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https://issues.apache.org/jira/browse/ACCUMULO-2219?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13877526#comment-13877526
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Keith Turner commented on ACCUMULO-2219:
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Yeah, need more info.  Its possible the 2nd fate operation was stuck
waiting for something to happen on a tablet server.  The output of the fate
admin command and a jstack of the master would be a good start.





> parallelize the operation of certain FATE operations
> ----------------------------------------------------
>
>                 Key: ACCUMULO-2219
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-2219
>             Project: Accumulo
>          Issue Type: Improvement
>          Components: fate
>    Affects Versions: 1.4.4, 1.5.0
>            Reporter: Adam Fuchs
>
> As in ACCUMULO-2217, a user operation can cause the FATE processor to get 
> stuck and require administrative action to make progress on any future FATE 
> operations. We should look at ways to parallelize the execution of FATE tasks 
> that commute and don't interfere with each other. Maybe there are some rules 
> we can use to run certain well-known operations in parallel (like a merge on 
> one table at the same time as a deletion of another table, for example).
> This has a strong impact on multi-tenancy, preventing one user's operations 
> from hosing all the other users.



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