szetszwo commented on code in PR #4572:
URL: https://github.com/apache/ozone/pull/4572#discussion_r1172853424


##########
hadoop-ozone/common/src/main/java/org/apache/hadoop/ozone/om/helpers/OmMultipartKeyInfo.java:
##########
@@ -58,18 +60,19 @@ public class OmMultipartKeyInfo extends WithObjectID {
    * ------------------------------------------|
    */
   private long parentID;
+  public static final PartKeyInfo EMPTY_PART_KEY_INFO = null;
 
   /**
    * Construct OmMultipartKeyInfo object which holds multipart upload
    * information for a key.
    */
   public OmMultipartKeyInfo(String id, long creationTime,
       ReplicationConfig replicationConfig,
-      Map<Integer, PartKeyInfo> list, long objectID, long updateID) {
+      IntSparseMap<PartKeyInfo> list, long objectID, long updateID) {
     this.uploadID = id;
     this.creationTime = creationTime;
     this.replicationConfig = replicationConfig;
-    this.partKeyInfoList = new TreeMap<>(list);
+    this.partKeyInfoList = list;

Review Comment:
   > when get form RocksDB
   
   If it cannot be avoided easily, let's keep it for the moment.  Just remove 
the one in the constructor.



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