Erik Krogen created HDFS-10873:

             Summary: Add histograms for FSNamesystemLock Metrics
                 Key: HDFS-10873
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: namenode
            Reporter: Erik Krogen
            Assignee: Erik Krogen

It could be useful to have full histograms for how long operations are holding 
the namesystem lock in addition to just rate information. This will, however, 
be a large number of emitted metrics and likely require more coordination, so 
it may be best to have this be separately configurable from more simple 
namesystem lock metrics. 

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