Critical Description
PROBLEM: Ambari should give recommendations on this setting: dfs.datanode.du.reserved
The default is 1GB and that is too low for a lot of our production customers. If this is too low and the space on the datanode fills up, the nodemanagers will start failing the health checks and we get into a bad state with not enough nodemanagers being up. At this point the admin tries to run the balancer and hope that it will balance very quickly.
There should be a recommendation on this value based on the disk space available in the datanode volume. In addition, if the user sets it too low there should be a warning saying this will cause problems if enough buffer is not kept.
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