From 74af7d44268d584e47a6f40178ebcb42bb9fed8e Mon Sep 17 00:00:00 2001
From: Jinmei Liao <jiliao@pivotal.io>
Date: Mon, 28 Feb 2022 16:28:05 -0800
Subject: [PATCH] GEODE-10092: add more logging for future debug when region
 size gets below 0. (#7402)

---
 .../apache/geode/internal/cache/LocalRegion.java  | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/geode-core/src/main/java/org/apache/geode/internal/cache/LocalRegion.java b/geode-core/src/main/java/org/apache/geode/internal/cache/LocalRegion.java
index b8b585c0d9c2..0c3a396bee19 100644
--- a/geode-core/src/main/java/org/apache/geode/internal/cache/LocalRegion.java
+++ b/geode-core/src/main/java/org/apache/geode/internal/cache/LocalRegion.java
@@ -2111,9 +2111,20 @@ public int getRegionSize() {
       // if this is a client with no tombstones then we subtract the number
       // of entries being affected by register-interest refresh
       if (imageState.isClient() && !getConcurrencyChecksEnabled()) {
-        return result - imageState.getDestroyedEntriesCount();
+        int destroyedEntriesCount = imageState.getDestroyedEntriesCount();
+        if (result < destroyedEntriesCount) {
+          logger.error("Incorrect region size: mapSize={}, destroyedEntriesCount={}.", result,
+              destroyedEntriesCount);
+        }
+        return result - destroyedEntriesCount;
+      }
+
+      int tombstoneNumber = tombstoneCount.get();
+      if (result < tombstoneNumber) {
+        logger.error("Incorrect region size: mapSize={}, tombstoneCount={}.", result,
+            tombstoneNumber);
       }
-      return result - tombstoneCount.get();
+      return result - tombstoneNumber;
     }
   }