all about swift slogging distributed log system
download here ( word file ) http://wiki.openstack.org/development/swift/slogging?action=AttachFile&do=get&target=slogging+document
plugin development document here (word file): http://wiki.openstack.org/development/swift/slogging?action=AttachFile&do=get&target=sloggingplugindevelpment.doc