RE: [MINA] Troubleshooting under heavy load

[Oscar Herrera]

Hi Justin.

 

- By emtpy messages I mean the client receives them, but when it is parsing them appears the following exception: org.apache.mina.protocol.ProtocolViolationException: Invalid message termination character! (Hexdump: empty). Full stack is attached to this mail.

- No, actually is MINA 0.74

- Yes, I did, there's two choices as far as I understand, 1st connection gets lost, that seems not to be happening, never see that event on the load tester stack trace. Second flip the buffer, I'm doing so, and I think this couldn't be the cause because otherwise I wouldn't be receiving the other messages before that number of users.

 

Thank you so much in advance for your help,

 

Oscar Herrera

Developer

---

From: Trustin Lee [mailto:[EMAIL PROTECTED]
Sent: Sun 10/30/2005 9:25 PM
To: Apache Directory Developers List
Subject: Re: [MINA] Troubleshooting under heavy load

Hi,

2005/10/31, Oscar Herrera <[EMAIL PROTECTED]>:

I've been working on a game server, and the goal is to support 1000 users per server playing at the same time, server is coordinating all clients on remote machines. To be able to test the server on how many users it supports, we built a load tester using MINA also. So I use 5 computers getting connected to the same server using the load tester, each one simulates 200 users. Everything works fine until the server gets around 260 users connected at the same time, from than time ahead, server starts sending empty messages to the clients. My team and I have been trying to figure out what might be happening unsuccessfully so far.

 

Have anyone had an issue like this before using MINA?, any clue on what could be causing this strange behavior?

* What do you mean by an 'empty message'?
* Which version of MINA are you using?  I hope you're using 0.8.0.
* Did you check the FAQ?

Cheers,
Trustin

--
what we call human nature is actually human habit
--
http://gleamynode.net/

05-10-30 23:41:32 ERROR [LoadTesterListener:88] Exception caught
org.apache.mina.protocol.ProtocolViolationException: Invalid message termination
 character! (Hexdump: empty)
        at com.studiocom.galapagos.mina.MinaClientMessageDecoder.doDecode(MinaCl
ientMessageDecoder.java:51)
        at org.apache.mina.protocol.codec.CumulativeProtocolDecoder.decode(Cumul
ativeProtocolDecoder.java:104)
        at org.apache.mina.protocol.io.IoAdapter$SessionHandlerAdapter.dataRead(
IoAdapter.java:136)
        at org.apache.mina.io.AbstractIoFilterChain$2.dataRead(AbstractIoFilterC
hain.java:150)
        at org.apache.mina.io.AbstractIoFilterChain.callNextDataRead(AbstractIoF
ilterChain.java:366)
        at org.apache.mina.io.AbstractIoFilterChain.access$1000(AbstractIoFilter
Chain.java:51)
        at org.apache.mina.io.AbstractIoFilterChain$Entry$1.dataRead(AbstractIoF
ilterChain.java:525)
        at org.apache.mina.io.AbstractIoFilterChain$1.dataRead(AbstractIoFilterC
hain.java:100)
        at org.apache.mina.io.AbstractIoFilterChain.callNextDataRead(AbstractIoF
ilterChain.java:366)
        at org.apache.mina.io.AbstractIoFilterChain.dataRead(AbstractIoFilterCha
in.java:357)
        at org.apache.mina.io.IoSessionManagerFilterChain$1.dataRead(IoSessionMa
nagerFilterChain.java:78)
        at org.apache.mina.io.AbstractIoFilterChain.callNextDataRead(AbstractIoF
ilterChain.java:366)
        at org.apache.mina.io.AbstractIoFilterChain.access$1000(AbstractIoFilter
Chain.java:51)
        at org.apache.mina.io.AbstractIoFilterChain$Entry$1.dataRead(AbstractIoF
ilterChain.java:525)
        at org.apache.mina.io.filter.IoThreadPoolFilter.processEvent(IoThreadPoo
lFilter.java:107)
        at org.apache.mina.util.BaseThreadPool$Worker.processEvents(BaseThreadPo
ol.java:393)
        at org.apache.mina.util.BaseThreadPool$Worker.run(BaseThreadPool.java:33
3)