I've been trying to secure block data transferred by HDFS. I added below to hdfs-site.xml and core-site xml to the data node and name node and restart both.
When I try to put a file from the hdfs command line shell, the operation fails with "connection is reset" and I see following from the datanode log:
"org.apache.hadoop.hdfs.server.datanode.DataNode: Failed to read expected encryption handshake from client a /172.31.36.56:48271. Perhaps the client is running an older version of Hadoop which does not support encryption"
I am able to reproduce this on two different deployments. I was following https://hadoop.apache.org/docs/r2.7.2/hadoop-project-dist/hadoop-common/SecureMode.html#Authentication , but didn't turn on kerberos authentication. No authentication works in my environment. Can this be the reason the handshake fails?