Today, Hudson writes in a log a username of a person who started the build.
But it doesn't write who stopped it, it's only according to exception thrown we understand someone stopped the job:

Caused by: java.nio.channels.ClosedByInterruptException
	at java.nio.channels.spi.AbstractInterruptibleChannel.end(AbstractInterruptibleChannel.java:184)
	at sun.nio.ch.FileChannelImpl.size(FileChannelImpl.java:314)

It would be very nice to log the username of a person who stopped the job