Changes between Initial Version and Version 1 of Old/omf-4.4/NodeHandler/LogS

Timestamp:

Feb 27, 2006, 2:14:06 AM (18 years ago)

Author:

seskar

Comment:

—

Old/omf-4.4/NodeHandler/LogS

@@ +1 @@
+The nodehandler uses four different levels of logging messages:
+
+* '''DEBUG''': 
+Those are logging messages about various internal state changes which
+are mainly useful for the developers of nodehandler or for more in-depth
+analysis of what's going on. They should be of little use for the casual
+experimenter
+
+* '''INFO''': 
+Those logging messages report state changes which we deemed useful to
+report to the experimenter. An info message does NOT report anything
+abnormal. Info messages, as the name implies inform the experimenter that
+the experiment is progressing and should be considered POSITIVE feedback.
+
+* '''WARNING''': 
+Warning messages report abnormal behavior but it is still possible
+for the nodehandler to proceed. It is left to the experimenter to decide if
+it makes sense to proceed or if the experiment should be stopped. Warning
+messages usually originate from the nodes. There are mechanisms which would
+allow an experiment script to react to those messages and potentially take
+corrective actions. Right now, those mechanisms aren't fully developed and
+therefore not properly documented.
+
+* '''ERROR''': 
+Error messages report unexpected behaviors by the nodehandler or some
+of its sub system. The progress of the experiment is undetermined. An error
+message usually results from an unprocessed exception.
+
+In short DEBUG and INFO are logging normal progress and can be ignored, WARN
+and ERROR report on abnormal behavior.
+