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hadoop security
There is DelegationToken in hadoop2. What is the role of  DelegationToken
and how to use the DelegationToken ?

Thanks,

LiuLei
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB