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https://issues.apache.org/jira/browse/ACCUMULO-621?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13289669#comment-13289669
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Eric Newton commented on ACCUMULO-621:
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There are three loops that migrate the tablets to the offline state. The root
tablet, the non-root metadata tablets, and all the rest. Each loop needs to
wait for the next to be be stopped before they can begin offlining their
tablets.
> master fails to shutdown
> ------------------------
>
> Key: ACCUMULO-621
> URL: https://issues.apache.org/jira/browse/ACCUMULO-621
> Project: Accumulo
> Issue Type: Bug
> Components: master
> Affects Versions: 1.4.0, 1.3.5
> Reporter: Eric Newton
> Assignee: Eric Newton
> Priority: Minor
>
> The functional test "ShutdownDuringStart" found a rare issue with shutdown.
> * master starts
> * assigns root tablet
> * goal state is switch to CLEAN_STOP
> * master assigns non-root METADATA tablets
> * master transitions into UNLOAD_NON_ROOT_METADATA
> * master sees the METADATA tablets are not loaded
> * master transitions into UNLOAD_ROOT_TABLET
> * tablet server loads the METADATA tablets
> * master unloads the root tablet
> * tablet server cannot change the state of the METADATA tables
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