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https://issues.apache.org/jira/browse/HBASE-6236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13396531#comment-13396531
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Aditya Kishore commented on HBASE-6236:
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@[[email protected]]
Agree that it would be a clean to move the prefix to a constant.
However, we would still want to enforce 2 criteria on the backup folder
name/location:
1. The folder must be immediate child of HBase base folder to ensure that
fs.rename() works, and
2. Prefix starts with a "." to ensure that it does not conflict with or
presumed to be a table directory.
Instead of making it configurable, how about print a message at the end
notifying the user the location of the backup folder?
> 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
> Attachments: HBASE-6236_0.94.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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