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This is a journaller and dejournaller written in java for the Lightweight event system. You will need to install maven 2.x in order to build: % mvn clean package To build a release: % mvn --batch-mode release:prepare release:perform Running To start the journaller: % bin/lwes-journaller -m <multicast_addr> -p <multicast_port> -f <filename> To stop the journaller: NOTE: To stop this journaller, you can't just control-c it or kill -9 it. If you do that, the Java shutdown hook may not catch the signal and the file won't get closed properly. Use the lwes-journaller-stop script or use kill -15. % bin/lwes-journaller-stop To tell the journaller to rotate the log file (you will probably want a cron job for this): % bin/lwes-rotate-log -m <multicast_addr> -p <multicast_port> If you are getting bad throughput as far as number of events per second you can process before you see loss, make sure your operating system udp buffer is set to a reasonable number: Linux sysctl -w net.core.rmem_max=8388608 Solaris ndd -set /dev/udp udp_max_buf 8388608 FreeBSD, Darwin sysctl -w kern.ipc.maxsockbuf=8388608 AIX no -o sb_max=8388608 You can also increase the read buffer on the multicast socket by setting the lwes specific system property MulticastReceiveBufferSize. For example, java -DMulticastReceiveBufferSize=8388608 ... There is a dejournaller utility to view the contents of the files. To run this: % java -jar dejournaller-[version].jar -f <file_name> [-g] It will output events one per line so you can grep/awk/perl them.