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Scala actors can block on TcpService if socket connection to a specific destination blocks #5734

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scabug opened this issue May 2, 2012 · 5 comments
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@scabug scabug commented May 2, 2012

In the attached file, the ForkJoinPool-worker 4 thread has locked the TcpService and is trying to establish a connection (which, for whatever reason), is blocking. This means that no other remote communication can occur - in particular ForkJoinPool-1-Worker-0 is blocked on sending a response to a separate actor.

This essentially takes down an entire actor-based system.

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@scabug scabug commented May 2, 2012

Imported From: https://issues.scala-lang.org/browse/SI-5734?orig=1
Reporter: @oxbowlakes
Affected Versions: 2.9.2, 2.10.1
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@scabug scabug commented May 2, 2012

@oxbowlakes said:
This may be related to another issue I reported: #4942

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@scabug scabug commented Jun 11, 2012

@adriaanm said:
Philipp, please re-assign if this is out of scope for you.

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@scabug scabug commented Apr 29, 2013

Martin McNulty (mhmcnulty) said:
Workaround for this bug: scala/scala#2468

Allows setting of the timeout to use when making Socket connections, which should alleviate the problem, if not entirely eliminate it.

@scabug scabug closed this Nov 21, 2013
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@scabug scabug commented Nov 21, 2013

@retronym said:
Closing based on Martin's patch. Scala actors are deprecated in favour of Akka actors, so we don't plan to refine this any further.

@scabug scabug added this to the 2.10.2 milestone Apr 7, 2017
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