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From "Himanshu Vashishtha (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8348) Polish the migration to 0.96
Date Wed, 14 Aug 2013 16:57:50 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8348?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13739870#comment-13739870
] 

Himanshu Vashishtha commented on HBASE-8348:
--------------------------------------------

This is great. I was thinking of having a Upgrade class (as Stack suggested) and let it do
all the leg work (call various migrate tools and stuff). Either works. 

So, we just stop the upgrade in case of error in any of the above steps? Yes, options for
upgrading different components would be great. 

Yes, HFileV1Detector tool should be run first and then if there are any HFileV1, prompt a
message for compacting those regions. 


I don't think we should delete the hbase.id file. It could have issues with cyclic replication,
for example, where we detect the origin of an edit by its cluster id. I hit HBASE-9177 last
night when doing the upgrade where we read and write cluster id differently in 94 and trunk
(write utf, but do readFully). I will review the patch there. 
                
> 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: Critical
>             Fix For: 0.95.2
>
>         Attachments: HBASE-8348_trunk.patch, HBASE-8348_trunk_v2.patch, HBASE-8348_trunk_v3.patch
>
>
> 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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