Kerberos is used to authenticate user or service principal to grant access to
cluster. It doesn't encrypt data blocks coming in and out of cluster.
Sent from Yahoo Mail on Android
On Wed, Apr 6, 2016 at 4:36 PM, Lin Zhao<[email protected]> wrote: 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.
<property>
<name>dfs.encrypt.data.transfer</name>
<value>true</value>
</property><property>
<name>hadoop.rpc.protection</name>
<value>privacy</value>
</property>
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 at /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? Any help is
appreciated.Thanks,Lin Zhao
