From 08f9ec1cae50a052e2ccaaf03664028f17360b33 Mon Sep 17 00:00:00 2001
From: Akshat Jain <akjn11@gmail.com>
Date: Mon, 5 Aug 2024 16:52:56 +0530
Subject: [PATCH] Memoize the redundant calls to overlord in sql statements
 endpoint (#16839)

---
 .../sql/resources/SqlStatementResource.java   | 23 +++++++++----------
 1 file changed, 11 insertions(+), 12 deletions(-)

diff --git a/extensions-core/multi-stage-query/src/main/java/org/apache/druid/msq/sql/resources/SqlStatementResource.java b/extensions-core/multi-stage-query/src/main/java/org/apache/druid/msq/sql/resources/SqlStatementResource.java
index 322727aea92d..f56622804786 100644
--- a/extensions-core/multi-stage-query/src/main/java/org/apache/druid/msq/sql/resources/SqlStatementResource.java
+++ b/extensions-core/multi-stage-query/src/main/java/org/apache/druid/msq/sql/resources/SqlStatementResource.java
@@ -113,7 +113,6 @@
 import java.util.Map;
 import java.util.Objects;
 import java.util.Optional;
-import java.util.function.Supplier;
 import java.util.stream.Collectors;
 
 
@@ -588,19 +587,19 @@ private Optional<SqlStatementResult> getStatementStatus(
     MSQControllerTask msqControllerTask = getMSQControllerTaskAndCheckPermission(queryId, authenticationResult, forAction);
     SqlStatementState sqlStatementState = SqlStatementResourceHelper.getSqlStatementState(statusPlus);
 
-    Supplier<Optional<MSQTaskReportPayload>> msqTaskReportPayloadSupplier = () -> {
+    MSQTaskReportPayload taskReportPayload = null;
+    if (detail || SqlStatementState.FAILED == sqlStatementState) {
       try {
-        return Optional.ofNullable(SqlStatementResourceHelper.getPayload(
+        taskReportPayload = SqlStatementResourceHelper.getPayload(
             contactOverlord(overlordClient.taskReportAsMap(queryId), queryId)
-        ));
+        );
       }
       catch (DruidException e) {
-        if (e.getErrorCode().equals("notFound") || e.getMessage().contains("Unable to contact overlord")) {
-          return Optional.empty();
+        if (!e.getErrorCode().equals("notFound") && !e.getMessage().contains("Unable to contact overlord")) {
+          throw e;
         }
-        throw e;
       }
-    };
+    }
 
     if (SqlStatementState.FAILED == sqlStatementState) {
       return SqlStatementResourceHelper.getExceptionPayload(
@@ -608,7 +607,7 @@ private Optional<SqlStatementResult> getStatementStatus(
           taskResponse,
           statusPlus,
           sqlStatementState,
-          msqTaskReportPayloadSupplier.get().orElse(null),
+          taskReportPayload,
           jsonMapper,
           detail
       );
@@ -627,9 +626,9 @@ private Optional<SqlStatementResult> getStatementStatus(
               msqControllerTask.getQuerySpec().getDestination()
           ).orElse(null) : null,
           null,
-          detail ? SqlStatementResourceHelper.getQueryStagesReport(msqTaskReportPayloadSupplier.get().orElse(null)) : null,
-          detail ? SqlStatementResourceHelper.getQueryCounters(msqTaskReportPayloadSupplier.get().orElse(null)) : null,
-          detail ? SqlStatementResourceHelper.getQueryWarningDetails(msqTaskReportPayloadSupplier.get().orElse(null)) : null
+          SqlStatementResourceHelper.getQueryStagesReport(taskReportPayload),
+          SqlStatementResourceHelper.getQueryCounters(taskReportPayload),
+          SqlStatementResourceHelper.getQueryWarningDetails(taskReportPayload)
       ));
     }
   }