The error `Heartbeat exception: Failed to send heart beat to active proxy" will be thrown randomly.

[Eugene-Mark]

Version: wip_spark_rpmp branch

Describe the bug The error in title is thrown in both proxy server, standby proxy server and data server after launching for an idle time.

To Reproduce

• Launch proxy
• Launch standby proxy
• Launch data server

Expected Behavior All services stay healthy all the time.

[Eugene-Mark]

Fixed by https://github.com/Intel-bigdata/Spark-PMoF/commit/84990651dee9d163705609ed817a369826e47fc5.