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IRC log for #virtualJUG, 2015-09-23

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Time S Nick Message
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14:55 Auad Hello there
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15:48 shelajev hello people!
15:48 shelajev so glad to see you all here
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15:49 mynickname is the streaming started?
15:49 shelajev nope, I expect it to start in 10ish minutes
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15:54 shelajev virtualjug.com/#live
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15:55 sjmaple hello hello :)
15:56 aztect joined #virtualJUG
15:56 sjmaple we'll be getting underway in just under 5 mins
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15:58 tushar Hi all
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15:58 sjmaple hey tushar
15:58 sjmaple wlcome :)
15:58 tushar :)
15:58 tushar how are you?
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16:01 DougLy howdy,
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16:01 yshthdn Greetings
16:02 Madfish hi There
16:02 sjmaple all ready to get started!
16:02 sjmaple let me click go :)
16:02 yshthdn oh yes
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16:03 sjmaple can everyone see us?
16:03 yshthdn yes
16:03 MarsYang yes
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16:03 monksy yep
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16:04 DougLy clear 4 me
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16:04 monksy btw thank you for using IRC for the chat functionality... that way I can use xchat to connect to the channel
16:04 sjmaple great! :)
16:04 sjmaple yw, monksy :)
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16:07 monksy virtualJUG is case sensitive
16:07 monksy for the channel name
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16:08 monksy do you support 4k resolution yet?
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16:09 DougLy tell Oleg is doing great. He seems nervous :-)
16:09 millrossjez we can see :)
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16:10 sjmaple he's not nervous, that's his typical Estonian swagger :)
16:10 Dentharg Yes, we do.
16:10 Dentharg Yes, we do see screen.
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16:10 sjmaple monksy: good point, monksy - I'll make a point of mentioning that next time
16:10 sjmaple and no, no 4k res yet :)
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16:13 DougLy does anybody know how long this would go? Ihave a meeting around 10AM here in Seattle
16:13 DijitalMunky Usually they are around an hour
16:14 DijitalMunky (sometimes longer, but they are available after they are down as well)
16:14 DijitalMunky *done
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16:15 sjmaple yep, what DijitalMunky  said :)
16:16 DijitalMunky ;)
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16:18 monksy unrelated note: AWS is having issues with N Virgina with dynomodb
16:18 INeedMySpace FF
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16:20 DougLy aws issue again? or is it old news from the weekend?
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16:23 daincredibleholg Well, make it two :)
16:23 firefoxNX 3
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16:23 millrossjez 7
16:23 millrossjez (sorry, I'm not very good with shared state)
16:23 sjmaple lol
16:23 daincredibleholg LOL -nice one
16:24 edmac firefoxNX,  do you work with Niagara AX?
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16:32 edmac is anybody here?
16:32 tushar yes
16:33 DijitalMunky I am here in electron form only....
16:33 DijitalMunky In fact most of my electrons have been lovingly recycled
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16:34 sjmaple any questions so far from anyone?
16:34 sjmaple pls put them in here
16:34 sjmaple as well as comments or anything else (relevant ;) )
16:35 edmac so far,  I'm finding the topic to be over my head...
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16:35 DougLy he forgot to shutdown the thread pool
16:35 DougLy hehe
16:35 sjmaple :D
16:36 sjmaple edmac: it is recorded, so it's good to watch ones like this a couple of times
16:37 El Sorry I have to go, could you send the link to see this session later, please
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16:41 firefoxNX slight off topic - do Reactive Java libraries use executors or fork-join?
16:42 tushar he is explaining using java-8
16:42 tushar so i dont have exposure to java-8
16:42 tushar :(
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16:43 DougLy I am in java 9 already :-)
16:43 DijitalMunky :P
16:43 Dentharg Btw. casting vjug session to a TV is great for code readability on the slides ;)
16:44 sjmaple firefoxNX: good question... I'll ask
16:44 sjmaple I saw Byte Buddy supports Java 9 already :)
16:44 firefoxNX i just searched rxjava repo on github... uses executor
16:44 sjmaple we should ask anyway, to put Oleg on the spot ;)
16:45 Dentharg Java 9? Damn, I'm sitting on 6 as the project mgmt does not want to upg.
16:45 Brettster eol?
16:45 millrossjez surely 6 is EOL
16:45 DijitalMunky @dentharg welcome to the club....we have a ton of that as well, because the business people are afraid that something is going to break...
16:45 daquino85 on 6 as well but we're preparing for a big upgrade to 8
16:46 marowid if project management chooses your technology it's time to change your job
16:46 DijitalMunky 6 has been eol for a few years now
16:46 Zelexis yep
16:46 ettoremaiorana eheheheh
16:46 millrossjez yep you're still online Oleg
16:46 Zelexis enjoying all the info
16:46 tushar You are right.. I have an interview next week
16:46 sjmaple 7 is eol too
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16:46 sjmaple but it all depends on stack products
16:47 Dentharg Even google uses 6 for Android.. Not everything from 7 is supported afaik
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16:47 daquino85 even the new ART runtime doesn't fully support 7?
16:48 daquino85 i know dalvik is still 6
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16:48 Dentharg Try with resources is not supported on Android 5 if I'm not mistaken
16:49 Dentharg No lambdas
16:49 DijitalMunky :(
16:49 sjmaple if you're using a product, like WebSphere, which runs on the IBM JDK, the support for WebSphere extends the JDK support to the term of the WAS support, if longer
16:50 sjmaple If you then get a stack product on top of WAS. Portal or commerce, it will again extend the support of the JDK to the term of portal/commerce
16:50 sjmaple what's not supported any longer in Java 7 is purely the public updates, i.e. just JDK updates without products
16:51 sjmaple I'm pretty sure the same model is used by Oracle
16:52 DijitalMunky ROFL
16:53 DijitalMunky (at Les Iterables)
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16:54 sjmaple such a great image
16:54 DijitalMunky Aye!'
16:56 Dentharg AYE = alternative yes equivalent? ;)
16:56 DijitalMunky Nice!
16:56 daquino85 well played
16:56 DijitalMunky and yes
16:58 firefoxNX link pls? :)
16:58 ettoremaiorana what's the risk for an actor system to deadlock?
16:58 sjmaple the vJUG session Oleg refers to is http://virtualjug.com/resilience-is-by-design/
16:58 sjmaple :)
16:58 daquino85 is there a github repo with the code examples somewhere that we can try executing using each of the different models?
16:58 ettoremaiorana I mean, how easy is it to screw up using a bad actor graph?
16:58 sjmaple good questions, I'll ask after fibers
16:59 sjmaple actually, I think that's the last model he's looking at
16:59 savor_flavor So actors allow you to scale over multiple JVMs. He does not mention this?
16:59 firefoxNX actors work across JVMs?
17:00 firefoxNX fibers sounds like magic
17:00 DijitalMunky Sounds like string theory to me!
17:00 DijitalMunky LOL
17:01 lutzh @firefoxNX passing messages works across JVMs, so it doesn't matter if the actor you talk to is on the same JVM or elsewhere.
17:01 savor_flavor Didnt understand fibers. The presentation should be condensed at the beginning to leave time for the interesting stuff at the end.
17:01 marius_filip Question for Oleg: how scalable are fibers given that there is no efficient way to swap thread stacks?
17:02 DijitalMunky @lutz, as long as the messages are Serializable though, right?
17:02 kedi are fibers akin to generator functions /aysnc-await  kind of thing?
17:02 marius_filip No efficient way to swap thread stacks in the JVM. The only method to do it I've seen is based on copying the stack in place, but that doesn't scale for very deep stacks (thousands of frames, recoursive functions)
17:02 lutzh @etorremaiorana what do you mean with screw up actor graph? The actor graph would be the actor hierarchy and would express the supervision, but not the message flow.
17:03 firefoxNX @lutzh so do actors use something similar to JMS to achieve this?
17:03 lutzh You don't get "traditional" deadlocks because there's no shared state. A deadlock would be actors that each wait for a message from another.
17:03 ettoremaiorana i don't think there's always a hierarchy father->child, you can easily build any kind of graph if you want.
17:03 ettoremaiorana ... I guess...
17:04 lutzh @firefoxNX no, it's much more lightweight, it just uses queues and if remote it will serialize your messages (and then de-serialize and queue on the other end).
17:04 Dentharg Is there any fibers session?
17:05 firefoxNX awesome thanks @lutzh
17:05 lutzh @ettoremaiorana Well actually there is, every actor has a parent... so I thought that's what you meant..
17:05 DijitalMunky Yes, thanks @lutzh
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17:05 millrossjez a session on fibers (eg quasar) would be awesome
17:05 lutzh But you mean just visualizing the message flow as a graph?
17:05 marius_filip @simon: did you get my question, Simon? Or I am speaking to the wrong channel?
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17:05 sjmaple yep, just waiting for Oleg to finish
17:05 DougLy thanks for the meetup and presentation!
17:06 sjmaple then I'll attack him with questions :)
17:06 DougLy very goo
17:06 marius_filip @simon: ok. thx
17:06 DougLy good
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17:07 ettoremaiorana @lutzh Ok, I'm not massively familiar with akka itself, I thought akka behaved like any other message passing systems: two actors producing onto each other can fill the queue up and result in deadlock
17:07 ettoremaiorana Apologies if I'm talking nonsense
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17:08 millrossjez generally actors don't end up waiting for a message from another specific actor (unless you make their state machine depend on it)
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17:09 savor_flavor Thanks for the book references. Look great. (when will I ever find time ti read all these great things!)
17:09 geoL Thanks
17:09 millrossjez but even so it shouldn't result in 2 blocked threads, more that if somehow each is expecting a message from the other, that particular piece of work will end up in a dead end effectively
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17:10 millrossjez (think i've explained that rather badly, sorry)
17:10 Dionisio Any advice in the order to read the books?
17:10 millrossjez great presentation Oleg :)
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17:10 ettoremaiorana Thanks Oleg
17:11 ettoremaiorana ettore maiorana
17:11 MarsYang great session , thanks.
17:13 miluch "can actor be statefull ?"
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17:14 savor_flavor I'm a she, but of course Simon couldn't guess.
17:14 pathfinder2104 when will be the recording available? I missed the starting and I just joined
17:14 ettoremaiorana thank you guys
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17:19 marius_filip @simon: depth of the stack is the issue. Can you please re-ask about deep stacks?
17:19 marius_filip Resulted from recursive functions, for ex.
17:19 marius_filip OK, thx.
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17:20 marius_filip Many thanks!
17:20 Kiran Thanks Oleg
17:20 millrossjez thanks Oleg
17:20 Zelexis Thanks Oleg ...learned a lot
17:21 alkoepam Thanks Oleg, great talk
17:21 slawek thanks Oleg, great session
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17:22 kedi sure, no issues, i was more of comparing it with what ES6/ES7 is coming up with
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17:22 marius_filip Excellent vJUC, thanks for Oleg, Simon & RebelLabs
17:22 pathfinder2104 Thanks Oleg & Simon
17:22 sjmaple thanks everyone!
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17:22 kedi Thanks Oleg and simon for the session
17:23 sjmaple pathfinder2104:  replay here https://www.youtube.com/watch?v=UoKebad9UOk
17:23 pathfinder2104 Thanks mate :)
17:23 sjmaple thanks for watching! http://meetup.com/virtualjug to sign up or RSVP to future events
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17:24 pathfinder2104 Bye
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17:27 shelajev @miluch, actors can be stateful
17:27 shelajev and they can have local state they can and should modify and they can choose what messages to handle and in which way based on that local state
17:27 shelajev it's just because they communicate through messages they don
17:28 shelajev *don't use shared mutable state that much
17:28 shelajev and that simplifies things a lot
17:28 shelajev okay, see you all online! Thanks for tuning in! ping me @shelajev if a need arises
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