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From "Zhihong Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-6236) Offline meta repair fails if the HBase base mount point is on a different cluster/volume than its parent in a ViewFS or similar FS
Date Sat, 23 Jun 2012 04:45:43 GMT

     [ https://issues.apache.org/jira/browse/HBASE-6236?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Zhihong Ted Yu updated HBASE-6236:
----------------------------------

    Attachment: 6236-94.addendum

Addendum adds -sidelineDir option to hbck
                
> Offline meta repair fails if the HBase base mount point is on a different cluster/volume
than its parent in a ViewFS or similar FS
> ----------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-6236
>                 URL: https://issues.apache.org/jira/browse/HBASE-6236
>             Project: HBase
>          Issue Type: Bug
>          Components: hbck
>            Reporter: Aditya Kishore
>            Assignee: Aditya Kishore
>             Fix For: 0.96.0, 0.94.1
>
>         Attachments: 6236-94.addendum, 6236-94.txt, 6236_trunk.patch, HBASE-6236_94.patch,
HBASE-6236_trunk.patch
>
>
> While building the .META. and \-ROOT\- from FS data alone (HBASE-4377), hbck tries to
move the existing .META. and \-ROOT\- directories to a backup folder.
> This backup folder is created at the same level as the base HBase folder (e.g. /hbase-xxxxxx
if the base HBase folder is '/hbase').
> In a federated HDFS like ViewFS and other similar FS implementations, it is not possible
to rename files/directories across namespace volumes (ViewFS guide section 3.5) and as a result
hbck crashes.
> A solution to this problem is to create the backup directory under the folder where HBase
base folder has been mounted. This ensures that source and destination of rename operation
are on the same namespace volume.
> Patch for 0.94 and trunk is attached for review. The patch modifies the location of the
backup directory from '/hbase-xxxxxxx' to '/hbase/.hbcktmp-xxxxxxx'

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