DomGarguilo opened a new pull request, #4541:
URL: https://github.com/apache/accumulo/pull/4541
Fixes #4509
This PR adds two new metrics:
1. `accumulo.scan.reservation.writeout.timer` which records the amount of
time it takes for reservations to be added to the metadata table
2. `accumulo.scan.reservation.collision.count` which adds a
`FunctionCounter` that gets incremented if a scan is held up waiting for files
that are in flux
I also renamed `accumulo.scan.reservation.timer` to
`accumulo.scan.reservation.total.timer`.
I have observed the writeout timer and total timer displayed in the metrics
via logging:
```
METRICS: 2024-05-09T14:40:40,149,
accumulo.scan.reservation.total.timer{host=localhost,instance.name=uno,port=9996,process.name=sserver,resource.group=default}
throughput=1.666667/s mean=0.003309524s max=0.159866629s
METRICS: 2024-05-09T14:40:40,149,
accumulo.scan.reservation.writeout.timer{host=localhost,instance.name=uno,port=9996,process.name=sserver,resource.group=default}
throughput=0.033333/s mean=0.000017287s max=0.000017287s
```
I have not observed either the existing busy timeout counter or the new
collision counter. If anyone has an ideas on how those might be able to be
tested that would be helpful.
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