Bryan Beaudreault created HBASE-26731:
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Summary: Metrics for tracking of active scanners
Key: HBASE-26731
URL: https://issues.apache.org/jira/browse/HBASE-26731
Project: HBase
Issue Type: Improvement
Reporter: Bryan Beaudreault
Assignee: Bryan Beaudreault
Active scanners take up resources on the RegionServer. This can result in GC
issues or even OOMs in cases of leaked scanners. It'd be helpful to have
metrics for tracking scanners. I was thinking of three:
* activeScanners - a gauge, showing the number of active scanners at a point
in time
* scannerLeaseExpirations - a counter of lease expirations
* scannerOldestLeastAge - a gauge with the age of the oldest least
The first one would be incremented and decremented as scanners are opened and
closed. The last two would be integrated into the LeaseManager's run loop.
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