[89-fb] Fix per-store metrics aggregation
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Key: HBASE-4686
URL: https://issues.apache.org/jira/browse/HBASE-4686
Project: HBase
Issue Type: Bug
Reporter: Mikhail Bautin
Assignee: Mikhail Bautin
In r1182034 per-Store metrics were broken, because the aggregation of StoreFile
metrics over all stores in a region was replaced by overriding them every time.
We saw these metrics drop by a factor of numRegions on a production cluster --
thanks to Kannan for noticing this! We need to fix the metrics and add a unit
test to ensure regressions like this don't happen in the future.
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