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Published 20 hours ago • verified publisher icon zeromq

IllegalStateException: errno 4

Open mleegwt opened this issue 6 years ago • 4 comments

When closing the ZContext I'm receiving the quite unclear message errno 4. What does it mean?

The stacktrace: java.lang.IllegalStateException: errno 4 at zmq.Ctx.terminate(Ctx.java:272) at org.zeromq.ZMQ$Context.term(ZMQ.java:627) at org.zeromq.ZContext.destroy(ZContext.java:116) at org.zeromq.ZContext.close(ZContext.java:348) at .... my code .....

Using: JeroMQ 0.5.1 and Java OpenJDK 11.0.3. This occurs occasionally on windows and linux in our integration tests. These tests open and close many contexts in succession.

mleegwt avatar Jun 06 '19 15:06 mleegwt

I believe it might mean the channel was closed: see this commit https://github.com/zeromq/jeromq/pull/652/commits/8b647d5da05063aa80971e4fa64ea054bdf72456

When i close the socket, i get this exception in the thread that is pending on recv(). Therefore the proper action may be to stop your receiver thread.

This was changed somewhere between 0.3.6 and 0.5.1: i think in 0.3.6, on that event, i got some exception having getCause() instanceof java.nio.channels.ClosedChannelException

Getting this org.zeromq.ZMQException: Errno 4 (zmq.ZError.EINTR) looks similar to receiving from a socket and getting an InterruptedException in java because the socket got closed.

dcaillia avatar Nov 13 '19 13:11 dcaillia

Open question: Can we improve the error message?

daveyarwood avatar Apr 21 '20 22:04 daveyarwood

This Enum: https://github.com/zeromq/jeromq/blob/master/src/main/java/org/zeromq/ZMQ.java#L429 needs more messages to be implemented. Are they available in libzmq ?

fbacchella avatar Apr 22 '20 07:04 fbacchella

Revisiting this issue with 0.5.2 (which is in use for some time). The results are the same. Today I noticed something new on STD out: java.util.ConcurrentModificationException at java.base/java.util.HashMap$HashIterator.nextNode(HashMap.java:1493) at java.base/java.util.HashMap$KeyIterator.next(HashMap.java:1516) at zmq.SocketBase.processTerm(SocketBase.java:993) at zmq.Own.terminate(Own.java:180) at zmq.SocketBase.startReaping(SocketBase.java:898) at zmq.Reaper.processReap(Reaper.java:100) at zmq.ZObject.processCommand(ZObject.java:107) at zmq.Command.process(Command.java:75) at zmq.Reaper.inEvent(Reaper.java:79) at zmq.poll.Poller.run(Poller.java:273) at java.base/java.lang.Thread.run(Thread.java:834)

Things I would like:

  • The concurrent modification as the cause exception in the IllegalStateException (from the description).
  • No longer reporting the stacktrace on STD out.
  • An improved error message.
  • Improved shutdown handling in case of multithreading.

Any of the above feasible?

mleegwt avatar Dec 01 '20 12:12 mleegwt