Add ServiceOperations class to aid working with Services
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Key: MAPREDUCE-3970
URL: https://issues.apache.org/jira/browse/MAPREDUCE-3970
Project: Hadoop Map/Reduce
Issue Type: Sub-task
Components: mrv2
Affects Versions: 0.23.1, 0.24.0
Reporter: Steve Loughran
Assignee: Steve Loughran
Add Helper methods to move things through lifecycles. init->start is common,
stop-if-service!=null another. Some static methods can execute these, and even
call stop() if init() raises an exception. These could go into a class
ServiceOps in the same package. These can be used by those services that wrap
other services, and help manage more robust shutdowns.
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