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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