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  1. Sub-task HDFS-2455
    recoverTempUnlinkedBlock & addToReplicasMap can be optimized to do in single scan in FSDataset.
  2. Sub-task HDFS-1617
    CLONE to COMMON - Batch the calls in DataStorage to FileUtil.createHardLink(), so we call it once per directory instead of once per file
  3. Sub-task HDFS-1447
    Make getGenerationStampFromFile() more efficient, so it doesn't reprocess full directory listing for every block
  4. Sub-task HDFS-1446
    Refactor the start-time Directory Tree and Replicas Map constructors to share data and run volume-parallel
  5. Sub-task HDFS-1445
    Batch the calls in DataStorage to FileUtil.createHardLink(), so we call it once per directory instead of once per file
  6. Sub-task HDFS-270
    DFS Upgrade should process dfs.data.dirs in parallel
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