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Scalawags #19
Archived series ("HTTP Redirect" status)
Replaced by: scalawags.tv
When? This feed was archived on December 02, 2017 16:21 (). Last successful fetch was on August 17, 2017 14:32 ()
Why? HTTP Redirect status. The feed permanently redirected to another series.
What now? If you were subscribed to this series when it was replaced, you will now be subscribed to the replacement series. This series will no longer be checked for updates. If you believe this to be in error, please check if the publisher's feed link below is valid and contact support to request the feed be restored or if you have any other concerns about this.
Manage episode 60658009 series 60604
Scalawags, not the podcast you come to for facts
Scalawags, the podcast that brings the Internet to its knees with double-digit live-viewing numbers!
with special guest Viktor Klang, man of Akka
youtube: https://www.youtube.com/watch?v=x9IxmgJNLbg
Intro (0:00)- Viktor loses up here what he gains down there
- the rapture came and only Daniel was chosen
- Akka is a big deal
- it's five years old
- Jonas Bonér started it...
- ...but Viktor made the first pull request
- Lift was the matchmaker
- revealed: contents of that first PR!!
- on GitHub, Akka started the day after Node.JS started
- main inspiration: Erlang
- money quote: "concurrency is just a specialization of distributed computing"
- Akka vs. Scala-standard-library actors
- Akka resembles Erlang less?
- why the rewrite for 2.0?
- supervision!
- actor systems
- proper classloader handling
- internal architectural issues
- Akka HTTP is what used to be Spray
- but fused with Akka Streams
- and providing a Java API
- note it's not actually released yet
- preview announcement: https://typesafe.com/blog/akka-http-preview
- HTTP "gateway" or "shim" to actors
- Akka HTTP vs. Finagle
- COBOL on Cogs, Akka on Airplanes
- messages are just Any. will this change? how do you type actors?
- actors and the active object design pattern
- the first Akka had typed actors, using AOP
- later Viktor rewrote it to use JDK proxies
- but, performance penalty
- Roland Kuhn has used macros to type messages and responses
- issues: thread-safety of reflection? performance? Java interop?
- research on typed actors at EPFL?
- Marlow and Wadler's paper on typing Erlang:
- recent discussions on using marker interfaces to associate message types with actors
- Josh: perhaps actors will stay untyped but we'll build higher-level typed APIs over top of them
- for example, Akka Streams
- analogy with type erasure in the VM itself?
- nominal typing leads to chicken-or-egg problems with serialization and class loaders
- Tim Perrett wants some compare-and-contrast on this
- Dick has struggled with scalaz-stream's handling of large files
- so e.g. https://github.com/scalaz/scalaz-stream/issues/51 and https://github.com/scalaz/scalaz-stream/issues/136, with prospective fixes happening on https://github.com/scalaz/scalaz-stream/tree/lazy
- scalaz-stream runs on tasks, Akka Streams uses actors
- how is resource cleanup handled?
- Viktor disclaims expertise on scalaz-stream, and says it's "too early" to compare
- for now the Akka Streams API is intentionally small
- an early major concern is proper support for backpressure
- asynchronous, non-blocking backpressure
- "every stream X will have at most N items in flight"
- listener question about what problem spaces streams address and how supervision of stream actors works
- mining bitcoins with Akka on Raspberry Pi?!
- is Akka Streams usable from Java?
- are Akka Streams usable from Java?
- yes. does that constrain the design?
- what proportion of Akka users are using it from Java?
- a lot. could even be 50/50
- "the best way of gaining traction [...] for any technology, is to be open, and not to be judgmental"
- Akka for Python?
- https://github.com/jodal/pykka is Akka-inspired
- something similar for .NET exists?
- what are the implications of Java 8 for Akka?
- Dick: how do you stay in touch with what users want?
- culture!
- putting a high priority on documentation and helping newcomers
- treat root causes, not just symptoms
- user question: what about security if some nodes are untrusted?
- no man is an island, but actors are
- JMX is roundly made fun of
- stack traces >> core dumps
- async "stack traces" at the JVM level? want.
- Viktor's thoughts on life, the universe, and everything
- what is the optimum thread pool size of an unladen African swallow?
- are actors people?
- moving past Akka's notorious TerminatedChildrenDungeon scandal
- behind "the one who walks the bubbles of space-time"
- aka the Flying Spaghetti Actor
- Captain Deadlock Dreadlock
- try Akka! you have the power.
41 episodes
Archived series ("HTTP Redirect" status)
Replaced by: scalawags.tv
When? This feed was archived on December 02, 2017 16:21 (). Last successful fetch was on August 17, 2017 14:32 ()
Why? HTTP Redirect status. The feed permanently redirected to another series.
What now? If you were subscribed to this series when it was replaced, you will now be subscribed to the replacement series. This series will no longer be checked for updates. If you believe this to be in error, please check if the publisher's feed link below is valid and contact support to request the feed be restored or if you have any other concerns about this.
Manage episode 60658009 series 60604
Scalawags, not the podcast you come to for facts
Scalawags, the podcast that brings the Internet to its knees with double-digit live-viewing numbers!
with special guest Viktor Klang, man of Akka
youtube: https://www.youtube.com/watch?v=x9IxmgJNLbg
Intro (0:00)- Viktor loses up here what he gains down there
- the rapture came and only Daniel was chosen
- Akka is a big deal
- it's five years old
- Jonas Bonér started it...
- ...but Viktor made the first pull request
- Lift was the matchmaker
- revealed: contents of that first PR!!
- on GitHub, Akka started the day after Node.JS started
- main inspiration: Erlang
- money quote: "concurrency is just a specialization of distributed computing"
- Akka vs. Scala-standard-library actors
- Akka resembles Erlang less?
- why the rewrite for 2.0?
- supervision!
- actor systems
- proper classloader handling
- internal architectural issues
- Akka HTTP is what used to be Spray
- but fused with Akka Streams
- and providing a Java API
- note it's not actually released yet
- preview announcement: https://typesafe.com/blog/akka-http-preview
- HTTP "gateway" or "shim" to actors
- Akka HTTP vs. Finagle
- COBOL on Cogs, Akka on Airplanes
- messages are just Any. will this change? how do you type actors?
- actors and the active object design pattern
- the first Akka had typed actors, using AOP
- later Viktor rewrote it to use JDK proxies
- but, performance penalty
- Roland Kuhn has used macros to type messages and responses
- issues: thread-safety of reflection? performance? Java interop?
- research on typed actors at EPFL?
- Marlow and Wadler's paper on typing Erlang:
- recent discussions on using marker interfaces to associate message types with actors
- Josh: perhaps actors will stay untyped but we'll build higher-level typed APIs over top of them
- for example, Akka Streams
- analogy with type erasure in the VM itself?
- nominal typing leads to chicken-or-egg problems with serialization and class loaders
- Tim Perrett wants some compare-and-contrast on this
- Dick has struggled with scalaz-stream's handling of large files
- so e.g. https://github.com/scalaz/scalaz-stream/issues/51 and https://github.com/scalaz/scalaz-stream/issues/136, with prospective fixes happening on https://github.com/scalaz/scalaz-stream/tree/lazy
- scalaz-stream runs on tasks, Akka Streams uses actors
- how is resource cleanup handled?
- Viktor disclaims expertise on scalaz-stream, and says it's "too early" to compare
- for now the Akka Streams API is intentionally small
- an early major concern is proper support for backpressure
- asynchronous, non-blocking backpressure
- "every stream X will have at most N items in flight"
- listener question about what problem spaces streams address and how supervision of stream actors works
- mining bitcoins with Akka on Raspberry Pi?!
- is Akka Streams usable from Java?
- are Akka Streams usable from Java?
- yes. does that constrain the design?
- what proportion of Akka users are using it from Java?
- a lot. could even be 50/50
- "the best way of gaining traction [...] for any technology, is to be open, and not to be judgmental"
- Akka for Python?
- https://github.com/jodal/pykka is Akka-inspired
- something similar for .NET exists?
- what are the implications of Java 8 for Akka?
- Dick: how do you stay in touch with what users want?
- culture!
- putting a high priority on documentation and helping newcomers
- treat root causes, not just symptoms
- user question: what about security if some nodes are untrusted?
- no man is an island, but actors are
- JMX is roundly made fun of
- stack traces >> core dumps
- async "stack traces" at the JVM level? want.
- Viktor's thoughts on life, the universe, and everything
- what is the optimum thread pool size of an unladen African swallow?
- are actors people?
- moving past Akka's notorious TerminatedChildrenDungeon scandal
- behind "the one who walks the bubbles of space-time"
- aka the Flying Spaghetti Actor
- Captain Deadlock Dreadlock
- try Akka! you have the power.
41 episodes
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