tibrewalpratik17 opened a new issue, #11076:
URL: https://github.com/apache/pinot/issues/11076

   I am trying to run multistage queries locally but always ends up in this 
error:
   
   `
   java.io.IOException: Failed : HTTP error code : 500. Root Cause: 
<html><head><title>Grizzly 2.4.4</title><style><!--div.header 
{font-family:Tahoma,Arial,sans-serif;color:white;background-color:#003300;font-size:22px;-moz-border-radius-topleft:
 10px;border-top-left-radius: 10px;-moz-border-radius-topright: 
10px;border-top-right-radius: 10px;padding-left: 5px}div.body 
{font-family:Tahoma,Arial,sans-serif;color:black;background-color:#FFFFCC;font-size:16px;padding-top:10px;padding-bottom:10px;padding-left:10px}div.footer
 
{font-family:Tahoma,Arial,sans-serif;color:white;background-color:#666633;font-size:14px;-moz-border-radius-bottomleft:
 10px;border-bottom-left-radius: 10px;-moz-border-radius-bottomright: 
10px;border-bottom-right-radius: 10px;padding-left: 5px}BODY 
{font-family:Tahoma,Arial,sans-serif;color:black;background-color:white;}B 
{font-family:Tahoma,Arial,sans-serif;color:black;}A {color : black;}HR {color : 
#999966;}--></style> </head><body><div class="header">Request fail
 ed.</div><div class="body">Request failed.</div><div class="footer">Grizzly 
2.4.4</div></body></html>
   `
   
   This happens when i run the quick start script for colocated_join / 
multi_stage and try to run this query:
   ```select * from userAttributes limit 10 option(useMultistageEngine=true)```
   
   The query works fine without the multistage query option as it uses Http 
calls b/w broker and server. I understand this is happening during grpc call 
between broker and server and the call never reaches from broker -> server. It 
happens exactly at this point of code - 
https://github.com/apache/pinot/blob/9bb3cbb3d6ebf5a9fcd8a5410a5794aee02c7ee4/pinot-query-runtime/src/main/java/org/apache/pinot/query/service/dispatch/DispatchClient.java#L57
   
   I have tried this out in multiple laptops by cloning and building pinot and 
trying to run multistage queries but everytime it gets stuck here. Do we need 
to additionally install anything to get it working?
   
   Full stack trace - 
https://gist.github.com/tibrewalpratik17/41e49d1769b957ab5e4c8100d27647bb


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