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https://issues.apache.org/jira/browse/HBASE-7365?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13571537#comment-13571537
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Matteo Bertozzi commented on HBASE-7365:
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Ok, a simple workaround is updating the descriptor cache before moving to temp,
so the next calls from the client are from the cache and not from disk...
but since we're rewriting the RPC, we should include a proper handling for the
async operations. [[email protected]] any ideas?
> 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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