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From "Fabio Soares (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DIRMINA-1055) High cpu load on messageReceived after null message
Date Wed, 23 Nov 2016 12:37:59 GMT
Fabio Soares created DIRMINA-1055:
-------------------------------------

             Summary: High cpu load on messageReceived after null message
                 Key: DIRMINA-1055
                 URL: https://issues.apache.org/jira/browse/DIRMINA-1055
             Project: MINA
          Issue Type: Bug
    Affects Versions: 2.0.16
         Environment: Ubuntu 16.04 LTS
4.4.0-28-generic #47-Ubuntu SMP Fri Jun 24 10:09:13 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
java version "1.8.0_91"
Java(TM) SE Runtime Environment (build 1.8.0_91-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.91-b14, mixed mode)
            Reporter: Fabio Soares


Here is the code where I initialize the Acceptor

{code:java}
  private NioDatagramAcceptor startUdpAcceptor(Antenna source) throws Exception {
    NioDatagramAcceptor acceptor = new NioDatagramAcceptor();
    initAcceptor(acceptor, source);
    return acceptor;
  }

  private void initAcceptor(IoAcceptor acceptor, Antenna antenna) throws Exception {
    acceptor.getFilterChain().addLast("codec", new ProtocolCodecFilter(new TextLineCodecFactory()));
    FormatHandler handler = FormatHandlerFactory.getFormatHandler(antenna);
    acceptor.setHandler(handler);
    acceptor.bind(new InetSocketAddress(antenna.getRawPort()));
  }
{code}

My format handler just extends IoHandlerAdapter and overrides some of the other methods to
log information's. 

On my method _public void messageReceived(IoSession session, Object message)_ I have the following:

{code:java}
@Override
public void messageReceived(IoSession session, Object message) {
    //Sometimes happens that the message at this point is null
    if (message == null) {
         logger.error("Error on Antenna: " + this.source.getName() + " (ID:" + this.source.getId()
+ "): Message is null");
         return;
    }
    ... just process the message
}
{code}

On my _public void exceptionCaught(IoSession session, Throwable cause)_ 
I just close the session

Sometimes it happens that this session somehow gets locked, my log only shows an error message
as in a loop and the server load spikes. All the other sessions (around 1200 sessions) are
still working on background as the data keeps flowing but certain other threats stop responding.
There's a thread running calling an API checking there are new session that need to be created
or stopped and once it gets looked this api call stops happening.

I've had this happening for a few hours and it generated a 45GB log file each hour just with
this message:
{panel}
2016-11-23 07:10:22,913 ERROR [NioDatagramAcceptor-441] com.vesseltracker.ais_proxy.logic.formatHandlers.NMEAFormatHandler:
Error on Antenna: ChinaSource (ID:2405): Message is null
{panel}

Closing the session doesn't stop the problem.

This error only stops when we restart the process and it only dies when we use kill -5 or
-9
Before we were using Ubuntu 12 and Mina 2.0.7 and we didn't have this problem. It started
when we upgraded the server and software running on it

After the update we started by using mina 2.0.13 and it has followed all the new updates.


The funny thing is that this only happens with 3 UDP connections coming from China (not simultaneously)
and after the restart it works normally

Its running on:
Mina 2.0.16
Ubuntu 16.04 LTS
4.4.0-28-generic #47-Ubuntu SMP Fri Jun 24 10:09:13 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
java version "1.8.0_91"
Java(TM) SE Runtime Environment (build 1.8.0_91-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.91-b14, mixed mode)

And the server:
Intel® Xeon® Processor E5-2650 v4 2,2 GHz, 12-Core
128GB DDR4-2133 RAM
500GB DC S3500 Series SSD

I would like to provide more infos but I don't know what you guys would need so please let
me know and I will try to get those infos



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