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  1. Hadoop HDFS
  2. HDFS-16197

Simplify getting NNStorage in FSNamesystem

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      In FSNamesystem, there are many places where NNStorage needs to be used (according to preliminary statistics, there are 15 times), and these places are obtained using "getFSImage().getStorage()". We should try to use a simpler way.

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            jianghuazhu JiangHua Zhu Assign to me
            jianghuazhu JiangHua Zhu
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