Datanode denied communication with namenode

In a Cloudera cluster we had a few nodes reporting the following error message in the logs under

hadoop-cmf-hdfs-DATANODE-whatever.com.log.out

The error included:

Datanode denied communication with namenode because the host is not in the include-list: : DatanodeRegistration

One solution could be to ‘Refresh Node List’ as shown in the screenshot below. Find it by clicking on the Clusters > HDFS and then click on ‘NameNode’ in the ‘Status Summary’. After that choose ‘Refresh Node List’ under the ‘Actions’ menu. YMMV

 

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