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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-829) Seperate the datanode contents that is written to the fsimage vs the contents used in over-the-wire communication
Date Fri, 15 Dec 2006 05:11:21 GMT
Seperate the datanode contents that is written to the fsimage vs the contents used in over-the-wire
communication
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                 Key: HADOOP-829
                 URL: http://issues.apache.org/jira/browse/HADOOP-829
             Project: Hadoop
          Issue Type: Bug
          Components: dfs
            Reporter: dhruba borthakur
         Assigned To: dhruba borthakur


In the existing implementation, the Namenode has a data structure called DatanodeDescriptor.
It is used to serialize contents of the Datanode while writing it to the fsimage. The same
serialization method is used to send a Datanode object to the Datanode and/or the Client.
This introduces the shortcoming that one cannot introduce non-persistent fields in the DatanodeDescriptor.

One solution is to seperate out the following two functionality into two seperate classes:
1. The fields from a Datanode that are part of the ClientProtocol and/or DatanodeProcotol.
2. The fields from a Datanode that are stored in the fsImage.

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