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From "Kasun Dilunika (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DIRMINA-884) Apache Mina byte buffer shrink affecting badly
Date Mon, 30 Jan 2012 02:13:10 GMT
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 a
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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