Tim Armstrong created IMPALA-8375:
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             Summary: Add metrics for spill disk usage
                 Key: IMPALA-8375
                 URL: https://issues.apache.org/jira/browse/IMPALA-8375
             Project: IMPALA
          Issue Type: Sub-task
          Components: Backend
    Affects Versions: Impala 3.2.0
            Reporter: Tim Armstrong


* High water mark of bytes allocated
* Maybe - some metric of utilisation (what % of bytes allocated are actually 
being used)
* Maybe - total bytes allocated over the lifetime of the process
* Maybe - statistics about the sizes of blocks allocated



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