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From "Emmanuel Lecharny (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DIRMINA-668) Modify the way we use IoProcessors
Date Fri, 04 Dec 2009 10:20:20 GMT

    [ https://issues.apache.org/jira/browse/DIRMINA-668?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12785852#action_12785852

Emmanuel Lecharny commented on DIRMINA-668:

AFAIR, when a new message arrives, as it is associated with a session, it's beng processed
by a IoProcessor. As an IoProcessor also holds the selector, we can't process more than one
message at a time in a single IoProcessor (hopefully, we have more than one IoProcessor).
So if the message is costly to process (ie, yu access a database in the middle), in a loaded
system, messages can be blocked a long time before being processed, waiing for the crrent
message to be completed.

This is what I meant. Hope it's clearer.

> Modify the way we use IoProcessors
> ----------------------------------
>                 Key: DIRMINA-668
>                 URL: https://issues.apache.org/jira/browse/DIRMINA-668
>             Project: MINA
>          Issue Type: Improvement
>    Affects Versions: 2.0.0-M4
>            Reporter: Emmanuel Lecharny
>             Fix For: 3.0.0-M1
> In the current code base, when accepting new connections, we pick a processor and register
the news connection within the internal selector. In other words, we have as many selectors
as we have IoProcessors.
> This is a potential problem if some request cost a lot to be executed, as every requests
waiting on this IoProcessor will be blocked.
> It would be way better to use a single selector which dispatches requests to an Executor,
as we will always have available threads ready to process the requests (unless the pool is
saturated, but then we have a bigger issue ...)

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