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https://issues.apache.org/jira/browse/HTTPCORE-127?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12546011
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Oleg Kalnichevski commented on HTTPCORE-127:
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Asankha,
It is a very common problem people usually have with NIO. One cannot register
new channels with the selector when it is busy selecting I/O events. The usual
way of going about the problem is to queue new channels [1] using a queuing
mechanism of some sort and then to register channels with the selector when it
unblocks from selecting I/O events [2]
[1]
http://jakarta.apache.org/httpcomponents/httpcomponents-core/httpcore-nio/xref/org/apache/http/impl/nio/reactor/AbstractIOReactor.html#100
[2]
http://jakarta.apache.org/httpcomponents/httpcomponents-core/httpcore-nio/xref/org/apache/http/impl/nio/reactor/AbstractIOReactor.html#147
The fact that DefaultListeningIOReactor does not employ a queuing mechanism for
new channels is likely to be a bug, which we need to fix.
Oleg
> Expose improved API for lifecycle management
> --------------------------------------------
>
> Key: HTTPCORE-127
> URL: https://issues.apache.org/jira/browse/HTTPCORE-127
> Project: HttpComponents Core
> Issue Type: Improvement
> Components: HttpCore NIO
> Affects Versions: 4.0-alpha6
> Reporter: Asankha C. Perera
> Fix For: 4.0-beta1
>
>
> Apache Synapse uses HttpCore and we would like to stop accepting new
> connections to put our servers into a "maintenance" mode. In this mode any
> in-flight requests already being served will continue as normal (i.e.
> reading, writing etc) but new connections should be rejected, so that a load
> balancer could direct new connections to another instance in the cluster. The
> requirement is to then update configuration, apply patches or cleanly
> shutdown etc. for maintenance without effecting any in-flight requests.
> Implementation wise I think this would be fairly straightforward as we can
> remove OP_ACCEPT from the interested ops.
> On the mailing list Odi suggested that we tackle this at a broader level by
> exposing lifecycle management APIs
> "I suggest create, start, stop, destroy methods in some classes/APIs
> (semantics of JBoss Service MBeans)"
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