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From "Alan Conway (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DISPATCH-571) Driver spins when a listener accepts a socket while FDs are all in use
Date Thu, 01 Jun 2017 18:10:04 GMT

    [ https://issues.apache.org/jira/browse/DISPATCH-571?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16033419#comment-16033419
] 

Alan Conway commented on DISPATCH-571:
--------------------------------------

This can be solved without a time out if we handle the ENFILE/EMFILE errors properly in the
proactor (PROTON-1495). The router should reject connections as long as it has no FDs and
resume normal operation when some existing FDs are closed.

> Driver spins when a listener accepts a socket while FDs are all in use
> ----------------------------------------------------------------------
>
>                 Key: DISPATCH-571
>                 URL: https://issues.apache.org/jira/browse/DISPATCH-571
>             Project: Qpid Dispatch
>          Issue Type: Bug
>          Components: Container
>            Reporter: Ted Ross
>            Assignee: Alan Conway
>             Fix For: 1.0.0
>
>
> when operating as a server and using listeners, if the number of open FDs is equal to
the limit on FDs, accept will return an error and the driver will spin at 100% cpu until an
FD is freed up for the incoming connection.
> Suggested fix:
> If "accept" returns a "too many open files" error (ENFILE or EMFILE), the listening socket
should be taken out of the read-fds for a time (say one second) before retrying.
> If this is not practical to do in Proton, the driver should provide hooks for the encapsulating
application to use to provide this holdoff.



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