BELUGA BEHR created HDFS-13428:

             Summary: Remove LinkedList From
                 Key: HDFS-13428
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: federation
    Affects Versions: 3.0.1
         Environment: Replace {{LinkedList}} with {{ArrayList}} implementation 
in the StateStoreFileImpl class.  This is especially advantageous because we 
can pre-allocate the internal array before a copy occurs.  {{ArrayList}} is 
faster for iterations and requires less memory than {{LinkedList}}.

  protected List<String> getChildren(String path) {
    List<String> ret = new LinkedList<>();
    File dir = new File(path);
    File[] files = dir.listFiles();
    if (files != null) {
      for (File file : files) {
        String filename = file.getName();
    return ret;
            Reporter: BELUGA BEHR
         Attachments: HDFS-13428.1.patch

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