Andrew Purtell created HBASE-22459:
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Summary: Expose store reader reference count
Key: HBASE-22459
URL: https://issues.apache.org/jira/browse/HBASE-22459
Project: HBase
Issue Type: Improvement
Components: HFile, metrics, regionserver
Reporter: Andrew Purtell
Assignee: Andrew Purtell
Fix For: 3.0.0, 1.5.0, 2.3.0
Expose the reference count over a region's store file readers as a metric in
region metrics and also as a new field in RegionLoad. This will make visible
the reader reference count over all stores in the region to both metrics
capture and anything that consumes ClusterStatus, like the shell's status
command and the master UI.
Coprocessors that wrap scanners might leak them, which will leak readers. We
log when this happens but in order to notice the increasing trend of reference
counts you have to scrape log output. It would be better if this information is
also available as a metric.
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