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Posted to dev@hbase.apache.org by "Andrew Purtell (JIRA)" <ji...@apache.org> on 2009/01/04 10:22:44 UTC

[jira] Created: (HBASE-1108) Redundant meta tables

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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[jira] Updated: (HBASE-1108) Redundant meta tables

Posted by "Andrew Purtell (JIRA)" <ji...@apache.org>.
     [ https://issues.apache.org/jira/browse/HBASE-1108?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrew Purtell updated HBASE-1108:
----------------------------------

    Fix Version/s:     (was: 0.20.0)

> Redundant meta tables
> ---------------------
>
>                 Key: HBASE-1108
>                 URL: https://issues.apache.org/jira/browse/HBASE-1108
>             Project: Hadoop HBase
>          Issue Type: Sub-task
>            Reporter: Andrew Purtell
>
> 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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[jira] Updated: (HBASE-1108) Redundant meta tables

Posted by "Jim Kellerman (JIRA)" <ji...@apache.org>.
     [ https://issues.apache.org/jira/browse/HBASE-1108?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jim Kellerman updated HBASE-1108:
---------------------------------

    Issue Type: Sub-task  (was: Improvement)
        Parent: HBASE-7

> Redundant meta tables
> ---------------------
>
>                 Key: HBASE-1108
>                 URL: https://issues.apache.org/jira/browse/HBASE-1108
>             Project: Hadoop HBase
>          Issue Type: Sub-task
>            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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[jira] Commented: (HBASE-1108) Redundant meta tables

Posted by "Jim Kellerman (JIRA)" <ji...@apache.org>.
    [ 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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