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https://issues.apache.org/jira/browse/SSHD-854?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16675138#comment-16675138
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Emmanuel Lecharny commented on SSHD-854:
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I do think the {{implDereg}} method removes the {{SelectionKey}} from the
{{fdToKey}} method. I haven't followed the code to the point this method get
called, but I seriously doubt it's not called at some point when a {{Selector}}
is being called. If it's not called, then it's a serious bug in the {{NIO}}
implementation.
> Massive object graph in NioSocketSession
> ----------------------------------------
>
> Key: SSHD-854
> URL: https://issues.apache.org/jira/browse/SSHD-854
> Project: MINA SSHD
> Issue Type: Bug
> Reporter: jpalacios
> Priority: Major
>
> I'm looking at a heap dump from one of our customers where the retained heap
> size for some {{NioSocketSession}} instances is almost 1GB.
> From the looks of the dump MINA has created a massive object graph where:
> {code}
> NioSocketSession -> SelectionKeyImpl -> EpollSelectorImpl -> HashMap ->
> SelectionKeyImpl -> NioSocketSession -> ...
> {code}
> From the looks of the obeject IDs these are not loops
> Each individual object is not large by itself but at the top of the graph the
> accumulated retained size is enough to produce an OOME
> Could you help me understand how MINA can produce such a massive object
> graph? Should MINA apply any defense mechanism to prevent this??
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