[
https://issues.apache.org/jira/browse/SSHD-854?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16664569#comment-16664569
]
Jonathan Valliere commented on SSHD-854:
----------------------------------------
One of the things I would look for in the heap dump is the Set/Maps belonging
to the Selector and see how many items are in there. That will tell us if the
SocketChannelImpl objects were actually closed because their SelectionKeyImpl
objects should no longer be in the Set/Maps.
When you said that all but a few of the IoSession were closed, how did you make
that determination?
> 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??
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
