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From "Emmanuel Lecharny (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (DIRMINA-1042) Epoll spinning causes memory leak
Date Thu, 25 Aug 2016 14:05:21 GMT

     [ https://issues.apache.org/jira/browse/DIRMINA-1042?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Emmanuel Lecharny resolved DIRMINA-1042.
----------------------------------------
       Resolution: Fixed
    Fix Version/s: 2.0.14

The loop was way too rigid, creating a new Selector whenever the {{select()}} was returning
0 with a delta of 0. That would lead to some heavy CPU usage.

Giving a chance for the loop to retry a few times solve this issue : most of the time, retrying
a select immediately simply work. Now, we try up to 10 times before bailing out and creating
a new Selector

> Epoll spinning causes memory leak
> ---------------------------------
>
>                 Key: DIRMINA-1042
>                 URL: https://issues.apache.org/jira/browse/DIRMINA-1042
>             Project: MINA
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 2.0.13
>         Environment: Linux 2.6.18-409.el5 
>            Reporter: Eric Lapierre
>             Fix For: 2.0.14
>
>         Attachments: Screen Shot 2016-08-16 at 11.02.14 AM.png
>
>
> We get a lot of occurrences of this message : "Create a new selector. Selected is 0,
delta = 0"
> accompanied with a memory leak.  The SelectionKeyImpl in the fdToKey HashMap of the EPollSelectorImpl
don't get remove.
> I suspect that the registerNewSelector() method in the org.apache.mina.transport.socket.nio.NioProcessor
class should cancel the key.



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