Displaying #cassandra-dev/2017-01-02.log:

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Mon Jan 2 13:01:37 2017  etrapani:I have a question relationship with errors in the commit log
Mon Jan 2 13:01:57 2017  etrapani:could someone help me with this?
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Mon Jan 2 16:36:04 2017  iksaif:aweisberg: I'm trying to understand why parkLoop() was written this way, and in particular while (timer - (now = System.nanoTime()) > nanos / 16);
Mon Jan 2 16:36:27 2017  iksaif:I think part of it is that parkNanos can be interrupted
Mon Jan 2 16:36:34 2017  iksaif:but that doesn't explain the /16
Mon Jan 2 16:38:59 2017  EdwardCapriolo:Are you looking at SEPWorker et all?
Mon Jan 2 16:39:09 2017  iksaif:CoalescinStrategies
Mon Jan 2 16:39:39 2017  iksaif:I know there is a first bug where we wait even if we managed to get the maximum items we were looking for
Mon Jan 2 16:39:53 2017  iksaif:I suspect that waiting also artifcially increase the gap between messages
Mon Jan 2 16:40:06 2017  iksaif:and I suspect that parkLoop() is doing more than it should
Mon Jan 2 16:40:59 2017  EdwardCapriolo:Ow fun :) If you figure it out add a comment. I have looked over CS and outboundTCPConnection and want to make some changes but it seems to have a 'black magic' feel around it
Mon Jan 2 16:42:50 2017  iksaif:I hope aweisberg can enlighten us
Mon Jan 2 16:43:17 2017  iksaif:what changes were you looking at ? I'm looking at CS because I found some contention on backlog.put() in OTC
Mon Jan 2 16:43:18 2017  EdwardCapriolo:I mean to say once it is found out maybe move it to a constant like SUSPECTED_NUMBER_OF_CORES=16 or something :)
Mon Jan 2 16:44:10 2017  iksaif:yeah I will, but I meant that Ariel wrote in this code in the first place :P
Mon Jan 2 16:44:13 2017  EdwardCapriolo:I was looking at a bug where assert is not trapped in outbound TCP connection. I was understanding the role of CS and when dropable verbs are dropped etc.
Mon Jan 2 16:44:47 2017  iksaif:but .. that might be similar to another thing that I've seen, sometime the OTC just stop sending anything
Mon Jan 2 16:44:53 2017  EdwardCapriolo:There is a really interesting goto in outbound TCP connection which makes the following the logic a bit janky for me
Mon Jan 2 16:46:32 2017  EdwardCapriolo:I was looking at: https://issues.apache.org/jira/browse/CASSANDRA-12633 . I was going to pitch a rather interesting refactor which removed the lable and would make things a bit more testable.
Mon Jan 2 16:51:13 2017  EdwardCapriolo:12633 was 'fixed' in that it catches throwables now. But the semantics of what happens to the other messages queued up etc are unclear to me.
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