Improvement of sleep in loop

[o0lwj0o]

Hi, I found an interesting case in this project.
It has “Thread.sleep()” in a “while(true)” loop. I found some discussion in Stackoverflow and other website. It can be refactored by using a executor service.
https://ejrh.wordpress.com/2012/07/13/sleeping-in-loops-considered-harmful/
https://stackoverflow.com/questions/3535754/netbeans-java-new-hint-thread-sleep-called-in-loop
or
Maybe use CountDownLatch.await to automatically awake and shutdown.

Detailed websites and lines:
286 | https://github.com/yahoo/storm-yarn/blob/master/src/main/java/com/yahoo/storm/yarn/StormOnYarn.java
160 | https://github.com/yacy/yacy_grid_mcp/blob/development/src/main/java/net/yacy/grid/mcp/Service.java
37 | https://github.com/yacy/yacy_grid_mcp/blob/development/src/main/java/net/yacy/grid/mcp/Caretaker.java

Best regards