About yarn.nodemanager.log-aggregation.roll-monitoring-interval-seconds, there are three log messages corresponding to the value set to this parameter, but all of them are shown with the WARN level.
(a) disabled (default)
2016-01-05 22:19:29,062 WARN org.apache.hadoop.yarn.server.nodemanager.containermanager.logaggreg ation.AppLogAggregatorImpl: rollingMonitorInterval is set as -1. The log rolling mornitoring interval is disabled. The logs will be aggregated after this application is finished.
2016-01-06 00:41:15,808 WARN org.apache.hadoop.yarn.server.nodemanager.containermanager.logaggregation.AppLogAggregatorImpl: rollingMonitorInterval is set as 7200. The logs will be aggregated every 7200 seconds
(c) enabled but wrong configuration
2016-01-06 00:39:50,820 WARN org.apache.hadoop.yarn.server.nodemanager.containermanager.logaggregation.AppLogAggregatorImpl: rollingMonitorIntervall should be more than or equal to 3600 seconds. Using 3600 seconds instead.
I think it is better to output with WARN only in case (c), but it is ok to output with INFO in case (a) and (b).