[GitHub] [druid] didip opened a new issue #11514: index_parallel sub_task stuck on PENDING state even though I have plenty of capacity.

[GitBox]

didip opened a new issue #11514:
URL: https://github.com/apache/druid/issues/11514


   Hello folks, I am back again with the same problem.
   
   But I think I am making progress on my troubleshooting.
   
   When I look at ZK's /druid/indexer/tasks. I see there are 2 middleManager 
entries that, in reality, no longer exists.
   
   The strange part is: I am unable to delete those 2 records on ZK. Anyone 
knows a way to force delete records on ZK?
   
   It looks like my PENDING tasks are scheduled on those non existent 
middleManager even though I already explicitly disabled those 2 from the UI. 
   
   It doesn't matter if I actually have 100 extra slots. When 1 task is 
scheduled on those non existent middleManager, game over. Nothing else can get 
scheduled.
   
   I think this is a legit bug on index_parallel, yes?
   
   ### Affected Version
   
   0.21.1
   
   <img width="1280" alt="Screen Shot 2021-07-28 at 9 32 20 PM" 
src="https://user-images.githubusercontent.com/72918/127432373-e52512b2-09e9-43cd-a315-4b8334a7e662.png";>
   <img width="417" alt="Screen Shot 2021-07-28 at 9 32 57 PM" 
src="https://user-images.githubusercontent.com/72918/127432379-bc3a1acf-fdf6-471e-b21d-a907b626ea61.png";>
   


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