jinmeiliao commented on a change in pull request #5823:
URL: https://github.com/apache/geode/pull/5823#discussion_r539527585



##########
File path: 
geode-core/src/main/java/org/apache/geode/internal/cache/AbstractRegionMap.java
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@@ -1282,14 +1282,18 @@ public boolean invalidate(EntryEventImpl event, boolean 
invokeCallbacks, boolean
     DiskRegion dr = owner.getDiskRegion();
     boolean ownerIsInitialized = owner.isInitialized();
 
+    // lock before waitForIndexInit so that we should wait
+    // till a concurrent clear to finish
+    lockForCacheModification(owner, event);

Review comment:
       It would bee nice to run a full regression with this change to see if it 
will cause another hang. Right now I don't think I am fully qualified to 
explain to you on that.




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