Robert Kanter created OOZIE-2104:
------------------------------------

             Summary: oozie server dies on startup if oozie-site redefines 
ActionExecutor classes
                 Key: OOZIE-2104
                 URL: https://issues.apache.org/jira/browse/OOZIE-2104
             Project: Oozie
          Issue Type: Bug
    Affects Versions: trunk
            Reporter: Robert Kanter
            Assignee: Robert Kanter
            Priority: Blocker


OOZIE-1890 moved everything out of oozie-site; this includes the ActionExecutor 
config properties ({{oozie.service.ActionService.executor.classes}} and 
{{oozie.service.ActionService.executor.ext.classes}}).

Because these were previously defined in ooze-site, if the user re-uses their 
oozie-site after upgrading to an version of Oozie with OOZIE-1890, then Oozie 
will die on startup with:
{noformat}
2014-12-29 20:15:04,077 FATAL Services:514 - SERVER[p0106.sjc.cloudera.com] 
E0150: Actionexecutor type already registered [email]
org.apache.oozie.service.ServiceException: E0150: Actionexecutor type already 
registered [email]
        at 
org.apache.oozie.service.ActionService.register(ActionService.java:92)
        at 
org.apache.oozie.service.ActionService.registerExecutors(ActionService.java:72)
        at org.apache.oozie.service.ActionService.init(ActionService.java:66)
        at 
org.apache.oozie.service.Services.setServiceInternal(Services.java:386)
        at org.apache.oozie.service.Services.setService(Services.java:372)
        at org.apache.oozie.service.Services.loadServices(Services.java:305)
        at org.apache.oozie.service.Services.init(Services.java:213)
        at 
org.apache.oozie.servlet.ServicesLoader.contextInitialized(ServicesLoader.java:46)
        at 
org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4210)
        at 
org.apache.catalina.core.StandardContext.start(StandardContext.java:4709)
...
...
        at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
        at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
2014-12-29 20:15:04,126  INFO Services:520 - SERVER[p0106.sjc.cloudera.com] 
Shutdown
{noformat}

The problem is that Oozie currently doesn't allow an ActionExecutor type to be 
redefined once defined.  We should change this so that Oozie uses whichever is 
defined last (doesn't matter if it's redefined as the same or different 
implementation).  This will also allow the ext property to override the regular 
property.




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