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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5138) Support HDFS upgrade in HA
Date Mon, 27 Jan 2014 02:30:45 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5138?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13882521#comment-13882521
] 

Aaron T. Myers commented on HDFS-5138:
--------------------------------------

Hi Suresh - thanks for the comments. Given that Todd has already committed this to trunk and
very kindly created a branch-2 patch, and given that this change is quite large so rebasing
it on trunk is difficult, and given that most of your review comments are rather small, I
think we should address your comments in a follow-up JIRA. Is that alright with you? I'm sure
I can get these addressed in a day or two at most. Please let me know ASAP and I'll go ahead
and file it.

Todd - thanks a lot for taking care of dealing with the conflicts so this can be committed
to branch-2. The branch-2 patch looks great to me.

> Support HDFS upgrade in HA
> --------------------------
>
>                 Key: HDFS-5138
>                 URL: https://issues.apache.org/jira/browse/HDFS-5138
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.1.1-beta
>            Reporter: Kihwal Lee
>            Assignee: Aaron T. Myers
>            Priority: Blocker
>         Attachments: HDFS-5138.patch, HDFS-5138.patch, HDFS-5138.patch, HDFS-5138.patch,
HDFS-5138.patch, HDFS-5138.patch, HDFS-5138.patch, HDFS-5138.patch, HDFS-5138.patch, HDFS-5138.patch,
HDFS-5138.patch, hdfs-5138-branch-2.txt
>
>
> With HA enabled, NN wo't start with "-upgrade". Since there has been a layout version
change between 2.0.x and 2.1.x, starting NN in upgrade mode was necessary when deploying 2.1.x
to an existing 2.0.x cluster. But the only way to get around this was to disable HA and upgrade.

> The NN and the cluster cannot be flipped back to HA until the upgrade is finalized. If
HA is disabled only on NN for layout upgrade and HA is turned back on without involving DNs,
things will work, but finaliizeUpgrade won't work (the NN is in HA and it cannot be in upgrade
mode) and DN's upgrade snapshots won't get removed.
> We will need a different ways of doing layout upgrade and upgrade snapshot.  I am marking
this as a 2.1.1-beta blocker based on feedback from others.  If there is a reasonable workaround
that does not increase maintenance window greatly, we can lower its priority from blocker
to critical.



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