ZhangHB created HDFS-16909:
------------------------------

             Summary: Make judging null statment out from for loop in 
ReplicaMap#mergeAll method.
                 Key: HDFS-16909
                 URL: https://issues.apache.org/jira/browse/HDFS-16909
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: datanode
    Affects Versions: 3.3.4
            Reporter: ZhangHB


Currently, the code is as below:
{code:java}
for (ReplicaInfo replicaInfo : replicaSet) {
  checkBlock(replicaInfo);
  if (curSet == null) {
    // Add an entry for block pool if it does not exist already
    curSet = new LightWeightResizableGSet<>();
    map.put(bp, curSet);
  }
  curSet.put(replicaInfo);
} {code}
the statment :
{code:java}
if(curSet == null){code}
should be moved to outside from the for loop.



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