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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-1578) First step towards data transter protocol compatibility: support DatanodeProtocol#getDataTransferProtocolVersion
Date Tue, 11 Jan 2011 18:11:45 GMT
First step towards data transter protocol compatibility: support DatanodeProtocol#getDataTransferProtocolVersion
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                 Key: HDFS-1578
                 URL: https://issues.apache.org/jira/browse/HDFS-1578
             Project: Hadoop HDFS
          Issue Type: New Feature
            Reporter: Hairong Kuang
            Assignee: Hairong Kuang
             Fix For: 0.23.0


HADOOP-6904 allows us to handle RPC changes in a compatible way. However, we have one more
protocol to take care of, the data transfer protocol, which a dfs client uses to read data
from or write data to a datanode.
 
My proposal is to add a new RPC getDataTransferVersion to DatanodeProtocol that returns the
data transfer protocol version running on the datanode. A dfs client gets the datanode's version
number before it reads from/writes to a datanode. With this, the dfs client could behave differently
according to datanode's data transfer version. This provides a base for us to make data transfer
protocol changes in a compatible way.

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