albertobastos commented on code in PR #15609:
URL: https://github.com/apache/pinot/pull/15609#discussion_r2057947355


##########
pinot-query-runtime/src/main/java/org/apache/pinot/query/service/dispatch/QueryDispatcher.java:
##########
@@ -146,18 +156,39 @@ public QueryResult submitAndReduce(RequestContext 
context, DispatchableSubPlan d
     Set<QueryServerInstance> servers = new HashSet<>();
     try {
       submit(requestId, dispatchableSubPlan, timeoutMs, servers, queryOptions);
-      try {
-        return runReducer(requestId, dispatchableSubPlan, timeoutMs, 
queryOptions, _mailboxService);
-      } finally {
-        if (isQueryCancellationEnabled()) {
-          _serversByQuery.remove(requestId);
-        }
-      }
+      return runReducer(requestId, dispatchableSubPlan, timeoutMs, 
queryOptions, _mailboxService);
+    } catch (Exception ex) {

Review Comment:
   This `try-catch(Exception)-catch(Throwable)` chain feels a bit weird, I 
would at least add some comment explaining who is catching what.



##########
pinot-common/src/main/proto/worker.proto:
##########
@@ -39,6 +39,7 @@ message CancelRequest {
 
 message CancelResponse {
   // intentionally left empty

Review Comment:
   This comment no longer applies.



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