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From "Himanshu Vashishtha (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8348) Polish the migration to 0.96
Date Thu, 22 Aug 2013 22:01:55 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8348?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13747949#comment-13747949
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Himanshu Vashishtha commented on HBASE-8348:
--------------------------------------------

bq. and the dir is used when you check, right? Not when you execute?
Yes.

bq. mutually exclusive
I made it to handle both (just in case) such that if a user gives both, then check will be
evaluated first, and then the execute. 
In case there is any error in check (a HFileV1 is present, for example), then it will not
go to the execute step.

bq. If someone wants to run the v1 check against a running 0.94 instance, how do they do that
now? They do it out of a 0.96 binary?
Yes. They could point to any directory using -dir option while checking.

bq. In the process check, do we check for zk? If zk is down, how does it get 'udated'?
Yes, a running zk and hdfs is required.

Sorry if the usage is still not clear enough. I was thinking of writing a little help section
in the ref guide to help admins.
                
> Polish the migration to 0.96
> ----------------------------
>
>                 Key: HBASE-8348
>                 URL: https://issues.apache.org/jira/browse/HBASE-8348
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.95.0
>            Reporter: Jean-Daniel Cryans
>            Assignee: rajeshbabu
>            Priority: Blocker
>             Fix For: 0.96.0
>
>         Attachments: HBASE-8348-approach-2.patch, HBASE-8348-approach-2-v2.1.patch, HBASE-8348-approach-2-v2.2.patch,
HBASE-8348-approach-2-v2.3.patch, HBASE-8348-approach-2-v2.4.patch, HBASE-8348-approach-3.patch,
HBASE-8348_trunk.patch, HBASE-8348_trunk_v2.patch, HBASE-8348_trunk_v3.patch, log, log-2
>
>
> Currently, migration works but there's still a couple of rough edges:
>  - HBASE-8045 finished the .META. migration but didn't remove ROOT, so it's still on
the filesystem.
>  - Data in ZK needs to be removed manually. Either we fix up the data in ZK or we delete
it ourselves.
>  - TestMetaMigrationRemovingHTD has a testMetaUpdatedFlagInROOT method, but ROOT is gone
now.
> Elliott was also mentioning that we could have "hbase migrate" do the HFileV1 checks,
clear ZK, remove ROOT, etc.

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