Colin Patrick McCabe created HDFS-5651:
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             Summary: remove dfs.namenode.caching.enabled
                 Key: HDFS-5651
                 URL: https://issues.apache.org/jira/browse/HDFS-5651
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: namenode
    Affects Versions: 3.0.0
            Reporter: Colin Patrick McCabe
            Assignee: Colin Patrick McCabe


We can remove dfs.namenode.caching.enabled and simply always enable caching, 
similar to how we do with snapshots and other features.  The main overhead is 
the size of the cachedBlocks GSet.  However, we can simply make the size of 
this GSet configurable, and people who don't want caching can set it to a very 
small value.



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