Request Information on Java NIO

["이희승 (Trustin Lee)"]

Some JDK versions in AIX block SelectionKey.interestOps(int) calls while
Selector.select() is running.  Most recent JDKs doesn't block and
therefore it is possible to involve less locking.  Netty auto-detects
the JDK vendors and versions to determine if
SelectionKey.interestOps(int) blocks or not.  Old version of Netty
didn't detect old AIX JDK versions correctly, and that was why you
needed to specify the contraintLevel manually.  However, the latest
Netty version should work fine without the manual configuration.

HTH

Aniruddh Munoli wrote:
> Hi Trustin,
>  
> First of all, let me thank you for enabling me to resolve a
> serious issue with my Java application on AIX. The application worked
> perfectly fine on Linux and Solaris; however, when I moved it to AIX, it
> started crashing every now and then. Your message posted at
> http://lists.jboss.org/pipermail/netty-dev/2009-July/000936.html
> addressed a similar issue and the workaround mentioned there did the
> trick in my case too. However, considering my almost zero experience
> with Java NIO, I'm not able to understand what exactly was the issue and
> how did NIO constraint level of 2 resolve it. I would appreciate if you
> can throw some light in this regard? Apologies for any inconvenience caused.
>  
> Following is some information on the system I used.
>  
> 
> *uname -a*
> 
> AIX SVHJ0941 1 6 00F619A24C00
> 
>  
> 
> *oslevel -s*
> 6100-04-03-1009
>  
> *java -version*
>    java version "1.5.0"
>    Java(TM) 2 Runtime Environment, Standard Edition (build
> pap64dev-20100813 (SR12 FP1 ))
>    IBM J9 VM (build 2.3, J2RE 1.5.0 IBM J9 2.3 AIX ppc64-64
> j9vmap6423-20100808 (JIT enabled)
>    J9VM - 20100629_60535_BHdSMr
>    JIT  - 20100623_16197_r8
>    GC   - 20100211_AA)
>    JCL  - 20100813
>  
> Please let me know if you need further details.
>  
> The successive message at
> http://lists.jboss.org/pipermail/netty-dev/2009-July/000948.html
> indicates that the proper fix has been issued for JDK 1.6 (it's not
> tried yet; upgrading Java is not an option at this moment). Has that fix
> been pushed down to JDK 1.5 too? 
>  
> Thanks & Regards,
> Aniruddh
> 

-- 
Trustin Lee - http://gleamynode.net/


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