[jira] [Created] (HBASE-22948) Report region size metric as a histogram

["Nick Dimiduk (Jira)" <ji...@apache.org>]

Nick Dimiduk created HBASE-22948:
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             Summary: Report region size metric as a histogram
                 Key: HBASE-22948
                 URL: https://issues.apache.org/jira/browse/HBASE-22948
             Project: HBase
          Issue Type: Improvement
          Components: metrics
            Reporter: Nick Dimiduk


Right now we expose a metric {{Hadoop:service=HBase,name=RegionServer,sub=Server,attribute=averageRegionSize}}, which is calculated as (the sum of all {{Store#getStoreFilesSize()}} for all stores in all regions, plus the current memStore size) divided by the number of regions. We also expose under {{Hadoop:service=HBase,name=RegionServer,sub=Regions,attribute=$tableName_$region_metric_storeFileSize}}. I posit that the average size metric is too coarse-grain, yet the metric per region is too granular to be casually consumed. I propose we change the {{averageRegionSize}} to be a histogram with our standard percentiles. I suspect this change would be obliged to omit the memStore size from the calculation, but I think the memStore is adequately monitored elsewhere.



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