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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (HDFS-6800) Support Datanode layout changes with rolling upgrade
Date Fri, 29 Aug 2014 07:29:55 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6800?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14114974#comment-14114974
] 

Arpit Agarwal edited comment on HDFS-6800 at 8/29/14 7:29 AM:
--------------------------------------------------------------

Committed to trunk only.


was (Author: arpitagarwal):
Committed to trunk and branch-2.

> Support Datanode layout changes with rolling upgrade
> ----------------------------------------------------
>
>                 Key: HDFS-6800
>                 URL: https://issues.apache.org/jira/browse/HDFS-6800
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode
>    Affects Versions: 2.6.0
>            Reporter: Colin Patrick McCabe
>            Assignee: James Thomas
>             Fix For: 3.0.0, 2.6.0
>
>         Attachments: HDFS-6800.2.patch, HDFS-6800.3.patch, HDFS-6800.4.patch, HDFS-6800.5.patch,
HDFS-6800.6.patch, HDFS-6800.7.patch, HDFS-6800.8.patch, HDFS-6800.patch
>
>
> We need to handle attempts to rolling-upgrade the DataNode to a new storage directory
layout.
> One approach is to disallow such upgrades.  If we choose this approach, we should make
sure that the system administrator gets a helpful error message and a clean failure when trying
to use rolling upgrade to a version that doesn't support it.  Based on the compatibility guarantees
described in HDFS-5535, this would mean that *any* future DataNode layout changes would require
a major version upgrade.
> Another approach would be to support rolling upgrade from an old DN storage layout to
a new layout.  This approach requires us to change our documentation to explain to users that
they should supply the {{\-rollback}} command on the command-line when re-starting the DataNodes
during rolling rollback.  Currently the documentation just says to restart the DataNode normally.
> Another issue here is that the DataNode's usage message describes rollback options that
no longer exist.  The help text says that the DN supports {{\-rollingupgrade rollback}}, but
this option was removed by HDFS-6005.



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