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[jira] [Created] (ARROW-4086) [Java] Add api to fetch summary of root allocator

Pindikura Ravindra created ARROW-4086:

             Summary: [Java] Add api to fetch summary of root allocator
                 Key: ARROW-4086
                 URL: https://issues.apache.org/jira/browse/ARROW-4086
             Project: Apache Arrow
          Issue Type: Task
          Components: Java
            Reporter: Pindikura Ravindra
            Assignee: Pindikura Ravindra

On allocation failures, it's useful to know where the memory is being used in the tree of allocators (for debugging). One way to do this would be by adding APIs to :
 # get root allocator from a given allocator
 # get summary of usage/limit from an allocator upto N levels (N is an input arg)

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