If a data node/all data nodes is a cluster has the above warning and the warning has gone to critical for less than 10% space, would cloudera manager then prevent any futher processing/applications from running on the cluster/datanodes?
Cloudera Manager won't prevent running anything, but nevertheless applications can fail due to lack of free space. It's best to add new DataNodes to the cluster if you can.
thanks for your reply.
Do the applications use the critical limit as a marker for when they should not run?
we have created some space and the applications have began to run again,
No, no application that I know of interfaces with CM to influence it's behavior. however you can get some really weird behavior from any application that uses the "non-hdfs" space on the cluster if any one node fills up and you have not reserved any space for non-hdfs using
Map/Reduce, and by extension, hive and any other program that uses map/reduce requires non-hdfs space for intermediate data.