satwik-pachigolla commented on code in PR #18111:
URL: https://github.com/apache/pinot/pull/18111#discussion_r3042121633
##########
pinot-broker/src/main/java/org/apache/pinot/broker/requesthandler/MultiStageBrokerRequestHandler.java:
##########
@@ -198,6 +198,29 @@ public MultiStageBrokerRequestHandler(PinotConfiguration
config, String brokerId
@Override
public void start() {
_queryDispatcher.start();
+ warmupCompile();
+ }
+
+ /**
+ * Best-effort warmup of the Calcite compile pipeline before serving
traffic. Reduces but does
+ * not guarantee that cold-start compilation times won't breach the timeout
limit enforced in #14946.
+ */
+ private void warmupCompile() {
+ try {
+ ImmutableQueryEnvironment.Config warmupConf = getQueryEnvConf(null,
Map.of(), -1L);
+ QueryEnvironment warmupEnv = new QueryEnvironment(warmupConf,
_multiClusterRoutingContext);
+ long startMs = System.currentTimeMillis();
+ LOGGER.info("MSE startup warmup: compiling query");
+ ExecutorService exec = Executors.newSingleThreadExecutor();
+ try {
+ exec.submit(() -> warmupEnv.compile("SELECT 1")).get(30,
TimeUnit.SECONDS);
+ } finally {
+ exec.shutdownNow();
+ }
+ LOGGER.info("MSE startup warmup completed in {}ms",
System.currentTimeMillis() - startMs);
+ } catch (Exception e) {
+ LOGGER.error("MSE broker startup warmup failed", e);
+ }
Review Comment:
done
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