kirklund commented on a change in pull request #5014:
URL: https://github.com/apache/geode/pull/5014#discussion_r419567544



##########
File path: 
geode-core/src/main/java/org/apache/geode/internal/cache/GemFireCacheImpl.java
##########
@@ -1086,6 +1088,27 @@ public static GemFireCacheImpl getForPdx(String reason) {
     clientMetadataService = clientMetadataServiceFactory.apply(this);
   }
 
+  @Override
+  public void lockDiskStore(String diskStoreName) {
+    CountDownLatch countDownLatch =
+        diskStoreLatches.putIfAbsent(diskStoreName, new CountDownLatch(1));
+    if (countDownLatch != null) {
+      try {
+        countDownLatch.await();

Review comment:
       `putIfAbsent` returns the old value (if any) or null. Are you trying to 
await() on the old Latch or the new one you just put in the ConcurrentMap?




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