Copying Data between a Secure and an Insecure Cluster using DistCp and webHDFS

You can use DistCp and webHDFS to copy data between a secure cluster and an insecure cluster by doing the following:
  1. Set ipc.client.fallback-to-simple-auth-allowed to true in core-site.xml on the secure cluster side: 
    <property> 
  <name>ipc.client.fallback-to-simple-auth-allowed</name>
  <value>true</value> 
</property>
  2. Use commands such as the following from the secure cluster side only: 
    distcp webhdfs://insecureCluster webhdfs://secureCluster 
distcp webhdfs://secureCluster webhdfs://insecureCluster