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From "Todd Lipcon (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-2521) Remove custom checksum headers from data transfer protocol
Date Mon, 31 Oct 2011 20:15:32 GMT
Remove custom checksum headers from data transfer protocol
----------------------------------------------------------

                 Key: HDFS-2521
                 URL: https://issues.apache.org/jira/browse/HDFS-2521
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: data-node, hdfs client
    Affects Versions: 0.23.0
            Reporter: Todd Lipcon
            Assignee: Todd Lipcon


Most of the data transfer protocol has been converted over to protobufs, but we still send
the checksum header with ad-hoc serialization in a few places. This is self-inconsistent and
also makes wire protocol compatibility more difficult. This JIRA does the following:
- introduce a new protobuf message to describe a checksum
- include the "requested checksum" with the block operation (instead of coming separately
after it)
- include the "required checksum" with the block operation response, for write operations
(instead of coming first in the BlockSender stream)

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