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From "Konstantin Shvachko (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2983) Relax the build version check to permit rolling upgrades within a release
Date Thu, 12 Apr 2012 07:43:44 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2983?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13252271#comment-13252271
] 

Konstantin Shvachko commented on HDFS-2983:
-------------------------------------------

To clarify my point for the record.
_From the time a snapshot is started (NN -upgrade) and until it is completed by -finalize
or -rollback no DataNodes with different build versions are allowed on the cluster._
[Todd's comment|https://issues.apache.org/jira/browse/HDFS-2983?focusedCommentId=13250954#comment-13250954]
captures it technically.
                
> Relax the build version check to permit rolling upgrades within a release
> -------------------------------------------------------------------------
>
>                 Key: HDFS-2983
>                 URL: https://issues.apache.org/jira/browse/HDFS-2983
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>    Affects Versions: 2.0.0
>            Reporter: Eli Collins
>            Assignee: Aaron T. Myers
>             Fix For: 2.0.0
>
>         Attachments: HDFS-2983.patch, HDFS-2983.patch, HDFS-2983.patch, HDFS-2983.patch,
HDFS-2983.patch, HDFS-2983.patch, HDFS-2983.patch, HDFS-2983.patch
>
>
> Currently the version check for DN/NN communication is strict (it checks the exact svn
revision or git hash, Storage#getBuildVersion calls VersionInfo#getRevision), which prevents
rolling upgrades across any releases. Once we have the PB-base RPC in place (coming soon to
branch-23) we'll have the necessary pieces in place to loosen this restriction, though perhaps
it takes another 23 minor release or so before we're ready to commit to making the minor versions
compatible.

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