Hi,   Added to the above email because if there are too many old files are available in the SHS folder the cleaner may not work as expected. So the ideal way to be delete manually if there are too old .inprogress files.   Thanks AKR ... View more

Go to ResourceManager UI on Ambari. Click nodes link on the left side of the window. It should show all Node Managers and the reason for it being listed as unhealthy. Mostly found reasons are regarding disk space threshold reached. In that case needs to consider following parameters Parameters Default value Description yarn.nodemanager.disk-health-checker.min-healthy-disks 0.25 The minimum fraction of number of disks to be healthy for the node manager to launch new containers. This correspond to both yarn.nodemanager.local-dirs and yarn.nodemanager.log-dirs. i.e. If there are less number of healthy local-dirs (or log-dirs) available, then new containers will not be launched on this node. yarn.nodemanager.disk-health-checker.max-disk-utilization-per-disk-percentage 90.0 The maximum percentage of disk space utilization allowed after which a disk is marked as bad. Values can range from 0.0 to 100.0. If the value is greater than or equal to 100, the nodemanager will check for full disk. This applies to yarn.nodemanager.local-dirs and yarn.nodemanager.log-dirs. yarn.nodemanager.disk-health-checker.min-free-space-per-disk-mb 0 The minimum space that must be available on a disk for it to be used. This applies to yarn.nodemanager.local-dirs and yarn.nodemanager.log-dirs. In the final step, if above steps do not reveal the actual problem , needs to check log , location path : /var/log/hadoop-yarn/yarn. ... View more