From 0b9cd73509fc09758a99847c456242cb97522cb1 Mon Sep 17 00:00:00 2001
From: Vladimir Krivosheev <vladimir.krivosheev@jetbrains.com>
Date: Fri, 2 May 2025 09:54:42 +0200
Subject: [PATCH] IJPL-179600 do not mark db file on disk as modified if no
 data changes

GitOrigin-RevId: 261fd5765377d7fedd661fb8329237e246453d9c
---
 build/jvm-rules/src/jvm-builder/storage/mapStorage.kt | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/build/jvm-rules/src/jvm-builder/storage/mapStorage.kt b/build/jvm-rules/src/jvm-builder/storage/mapStorage.kt
index bc2b4c7816e7..cfb43568e06f 100644
--- a/build/jvm-rules/src/jvm-builder/storage/mapStorage.kt
+++ b/build/jvm-rules/src/jvm-builder/storage/mapStorage.kt
@@ -201,8 +201,15 @@ internal class BazelPersistentMapletFactory private constructor(
   override fun close() {
     // during save, we enumerate strings, so we cannot save as a part of close,
     // as in this case string enumerator maps maybe not saved (as being closed)
-    store.commit()
-    store.close()
+    if (store.hasUnsavedChanges()) {
+      store.commit()
+      store.close()
+    }
+    else {
+      // even if no changes, MvStore update file header -
+      // we want to avoid unnecessary disk writes and file on disk with an updated "modified timestamp"
+      store.closeImmediately()
+    }
   }
 
   fun forceClose() {