walterddr opened a new pull request, #10797:
URL: https://github.com/apache/pinot/pull/10797

   singleton exchange was broken b/c of the worker assignment strategy.
   
   This is a fix for instantiating singleton exchange, more to follow up 
properly
   
   this change
   ===
   - only send data via the local exchange and doesn't send data over the 
network I/O
   - will still make broadcast of EOS block to all mailbox (regardless of 
whether they are local) for signaling an end of a stage)
   
   follow up
   === 
   - make sure it work with multiple worker on the same host (partition 
strategy and worker assignment)
   - make mailbox assignment visitor to create proper list of send/receive 
based on exchange type instead of creating a fully-connected network and only 
send EOS over the wire for network I/O
   
   


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