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From "Subbu M Iyer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4301) META migration from 0.90 to trunk fails
Date Wed, 31 Aug 2011 19:34:10 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4301?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13094821#comment-13094821
] 

Subbu M Iyer commented on HBASE-4301:
-------------------------------------

I think I know what the root cause of this problem might be:

Todd, you mentioned that you are not seeing the .tableinfo for -ROOT-
and .META. for both fresh startup cluster as well as migrated one
which is a problem. We must have .tableinfo for all the tables
including ROOT and META.

In the case of the migration from older version to trunk, the
tableinfo data for .META. and -ROOT- are not getting created. We
originally had this taken care by creating the .tableinfo at create
region time which would address both older migration as well as fresh
start cases.

Long story short, we need to patch this by making master create the
ROOT and META tableinfo at startup (if required, only once during
first time start up).

In MasterFileSystem we might do some thing like:


324 	if (!FSUtils.rootRegionExists(fs, rd)) {
325 	bootstrap(rd, c);
326 	}

       // Create META and ROOT tableInfo if required.

	if (!FSUtils.rootTableInfoExists(fs, rd)) {	
	FSUtils.createTableDescriptor(HTableDescriptor.ROOT_TABLEDESC, this.conf);
	FSUtils.createTableDescriptor(HTableDescriptor.META_TABLEDESC, this.conf);
	}

Stack: Can you take this since I am out?

thanks
Subbu



> META migration from 0.90 to trunk fails
> ---------------------------------------
>
>                 Key: HBASE-4301
>                 URL: https://issues.apache.org/jira/browse/HBASE-4301
>             Project: HBase
>          Issue Type: Bug
>          Components: master
>    Affects Versions: 0.92.0
>            Reporter: Todd Lipcon
>            Priority: Blocker
>             Fix For: 0.92.0
>
>         Attachments: master-log.txt
>
>
> I started a trunk cluster as an upgrade from 0.90.4ish, and now my META table is screwed.
I can't scan it, etc, and other operations fail.

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