question: public String generateInstanceId ( ) throws SchedulerException { String property = System . getProperty ( getSystemPropertyName ( ) ) ; if ( property == null ) { throw new SchedulerException ( "No value for '" + SYSTEM_PROPERTY + "' system property found, please configure your environment accordingly!" ) ; } if ( getPrepend ( ) != null ) property = getPrepend ( ) + property ; if ( getPostpend ( ) != null ) property = property + getPostpend ( ) ; return property ; }
target:  Returns the cluster wide value for this scheduler instance's id, based on a system property