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From "Emmanuel Lecharny (JIRA)" <j...@apache.org>
Subject [jira] [Closed] (DIRMINA-884) Apache Mina byte buffer shrink affecting badly
Date Mon, 09 Jul 2012 20:03:35 GMT

     [ https://issues.apache.org/jira/browse/DIRMINA-884?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Emmanuel Lecharny closed DIRMINA-884.

    Resolution: Cannot Reproduce

Unless we get some code that demonstrate the issue, it's extremely difficult to find what
is the problem.
> Apache Mina byte buffer shrink affecting badly
> ----------------------------------------------
>                 Key: DIRMINA-884
>                 URL: https://issues.apache.org/jira/browse/DIRMINA-884
>             Project: MINA
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 2.0.2
>         Environment: Linux, Cent OS
>            Reporter: Kasun Dilunika
>            Priority: Critical
> I have developed server application to process charging messages which are coming in
> binary format. In this application I have used mina core libraries to develop the server
> following the state machine pattern.
> In my scenario, when client initiated a connection for the first time, it is not closed.
> Client maintains the connection with server by sending some echo messages periodically.
> This echo message is 24 bytes in size.When a message hits server first time, it always
> allocates a byte buffer with 30000 bytes and read the content in to the byte buffer.
> Every 30 seconds echo message comes to the server. Mina framework watches this behavior
> and starts to reduce the buffer in to a half. [30000 -> 15000 -> 7500 -> 3750
??-> 58].
> And it remains in the size 58 as the incoming message is 24 bytes long.
> But the problem is starting when the actual message is received, which is 704 bytes
> long. As the server buffer is allocated only to 58 bytes, it only reads first 58 bytes
> from the message. After that only framework realize that this buffer is not enough and
> starting to double the byte buffer. But the time is too late to react, because decoder
> state machine reject the message as it is not tallying with the size stated in its
> header.
> So, is there a way to stop this optimization to this message, because I can?t go with
> this logic when it is considered the logic I am having?
> If there is a configuration to stop this please let me know, otherwise tell me where
> should I modify the source code in order to stop this optimization.

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