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https://issues.apache.org/jira/browse/HADOOP-9280?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13601140#comment-13601140
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Suresh Srinivas commented on HADOOP-9280:
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[~farrellee] Thank you for pointing out the releases and clearing things.

bq. Suresh, I am not a Hadoop committer. I am just an end user who suffered 
from this issue and reported / responded on these tickets. I cannot point you 
to the code base / branch. That is the Hadoop team who knows where their code 
lives.
That is reasonable. However, in several comments you indicated the release as 
0.2. This is indeed a release from may be 5-6 years ago and is not in use any 
more. My reason for asking you to point out the release is to understand the 
exact release you are talking about, so that I can out figure the release you 
were pointing out. When pointing out the issues, using the right release 
numbers would help.

I also think there may be some confusion around release numbering and upgrade 
paths. It indeed is confusing.
* Hadoop community decided to call the release 0.20.205 as 1.0 due to its 
stability. It is off of 0.20 branches.
* 0.22, 0.23 and 2.x are later releases. These are off of the branches that 
come after 0.20. Hence upgrade from 0.22 or 0.23 to 1.0 is going from a later 
release to a release based on older branch. The right upgrade path is to go 
from 0.23 to 2.0. Going from 0.23 to 1.0 is not a supported upgrade path.

bq. The problem is that this fix never went into any of the 1.x branches.
Based on the above explanation, not all the major fixes go from 0.23 and 2.0 
releases to 1.x release. Only the issues that are flagged by the community as 
important goes to 1.x releases. 
                
> HADOOP-7101 was never merged from 0.23.x to the 1.x branch
> ----------------------------------------------------------
>
>                 Key: HADOOP-9280
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9280
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: security
>    Affects Versions: 1.0.4
>            Reporter: Claus Ibsen
>            Assignee: Suresh Srinivas
>            Priority: Critical
>
> See HADOOP-7101
> This code fix went into the 0.23 branch.
> But was never merged into the 1.x branch, which causing problems for people 
> upgrading from 0.23 to 1.0.

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