-8360 [2] https://spark-summit.org/east-2016/events/keynote-day-3/