Re: [I] Investigate tablet hosting during merge [accumulo]

["dlmarion (via GitHub)" <gi...@apache.org>]

dlmarion commented on issue #3780:
URL: https://github.com/apache/accumulo/issues/3780#issuecomment-5398089885

   In 4.0 the Manager starts a `FindMergeableRangeTask` thread that runs periodically. It looks at tablets to see if they meet criteria for a merge based on the table's split threshold, max mergeability threshold , merge file max and the tablet's mergeability setting. When the criteria is met the thread submits a system merge fate operation. The system merge fate operation reserves the tablets, setting an operation id in the tablet metadata which will cause the TabletGroupWatcher to unhost the tablets. The system merge fate operation waits for all of the tablets involved in the operation to be unhosted before continuing.
   
   It doesn't appear that the merge operation waits unnecessarily for tablets to be hosted before unassigning them.
   
   


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