arp7 commented on a change in pull request #89: HDDS-2322. DoubleBuffer flush 
termination and OM shutdown's after that. Make entry returned from cache a new 
copy.
URL: https://github.com/apache/hadoop-ozone/pull/89#discussion_r340312109
 
 

 ##########
 File path: 
hadoop-ozone/common/src/main/java/org/apache/hadoop/ozone/om/helpers/OmKeyInfo.java
 ##########
 @@ -288,7 +289,17 @@ public Builder setKeyName(String key) {
 
     public Builder setOmKeyLocationInfos(
         List<OmKeyLocationInfoGroup> omKeyLocationInfoList) {
-      this.omKeyLocationInfoGroups = omKeyLocationInfoList;
+      if (omKeyLocationInfoList != null) {
 
 Review comment:
   Why can this be null? Is it straightforward to replace null with 
`Collections.emptyList()` in caller? Generally good to avoid nulls.

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