Displaying #cassandra-dev/2017-06-30.log:

Fri Jun 30 00:01:53 2017  jeffj:'ant realclean' too
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Fri Jun 30 00:14:42 2017  driftx:and every once in a while, rm -rf ~/.m2
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Fri Jun 30 00:46:38 2017  fsparv:heh :)
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Fri Jun 30 04:41:37 2017  krut:but then how will i catch all the jars!
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Fri Jun 30 11:49:39 2017  fsparv:Ok patch added to https://issues.apache.org/jira/browse/CASSANDRA-13396 thx for help jeffj and driftx. How long is it till the next planned release (assuming folks like the patch)?
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Fri Jun 30 14:04:59 2017  iksaif_:I think that in CASSANDRA-13651 I found a case were the profiler is right to blame `epoll_wait()`
Fri Jun 30 14:05:00 2017  CassBotJr:https://issues.apache.org/jira/browse/CASSANDRA-13651 (Open; Unresolved; 4.x): "Large amount of CPU used by epoll_wait(.., .., .., 0)"
Fri Jun 30 14:12:57 2017  spodkowinski:maybe it would make more sense to open a netty github issue for that
Fri Jun 30 14:13:08 2017  spodkowinski:or is there anything you'd suggest that we can do on our side?
Fri Jun 30 14:20:14 2017  iksaif_:Well, I'm unsure, but I don't think netty can do much here
Fri Jun 30 14:20:34 2017  iksaif_:I think the real issue is that for each message we schedule a ~5-6 tasks
Fri Jun 30 14:21:00 2017  iksaif_:(as far as I understand the code in Message::Flusher::run())
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Fri Jun 30 14:50:48 2017  spodkowinski:I'd assume that in general there's always a trade-of here between spending cpu time on busy spinning and avoiding flushing messages too frequently. But I'm not familiar at all with the mentioned code lines, not saying you're not up on something there.
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Fri Jun 30 18:06:35 2017  iksaif_:spodkowinski: I'll try to continue investigating, see what can be improved here without affecting latency too much
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Fri Jun 30 20:03:11 2017  jasobrown:iksaif_: i can poke around on that ticket, as well, when i get back to the US in 1.5 weeks
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