Datanode changes to track block token secret per namenode.
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Key: HDFS-1673
URL: https://issues.apache.org/jira/browse/HDFS-1673
Project: Hadoop HDFS
Issue Type: Sub-task
Components: data-node, name-node
Affects Versions: Federation Branch
Reporter: Suresh Srinivas
Assignee: Suresh Srinivas
Fix For: Federation Branch
Datanode currently keeps track of a single block token secret. Given datanode
talks to multiple namenodes, it needs to track it per namenode
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