original-brownbear commented on PR #13622:
URL: https://github.com/apache/lucene/pull/13622#issuecomment-2260327524

   >  if the first half of segments is submitted successfully and the second 
half is rejected, there are chances that the second half gets processed while 
the first half is still waiting in the queue.
   
   No that is not true I think. Each of the submitted tasks will take the 
lowest unprocessed index in the futures list (via the `taskId` counter and 
process it. The tasks that we submit are not specific tasks to be executed yet, 
it's always the same `Runnable` that will then grab the next task for the 
futures list.
   Execution order should be preserved as much as possible when processing on 
more than a single thread with the current approach?


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