keith-turner opened a new issue #2271:
URL: https://github.com/apache/accumulo/issues/2271
**Is your feature request related to a problem? Please describe.**
Accumulo has a lot of user configurable threads pools. While looking into
#1749 the following thread pool related properties were found.
```
compaction.coordinator.compaction.finalizer.threads.maximum
compaction.coordinator.threads.minimum
compactor.threads.minimum
gc.threads.delete
manager.bulk.threadpool.size
manager.fate.threadpool.size
manager.rename.threadpool.size
manager.replication.coordinator.minthreads
manager.server.threads.minimum
manager.status.threadpool.size
replication.worker.threads
tserver.assignment.concurrent.max
tserver.bloom.load.concurrent.max
tserver.bulk.assign.threads
tserver.bulk.process.threads
tserver.compaction.minor.concurrent.max
tserver.scan.executors.default.threads
tserver.scan.executors.meta.threads
tserver.workq.threads
tserver.wal.sort.concurrent.max
tserver.summary.partition.threads
tserver.summary.remote.threads
tserver.summary.retrieval.threads
tserver.server.threads.minimum
```
It would be very useful if each of these thread pools generated metrics on
at least the number of task queued and running. Other metrics per thread pool
like runtime and queue time stats may also be nice.
The compaction threads pools introduced in 2.1.0-SNAPSHOT have metrics for
each thread pool. These metrics are very useful in adjusting the compaction
thread pool configuration as explained in this [blog
post](https://accumulo.apache.org/blog/2021/07/08/external-compactions.html).
**Describe the solution you'd like**
* Centralize thread pool metrics functionality in the code, possibly
building on the work done in #1818. Try to make all code creating thread pools
from a user property use the same code for metrics instrumentation of the
thread pool.
* Makes it easy to relate the metrics to the property. Not sure if this is
possible to accomplish.
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