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Posted to issues@hbase.apache.org by "Jonathan Hsieh (JIRA)" <ji...@apache.org> on 2013/02/05 05:14:13 UTC
[jira] [Commented] (HBASE-7365) Safer table creation and deletion
using .tmp dir
[ https://issues.apache.org/jira/browse/HBASE-7365?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13571021#comment-13571021 ]
Jonathan Hsieh commented on HBASE-7365:
---------------------------------------
Any idea why this worked in the snapshot branch and why it is now flakey in 2/1/13's trunk? (I'm investigating now)
> 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
>
> Attachments: HBASE-7365-v0.patch, HBASE-7365-v1.patch, HBASE-7365-v2.patch, HBASE-7365-v3.patch
>
>
> 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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