gortiz commented on code in PR #11496:
URL: https://github.com/apache/pinot/pull/11496#discussion_r1321747015


##########
pinot-core/src/main/java/org/apache/pinot/core/transport/InstanceRequestHandler.java:
##########
@@ -321,6 +322,10 @@ private void sendResponse(ChannelHandlerContext ctx, 
String tableNameWithType, l
         LOGGER.info("Slow query: request handler processing time: {}, send 
response latency: {}, total time to handle "
             + "request: {}", queryProcessingTimeMs, sendResponseLatencyMs, 
totalQueryTimeMs);
       }
+      if (serializedDataTable.length > LARGE_RESPONSE_SIZE_THRESHOLD_BYTES) {
+        LOGGER.warn("Large query: response size in bytes: {}, table name {}",
+            serializedDataTable.length, tableNameWithType);

Review Comment:
   we could do that even before allocating the buffer if we add this limit in 
`LengthFieldBasedFrameDecoder`.
   
   I think we could just add a PinotProperty that defines the max dataTable 
size and set that to something like 100-500 by default. With that single 
change, we could avoid all these issues. That may be problematic in cases where 
a query requires a very large request from a server, but that is not a normal 
kind of queries in a OLAP system and it could be changed at startup time if 
needed



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