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From "Todd Lipcon (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-2521) Remove custom checksum headers from data transfer protocol
Date Mon, 31 Oct 2011 22:11:32 GMT

     [ https://issues.apache.org/jira/browse/HDFS-2521?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon updated HDFS-2521:
------------------------------

    Status: Patch Available  (was: Open)
    
> 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
>         Attachments: hdfs-2521-on-2512.txt, hdfs-2521.txt
>
>
> 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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