klsince commented on code in PR #9242:
URL: https://github.com/apache/pinot/pull/9242#discussion_r951965006


##########
pinot-core/src/main/java/org/apache/pinot/core/transport/InstanceRequestHandler.java:
##########
@@ -154,10 +200,23 @@ public void onSuccess(@Nullable byte[] responseBytes) {
 
       @Override
       public void onFailure(Throwable t) {
+        if (_enableQueryCancellation) {
+          String queryId = queryRequest.getQueryId();
+          if (LOGGER.isDebugEnabled()) {
+            LOGGER.debug("Remove track of running query: {} on failure", 
queryId);
+          }
+          _queryFuturesById.remove(queryId);
+        }
         // Send exception response.
-        LOGGER.error("Exception while processing instance request", t);
+        Exception ex = new Exception(t);
+        if (t instanceof CancellationException) {
+          LOGGER.info("Query: {} got cancelled", queryRequest.getQueryId());
+          ex = (Exception) t;
+        } else {
+          LOGGER.error("Exception while processing instance request", t);
+        }

Review Comment:
   yeah, should have been so. 



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