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https://issues.apache.org/jira/browse/CLOUDSTACK-9348?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15358686#comment-15358686
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ASF GitHub Bot commented on CLOUDSTACK-9348:
--------------------------------------------
GitHub user rhtyd opened a pull request:
https://github.com/apache/cloudstack/pull/1601
CLOUDSTACK-9348: Reduce Nio selector wait time
This reduced the Nio loop selector wait time, this way the selector will
check frequently (as much as 100ms per iteration) and handle any pending
connection/tasks. This would make reconnections very quick at the expense of
some CPU usage.
/cc @swill @kiwiflyer guys can you please apply this fix in your env and
test if you're still able to produce any Nio related error b/w mgmt server(s)
and kvm agent(s) not being able to connect quickly. Please also watch out for
any increased CPU usage (there should not be any significant change), in which
case we may increase the timeout from 100ms to 200-400ms.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/shapeblue/cloudstack nio-aggressive-selector
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/cloudstack/pull/1601.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #1601
----
commit 0381b7ea185ef753873594216a67b8d376e3d658
Author: Rohit Yadav <rohit.ya...@shapeblue.com>
Date: 2016-07-01T09:02:58Z
CLOUDSTACK-9348: Reduce Nio selector wait time
This reduced the Nio loop selector wait time, this way the selector will
check frequently (as much as 100ms per iteration) and handle any pending
connection/tasks. This would make reconnections very quick at the expense of
some CPU usage.
Signed-off-by: Rohit Yadav <rohit.ya...@shapeblue.com>
----
> 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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