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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