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From "Jonathan Hsieh (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7365) Safer table creation and deletion using .tmp dir
Date Tue, 05 Feb 2013 18:32:11 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7365?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13571552#comment-13571552
] 

Jonathan Hsieh commented on HBASE-7365:
---------------------------------------

There still is a race where the descriptor cache may get reloaded if between the cache remove
and he table rename.  probably need to remove again right afterwards.  I'll tweak and test
for the short term.  I think changing the rpcs to have consistent semantics for async calls
is a problem bigger than this guy's scope currently.
                
> 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: 7365-v4.patch, 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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