Thanks a lot ... I was actually already at 6gb heap.
I guess the large number of merges (1.000.000) were causing the original issue. The hangs in the UI I think are unrelated. Again, I'm on 1.0.0-SNAPSHOT. I have a very simple flow right now that reads an S3 bucket and writes it to a file. Bucket contains 6 files (50kb each). Don't know exactly how to reproduce it, but this usually does it : - Stop a processor that's active - Delete it (pressing backspace quickly - Nifi stays the processor is still running - probably still shutting down) - Delete it (again pressing backspace quickly - UI / Nifi process hangs) When it hangs it hangs good... I can't do thread dumps on the java process anymore, and cannot attach with jstat. -- View this message in context: http://apache-nifi-developer-list.39713.n7.nabble.com/UI-can-take-a-very-long-time-to-become-available-tp12201p12265.html Sent from the Apache NiFi Developer List mailing list archive at Nabble.com.
