The most common way for a client to interact with a Hadoop cluster is through RPC. A
client connects to a NameNode over RPC protocol to read or write a file. RPC
connections in Hadoop use the Java Simple Authentication and Security Layer (SASL) which
supports encryption. When the hadoop.rpc.protection property is set
to privacy, the data over RPC is encrypted with symmetric keys. Please refer to
Hortonworks' blog for more details on the hadoop.rpc.protection
setting.
![[Note]](../common/images/admon/note.png) | Note |
|---|---|
RPC encryption covers not only the channel between a client and a Hadoop cluster but also the inter-cluster communication among Hadoop services. |
