albertobastos commented on code in PR #15433:
URL: https://github.com/apache/pinot/pull/15433#discussion_r2033320446


##########
pinot-broker/src/main/java/org/apache/pinot/broker/api/resources/PinotClientRequest.java:
##########
@@ -559,6 +563,16 @@ public static Response 
getPinotQueryResponse(BrokerResponse brokerResponse)
     if (!exceptions.isEmpty()) {
       // set the header value as first exception error code value.
       queryErrorCodeHeaderValue = exceptions.get(0).getErrorCode();
+
+      // do log with the exception flagged with a particular marker for 
filtering
+      MDC.put("queryErrorCode", Integer.toString(queryErrorCodeHeaderValue));
+      StringBuilder sb = new StringBuilder();
+      sb.append("Query processing exceptions:");
+      for (QueryProcessingException exception : exceptions) {
+        sb.append(" ").append(exception.toString());
+      }

Review Comment:
   Not strictly needed, but seemed a nice addition for easier formatting or 
additional routing depending on the use case.
   
   Not sure about the cost of adding/removing items to the MDC to determine if 
it is worth it.
   
   Anyway, title/description updated.



##########
pinot-broker/pom.xml:
##########
@@ -45,6 +45,10 @@
       <groupId>org.apache.pinot</groupId>
       <artifactId>pinot-timeseries-planner</artifactId>
     </dependency>
+    <dependency>
+      <groupId>org.apache.logging.log4j</groupId>
+      <artifactId>log4j-core</artifactId>
+    </dependency>

Review Comment:
   You're right, the used classes belong to `slf4j-api`. I should explicitly 
add it to the module's `pom.xml` anyway, right? 89b7f5ef7f



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