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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5709) Improve upgrade with existing files and directories named ".snapshot"
Date Tue, 21 Jan 2014 19:57:20 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5709?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13877790#comment-13877790

Aaron T. Myers commented on HDFS-5709:

bq. Where is this being proposed? Why is downgrade required in any of the proposed solutions?

The alternative to automatically renaming files is to have to do this, but I see now that
your point is just to more forcefully make users aware that a rename is taking place. I personally
think this is overkill, but I don't feel super strongly about this.

bq. Doing the same thing in multiple ways seems unnecessary and confusing. I do not see any
significant advantage to it. Perhaps I do not understand this solution.

It won't be confusing at all for anyone who doesn't want it, since they'll just never set
the config setting at all. For those users who want the rename to be a bit configurable, however,
it will be a significant convenience. This isn't really any different than making something
configurable but also setting a reasonable default that most users will not change.

> Improve upgrade with existing files and directories named ".snapshot"
> ---------------------------------------------------------------------
>                 Key: HDFS-5709
>                 URL: https://issues.apache.org/jira/browse/HDFS-5709
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: namenode
>    Affects Versions: 3.0.0, 2.2.0
>            Reporter: Andrew Wang
>            Assignee: Andrew Wang
>              Labels: snapshots, upgrade
>         Attachments: hdfs-5709-1.patch, hdfs-5709-2.patch, hdfs-5709-3.patch, hdfs-5709-4.patch,
> Right now in trunk, upgrade fails messily if the old fsimage or edits refer to a directory
named ".snapshot". We should at least print a better error message (which I believe was the
original intention in HDFS-4666), and [~atm] proposed automatically renaming these files and

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