[GitHub] [pinot] xiangfu0 commented on issue #11187: [multistage]Leaf stage unavailable segment or empty table may fail query execution

["xiangfu0 (via GitHub)" <gi...@apache.org>]

xiangfu0 commented on issue #11187:
URL: https://github.com/apache/pinot/issues/11187#issuecomment-1654709741

   > looks like the issue is here:
   > 
   > https://github.com/apache/pinot/blob/2904f1bce19f93b4e6f2f6492e741a5adc02dd82/pinot-query-planner/src/main/java/org/apache/pinot/query/routing/WorkerManager.java#L124-L132
   > 
   > ^ it shouldn't attach the server instance if list of segments are empty
   
   This issue is triggered when all the segments on that server become unavailable, then you still have the ServerInstance mapping, but no available segment, then leaf stage is not assigned still.
   
   IMO, there are two ways to fix: 1. assign a leaf stage with empty segment list; 2. don't schedule leaf, just let intermediate stage mailboxRecv return empty data block.


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