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Sometimes ambari might throw the above alert which puts you in some confusion how all 50 DN's can be active and stale.

Firstly, I suggest you to go through this article from HCC and understand how to identify stale datanodes


Increase the value of the property from 30000(default) to 60000 milli seconds or 180000 milli seconds

dfs.namenode.stale.datanode.interval=60000 or 180000
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‎07-14-2017 10:51 PM
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