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https://issues.apache.org/jira/browse/HDFS-14205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16795417#comment-16795417
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Chao Sun commented on HDFS-14205:
---------------------------------

Thanks [~vagarychen]. I think we need to include the change for #2 and #4. In 
trunk, the HDFS-6440 came before HDFS-13676 and HDFS-9533. However, in branch-2 
we don't have HDFS-6440 but have the latter two: the backported version for 
these two is slightly modified to accommodate the single-SBN architecture but 
no longer works with HDFS-6440.

Yes, after this we'll need to backport a few follow up JIRAs after HDFS-6440. 
I'll create JIRAs for the work. Hopefully they should be relatively 
straightforward. :)
 

 

> Backport HDFS-6440 to branch-2
> ------------------------------
>
>                 Key: HDFS-14205
>                 URL: https://issues.apache.org/jira/browse/HDFS-14205
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Chen Liang
>            Assignee: Chao Sun
>            Priority: Major
>         Attachments: HDFS-14205-branch-2.001.patch, 
> HDFS-14205-branch-2.002.patch, HDFS-14205-branch-2.003.patch, 
> HDFS-14205-branch-2.004.patch, HDFS-14205-branch-2.005.patch, 
> HDFS-14205-branch-2.006.patch, HDFS-14205-branch-2.007.patch, 
> HDFS-14205-branch-2.008.patch, HDFS-14205-branch-2.009.patch
>
>
> Currently support for more than 2 NameNodes (HDFS-6440) is only in branch-3. 
> This JIRA aims to backport it to branch-2, as this is required by HDFS-12943 
> (consistent read from standby) backport to branch-2.



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