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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-5138) Support HDFS upgrade in HA
Date Fri, 17 Jan 2014 03:31:20 GMT

     [ https://issues.apache.org/jira/browse/HDFS-5138?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Aaron T. Myers updated HDFS-5138:
---------------------------------

    Attachment: HDFS-5138.patch

Here's an updated patch which implements Suresh's suggestion of doing away with the shared
log lock and instead requiring that both NNs be shut down during the upgrade and the second
NN re-bootstrapped after the first NN has performed the upgrade. I think this makes the procedure
a little more complex for operators, but it certainly does simplify the code.

[~sureshms] - I don't feel super strongly about it either way, so please let me know if you
find this more palatable. I'd appreciate a prompt review as this JIRA has been going on for
quite some time and I'd like to get it done.

> 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
>
>
> 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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