Launch distcp

Authenticate using kinit on the client and then launch the distcp job.

Consider the following example:

hadoop distcp hdfs://xyz01.dev.example.com:8020/user/alice hdfs://abc01.qa.example.com:8020/user/alice

If launching distcp fails, force Kerberos to use TCP instead of UDP by adding the following parameter to the krb5.conf file on the client:

[libdefaults]
udp_preference_limit = 1