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From "Trustin Lee (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (DIRMINA-320) Unexpected OutOfMemoryError exception in SocketConnectorIoProcessor
Date Wed, 13 Dec 2006 07:43:22 GMT
     [ http://issues.apache.org/jira/browse/DIRMINA-320?page=all ]

Trustin Lee resolved DIRMINA-320.
---------------------------------

    Resolution: Invalid
      Assignee: Trustin Lee

According to the log message you gave us, the OutOfMemoryError occurred in the I/O worker
thread rather than your business logic.  We cannot simply conclude that the session the I/O
worker was trying to flush is really the root cause of the OutOfMemoryError.  Other session
might have allocated huge memory block and other session might be being affected by its side-effect.
 Therefore, you shouldn't rely solely on exceptionCaught() event.  Please try to set idle
time and close the session when there's no communication with the remote peer.

> Unexpected OutOfMemoryError exception in SocketConnectorIoProcessor
> -------------------------------------------------------------------
>
>                 Key: DIRMINA-320
>                 URL: http://issues.apache.org/jira/browse/DIRMINA-320
>             Project: MINA
>          Issue Type: Bug
>          Components: Transport
>    Affects Versions: 1.0
>         Environment: Mac OS X, Java 1.5.0_06
>            Reporter: Matthew Phillips
>         Assigned To: Trustin Lee
>
> I'm not totally sure that this is a bug, but it's certainly a problem in that the error
is partially hidden by being sent to the logger and not the exceptionCaught() method and seems
to leave MINA in an unusable state.
> The scenario is that I'm running some memory load tests by having a client fire lots
of large messages at a server, and I occasionally see the sort of exception below appear on
the client's console (the client is also MINA-based). It appears the heap is being blown and
not being handled very gracefully. The client that sees this happen does not shut down cleanly,
possibly because it's no longer able to send/receive the messages needed by my protocol to
close the session.
> The main problem is that the client has no idea this has happened and cannot take any
action, it just fails ungracefully.
> 10822 [SocketConnectorIoProcessor-2.0] WARN org.apache.mina.common.support.DefaultExceptionMonitor
- Unexpected exception.
> java.lang.OutOfMemoryError: Direct buffer memory
> 	at java.nio.Bits.reserveMemory(Bits.java:633)
> 	at java.nio.DirectByteBuffer.<init>(DirectByteBuffer.java:95)
> 	at java.nio.ByteBuffer.allocateDirect(ByteBuffer.java:288)
> 	at sun.nio.ch.Util.getTemporaryDirectBuffer(Util.java:56)
> 	at sun.nio.ch.IOUtil.write(IOUtil.java:69)
> 	at sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:302)
> 	at org.apache.mina.transport.socket.nio.SocketIoProcessor.doFlush(SocketIoProcessor.java:482)
> 	at org.apache.mina.transport.socket.nio.SocketIoProcessor.doFlush(SocketIoProcessor.java:414)
> 	at org.apache.mina.transport.socket.nio.SocketIoProcessor.access$600(SocketIoProcessor.java:44)
> 	at org.apache.mina.transport.socket.nio.SocketIoProcessor$Worker.run(SocketIoProcessor.java:567)
> 	at org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:43)
> 	at java.lang.Thread.run(Thread.java:613)

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