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https://issues.apache.org/jira/browse/PROTON-1791?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16399152#comment-16399152
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Andrew Stitcher commented on PROTON-1791:
-----------------------------------------
[~miha-plesko] I'm not 100% sure, but I think you are running into a
configuration of ActiveMQ designed to limit the number of clients that are
inactive and "hogging" a connection.
I don't think it's an issue with sending heartbeats, as all the clients should
be correctly honouring the negotiated heartbeat settings
> TCP sockets remain open in CLOSE_WAIT state
> -------------------------------------------
>
> Key: PROTON-1791
> URL: https://issues.apache.org/jira/browse/PROTON-1791
> Project: Qpid Proton
> Issue Type: Bug
> Components: ruby-binding
> Affects Versions: proton-c-0.21.0
> Environment: Confirmed on Ubuntu 16.04 and RHEL 7.4
> Confirmed on qpid_proton 0.19.0 and 0.21.0
> Reporter: Miha Plesko
> Assignee: Alan Conway
> Priority: Major
> Labels: bug
> Fix For: proton-c-0.22.0
>
> Attachments: idle-disconnect.png
>
>
> Hi guys,
> thanks for developing the awesome qpid_proton ruby gem, we're using it on
> daily basis!
> However, recently we noticed following error in our server log:
> Too many open files - socket(2) for "172.16.117.189" port 5672
> After some research it turns out that qpid_proton process is having
> increasingly
> more and more following file descriptors open:
> $ lsof -ap 108533
> ruby 108533 miha 116u IPv4 562438 0t0 TCP
> 172.16.117.189:53626->147.75.102.132:amqp (CLOSE_WAIT)
> ruby 108533 miha 197u IPv4 561644 0t0 TCP
> 172.16.117.189:53630->147.75.102.132:amqp (CLOSE_WAIT)
> ruby 108533 miha 311u IPv4 560657 0t0 TCP
> 172.16.117.189:53634->147.75.102.132:amqp (CLOSE_WAIT)
> ruby 108533 miha 549u IPv4 565342 0t0 TCP
> 172.16.117.189:53642->147.75.102.132:amqp (CLOSE_WAIT)
> ruby 108533 miha 576u IPv4 565122 0t0 TCP
> 172.16.117.189:53650->147.75.102.132:amqp (CLOSE_WAIT)
> ruby 108533 miha 603u IPv4 565738 0t0 TCP
> 172.16.117.189:53654->147.75.102.132:amqp (CLOSE_WAIT)
> ruby 108533 miha 630u IPv4 563021 0t0 TCP
> 172.16.117.189:53658->147.75.102.132:amqp (CLOSE_WAIT)
> ruby 108533 miha 657u IPv4 568361 0t0 TCP
> 172.16.117.189:53662->147.75.102.132:amqp (CLOSE_WAIT)
> ruby 108533 miha 666u IPv4 563027 0t0 TCP
> 172.16.117.189:53666->147.75.102.132:amqp (CLOSE_WAIT)
> ruby 108533 miha 675u IPv4 567538 0t0 TCP
> 172.16.117.189:53670->147.75.102.132:amqp (CLOSE_WAIT)
> ruby 108533 miha 684u IPv4 567998 0t0 TCP
> 172.16.117.189:53678->147.75.102.132:amqp (CLOSE_WAIT)
> ruby 108533 miha 690u IPv4 574709 0t0 TCP
> 172.16.117.189:53686->147.75.102.132:amqp (CLOSE_WAIT)
> ruby 108533 miha 693u IPv4 578725 0t0 TCP
> 172.16.117.189:53694->147.75.102.132:amqp (CLOSE_WAIT)
> ruby 108533 miha 696u IPv4 576840 0t0 TCP
> 172.16.117.189:53698->147.75.102.132:amqp (CLOSE_WAIT)
> ruby 108533 miha 699u IPv4 577819 0t0 TCP
> 172.16.117.189:53702->147.75.102.132:amqp (CLOSE_WAIT)
> ruby 108533 miha 702u IPv4 582192 0t0 TCP
> 172.16.117.189:53710->147.75.102.132:amqp (CLOSE_WAIT)
> ruby 108533 miha 705u IPv4 582861 0t0 TCP
> 172.16.117.189:53714->147.75.102.132:amqp (CLOSE_WAIT)
> ruby 108533 miha 708u IPv4 577363 0t0 TCP
> 172.16.117.189:53718->147.75.102.132:amqp (CLOSE_WAIT)
> ruby 108533 miha 711u IPv4 578175 0t0 TCP
> 172.16.117.189:53722->147.75.102.132:amqp (CLOSE_WAIT)
> ruby 108533 miha 714u IPv4 587172 0t0 TCP
> 172.16.117.189:53730->147.75.102.132:amqp (CLOSE_WAIT)
> ruby 108533 miha 717u IPv4 584387 0t0 TCP
> 172.16.117.189:53734->147.75.102.132:amqp (CLOSE_WAIT)
> ...
> I think the CLOSE_WAIT status of file descriptor indicates that the TCP
> connection has already been closed, but the file descriptor wasn't closed.
> After 9 hours or so there are enough of such file descriptors for OS to
> complain about it.
> We did all we could to close connections gracefully:
> connection.container.stop
> connection.close
> connection = nil
> but nothing seems to help. A simple but expensive workaround is to manually
> invoke Ruby's garbage collection,
> but ideally `connection.close` would close the file descriptor.
> May I kindly ask you to look at this?
> Thank you and Best Regards,
> Miha
> PS: The error occurs both on Ubuntu 16.04 and RHEL 7.4
> PS2: The error occurs both on qpid_proton 0.19.0 and 0.21.0
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