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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CLOUDSTACK-9348) CloudStack Server degrades when a lot of connections on port 8250
Date Wed, 11 May 2016 14:21:12 GMT

    [ https://issues.apache.org/jira/browse/CLOUDSTACK-9348?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15280188#comment-15280188
] 

ASF GitHub Bot commented on CLOUDSTACK-9348:
--------------------------------------------

Github user kiwiflyer commented on the pull request:

    https://github.com/apache/cloudstack/pull/1493#issuecomment-218473890
  
    @rhtyd We're still seeing some odd behaviour related to the agent with this PR (and PR1534)
applied to 2 of our hardware labs. What we're seeing is 100% cpu on the agent (KVM). There's
nothing obvious in the debug logs indicating a problem. I've tried it both behind haproxy
and directly to the management server and we see the same symptoms. Let me know what we can
provide to help in terms of debugging.


> CloudStack Server degrades when a lot of connections on port 8250
> -----------------------------------------------------------------
>
>                 Key: CLOUDSTACK-9348
>                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-9348
>             Project: CloudStack
>          Issue Type: Bug
>      Security Level: Public(Anyone can view this level - this is the default.) 
>            Reporter: Rohit Yadav
>            Assignee: Rohit Yadav
>             Fix For: 4.9.0
>
>
> An intermittent issue was found with a large CloudStack deployment, where servers could
not keep agents connected on port 8250.
> All connections are handled by accept() in NioConnection:
> https://github.com/apache/cloudstack/blob/master/utils/src/main/java/com/cloud/utils/nio/NioConnection.java#L125
> A new connection is handled by accept() which does blocking SSL handshake. A good fix
would be to make this non-blocking and handle expensive tasks in separate threads/pool. This
way the main IO loop won't be blocked and can continue to serve other agents/clients.



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