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From "Matteo Bertozzi (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-7365) Safer table creation and deletion using .tmp dir
Date Sun, 16 Dec 2012 21:38:13 GMT
Matteo Bertozzi created HBASE-7365:

             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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