[jira] [Commented] (HBASE-29386) SnapshotProcedure and EnableTableProcedure can cause a deadlock

["Hudson (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-29386?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17986663#comment-17986663 ] 

Hudson commented on HBASE-29386:
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Results for branch branch-2.6
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> SnapshotProcedure and EnableTableProcedure can cause a deadlock
> ---------------------------------------------------------------
>
>                 Key: HBASE-29386
>                 URL: https://issues.apache.org/jira/browse/HBASE-29386
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Hernan Gelaf-Romer
>            Assignee: Hernan Gelaf-Romer
>            Priority: Major
>              Labels: pull-request-available
>
> At my job, we've discovered that enable table procedures can be executed at the same time as a snapshot procedure and can cause a deadlock which prevents both procedures from finishing. 
>  
> The enable table procedure will be kicked off first, and will run and kick off children subprocedures which will enable the region. At this point, the parent process releases it's lock, and the snapshot procedure starts to execute. The snapshot procedure gets to the state SNAPSHOT_WRITE_SNAPSHOT_INFO, and then continues to repeat this step as it waits for the table to be enabled. 
>  
> The table enable procedure will never re-acquire the lock and run, which means both procedures are stuck indefinitely. A solution here is to allow the snapshot procedure to be suspended in the case that the table is neither disabled or enabled, which will allow other table related procedures to run



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