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From "Jim Kellerman (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1108) Redundant meta tables
Date Sun, 04 Jan 2009 18:31:44 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1108?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12660617#action_12660617
] 

Jim Kellerman commented on HBASE-1108:
--------------------------------------

HBASE-7 (fsck for HBase) is supposed to address this issue.

> Redundant meta tables
> ---------------------
>
>                 Key: HBASE-1108
>                 URL: https://issues.apache.org/jira/browse/HBASE-1108
>             Project: Hadoop HBase
>          Issue Type: Improvement
>            Reporter: Andrew Purtell
>             Fix For: 0.20.0
>
>
> If the data file for -ROOT- or .META. is damaged, a HBase installation is rendered inoperative.
Manual recovery through writing a new -ROOT- by hand is relatively simple (I think) but it's
not simple and maybe not even possible to recreate a .META. containing thousands of regions.
During one experiment I lost the entire .META. data file due to DFS errors during compaction.
This can be avoided by utilizing multiple backing data files for -ROOT- and .META. synchronized
in a manner that avoids total data loss should the filesystem become degraded. 

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