Namenode does not need to store any data node info persistently.
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Key: HADOOP-993
URL: https://issues.apache.org/jira/browse/HADOOP-993
Project: Hadoop
Issue Type: Improvement
Reporter: Raghu Angadi
Assigned To: Sameer Paranjpye
Namenode does not need to serialize datanode info. It will map datanode to
storageID when datanode register.
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