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20140416

jboss 8 wildfly: AIO wasn't located on this platform, it will fall back to using pure Java NIO. If your platform is Linux, install LibAIO to enable the AIO journal

noticed this warning in my eclipse console when i started up jboss 8:

09:56:37,832 WARN  [org.jboss.as.messaging] (MSC service thread 1-8) JBAS011600: AIO wasn't located on this platform, it will fall back to using pure Java NIO. If your platform is Linux, install LibAIO to enable the AIO journal


the libaio-dev library made the warning go away (ubuntu 13.04--yeah, still haven't upgraded):
sudo apt-get install libaio-dev


NIO means New I/O:
"a collection of Java programming language APIs that offer features for intensive I/O operations"

but why would jboss want me to install linux libs instead of "pure Java NIO"?

"The Java NIO journal gives great performance, but If you are running HornetQ using Linux Kernel 2.6 or later, we highly recommend you use the AIO journal for the very best persistence performance."

http://hornetq.sourceforge.net/docs/hornetq-2.1.2.Final/user-manual/en/html/persistence.html#installing-aio


"Using the operating system's own asynchronous I/O provides the best possible performance and scalability."
(Exploiting HornetQ's Support of Linux's Native Asynchronous I/O)


see also Java.nio vs Java.io

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