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Posted to hdfs-dev@hadoop.apache.org by "Todd Lipcon (Created) (JIRA)" <ji...@apache.org> on 2011/10/31 21:15:32 UTC

[jira] [Created] (HDFS-2521) Remove custom checksum headers from data transfer protocol

Remove custom checksum headers from data transfer protocol
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                 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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