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Editorial Team
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Asked: 2026-05-21T01:58:55+00:00

In a REQ/REP socket, if the socket send a request to a dead (disconnected)

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In a REQ/REP socket, if the socket send a request to a dead (disconnected) node the message isn’t delivered and stays in a message queue occupying memory. How can one clean these undelivered messages (let’s say, messages that are in the queue for more than 1 minute)?

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1 Answer

  1. Editorial Team

    You might want to set the optional parameter ZMQ_LINGER:

    The ZMQ_LINGER option shall set the
    linger period for the specified
    socket. The linger period determines
    how long pending messages which have
    yet to be sent to a peer shall linger
    in memory after a socket is closed
    with zmq_close(3), and further affects
    the termination of the socket’s
    context with zmq_term(3).

    … for which a positive value will set a maximun time for message to be blocked in the queue.

    See
    http://api.zeromq.org/2-1-1:zmq-setsockopt

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