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lightbend / kalix-jvm-sdk

Java and Scala SDKs for Kalix
https://docs.kalix.io/java/index.html
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Document tuning thread pool for blocking service logic #1077

Open johanandren opened 2 years ago

johanandren commented 2 years ago

In the default config of a jvm-sdk app we use the default dispatcher as internal dispatcher to optimize for low resource usage, if a user writes a very blocking application this means it is quite easy to starve the entire Kalix node (I think that is what is going on in https://discuss.kalix.io/t/multiple-requests-at-the-same-time-multi-threading-concern/106/9 which does a Thread.sleep(6000) and cannot observe parallel request processing)

We should have a section in the JVM SDK docs talking about how the default config is for non-blocking and showing how to tune the dispatcher for blocking logic through config.

johanandren commented 2 years ago

Or if we can provide some more safe default config which conserves resources but can still handle blocking by forking more threads when needed?