This is helpful when running several pieces of work one after the other on a single H2O cluster and you want to make a notation in the H2O server side log where one piece of work ends and the next piece of work begins.
h2o.logAndEcho(message)
A character string with the message to write to the log.
h2o.logAndEcho
sends a message to H2O for logging. Generally used for debugging purposes.