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  1. Hadoop HDFS
  2. HDFS-13812

Fix the inconsistent default refresh interval on Caching documentation

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      dfs.namenode.path.based.cache.refresh.interval.ms

      The NameNode will use this as the amount of milliseconds between subsequent path cache rescans. This calculates the blocks to cache and each DataNode containing a replica of the block that should cache it.

      By default, this parameter is set to 300000, which is five minutes.

      https://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-hdfs/CentralizedCacheManagement.html

      However, this default value was change in HDFS-6106 to 30 seconds. Please update docs.

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            hgadre Hrishikesh Gadre Assign to me
            belugabehr David Mollitor
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