[ http://issues.apache.org/jira/browse/HADOOP-829?page=all ]

dhruba borthakur updated HADOOP-829:
------------------------------------

    Attachment: datanodeserialize1.patch

the previous path file was bad because it did not have full path names.

> Separate the datanode contents that is written to the fsimage vs the contents 
> used in over-the-wire communication
> -----------------------------------------------------------------------------------------------------------------
>
>                 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
>         Attachments: datanodeserialize1.patch
>
>
> 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 separate out the following two functionality into two 
> separate 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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