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Date: Sat, 7 Apr 2012 02:01:18 +0000 (UTC)
From: "Sanjay Radia (Commented) (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-2983) Relax the build version check to
 permit rolling upgrades within a release
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    [ https://issues.apache.org/jira/browse/HDFS-2983?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13249127#comment-13249127 ] 

Sanjay Radia commented on HDFS-2983:
------------------------------------

Most operations will not know when to take the snapshot. Hence there must conditions under which the system forces an upgrade snapshot. Any layout version should force a snapshot. Perhaps a minor version also forces a snapshot.
Perhaps each version of HDFS specifies if a snapshot is required from the previous.
 
                
> 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
>         Attachments: 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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