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From "Eli Collins (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8968) add flag to disable completely version check in the TaskTracker and DataNode
Date Thu, 25 Oct 2012 18:17:14 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8968?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13484336#comment-13484336
] 

Eli Collins commented on HADOOP-8968:
-------------------------------------

@Suresh,
The use case for this change is allowing a rolling upgrade when there is not an exact version
match, ie across minor releases in branch-1. Currently we disallow that, from HADOOP-8209:

{quote}
In order to support this, let's add an option that is off by default, but, when enabled, makes
the DN and TT version check just check for an exact version match (eg "1.0.2") but ignore
the build revision (DN) and the source checksum (TT). Two builds still need to match the major,
minor, and point numbers, but nothing else.
{quote}

@Tucu,
- Seems like we should still assert on invalid builds even if skip check flag is used 
- Should remove the "not" in "different versions are not permitted"
- Nit, feel free to ignore, I'd rename this hadoop.skip.worker.version.check
Otherwise looks good.
                
> add flag to disable completely version check in the TaskTracker and DataNode
> ----------------------------------------------------------------------------
>
>                 Key: HADOOP-8968
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8968
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 1.1.0
>            Reporter: Alejandro Abdelnur
>            Assignee: Alejandro Abdelnur
>             Fix For: 1.2.0
>
>         Attachments: HADOOP-8968.patch, HADOOP-8968.patch
>
>
> The current logic in the TaskTracker and the DataNode to allow a relax version check
with the JobTracker and NameNode works only if the versions of Hadoop are exactly the same.
> We should add a switch to disable version checking completely, to enable rolling upgrades
between compatible versions (typically patch versions).

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