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Posted to issues@hbase.apache.org by "Matteo Bertozzi (JIRA)" <ji...@apache.org> on 2012/12/16 22:38:13 UTC
[jira] [Created] (HBASE-7365) Safer table creation and deletion
using .tmp dir
Matteo Bertozzi created HBASE-7365:
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Summary: Safer table creation and deletion using .tmp dir
Key: HBASE-7365
URL: https://issues.apache.org/jira/browse/HBASE-7365
Project: HBase
Issue Type: Improvement
Components: master
Reporter: Matteo Bertozzi
Assignee: Matteo Bertozzi
Fix For: 0.96.0
Currently tables are created in the root directory, and the removal works on the root directory.
Change the code to use a /hbase/.tmp directory to make the creation and removal a bit safer
Table Creation steps
* Create the table descriptor (table folder, in /hbase/.tmp/)
* Create the table regions (always in temp)
* Move the table from temp to the root folder
* Add the regions to meta
* Trigger assignment
* Set enable flag in ZooKeeper
Table Deletion steps
* Wait for regions in transition
* Remove regions from meta (use bulk delete)
* Move the table in /hbase/.tmp
* Remove the table from the descriptor cache
* Remove table from zookeeper
* Archive the table
The main changes in the current code are:
* Writing to /hbase/.tmp and then rename
* using bulk delete in DeletionTableHandler
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