zhouyingchao created HDFS-13700:
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             Summary: The process of loading image can be done in a pipeline 
model
                 Key: HDFS-13700
                 URL: https://issues.apache.org/jira/browse/HDFS-13700
             Project: Hadoop HDFS
          Issue Type: Improvement
            Reporter: zhouyingchao


The process of loading a file system image involves reading inodes section, 
deserializing inodes, initializing inodes, adding inodes to the global map, 
reading directories section, adding inodes to their parents' map, cache name 
etc. These steps can be done in a pipeline model to reduce the total duration. 



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