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:
  2. Use commands such as the following from the secure cluster side only:
    distcp webhdfs://insecureCluster webhdfs://secureCluster 
    distcp webhdfs://secureCluster webhdfs://insecureCluster