Aditya Kishore created HBASE-6236:
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Summary: 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
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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