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https://issues.apache.org/jira/browse/CLOUDSTACK-9348?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15270724#comment-15270724
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ASF subversion and git services commented on CLOUDSTACK-9348:
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Commit 7ce0e10fbcd949375e43535aae168421ecdaa562 in cloudstack's branch
refs/heads/master from [~williamstev...@gmail.com]
[ https://git-wip-us.apache.org/repos/asf?p=cloudstack.git;h=7ce0e10 ]
Merge pull request #1493 from shapeblue/nio-fix
CLOUDSTACK-9348: Use non-blocking SSL handshake in NioConnection/Link- Uses
non-blocking socket config in NioClient and NioServer/NioConnection
- Scalable connectivity from agents and peer clustered-management server
- Removes blocking ssl handshake code with a non-blocking code
- Protects from denial-of-service issues that can degrade mgmt server
responsiveness
due to an aggressive/malicious client
- Uses separate executor services for handling connect/accept events
Changes are covered the NioTest so I did not write a new test, advise how we
can improve this. Further, I tried to invest time on writing a benchmark test
to reproduce a degraded server but could not write it deterministic-ally
(sometimes fails/passes but not always). Review, CI testing and feedback
requested /cc @swill @jburwell @DaanHoogland @wido @remibergsma
@rafaelweingartner @GabrielBrascher
* pr/1493:
CLOUDSTACK-9348: Use non-blocking SSL handshake
CLOUDSTACK-9348: Unit test to demonstrate denial of service attack
Signed-off-by: Will Stevens <williamstev...@gmail.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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