Michael Bingham created KAFKA-9485:
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Summary: Dynamic updates to num.recovery.threads.per.data.dir are
not applied right away
Key: KAFKA-9485
URL: https://issues.apache.org/jira/browse/KAFKA-9485
Project: Kafka
Issue Type: Improvement
Components: core, log
Affects Versions: 2.4.0
Reporter: Michael Bingham
The {{num.recovery.threads.per.data.dir}} broker property is a {{cluster-wide}}
dynamically configurable setting, but it does not appear that it would have any
dynamic effect on actual broker behavior.
The recovery thread pool is currently only created once when the {{LogManager}}
is started and the {{loadLogs()}} method is called. If this property is later
changed dynamically, it would have no effect until the broker is restarted.
This might be confusing to someone modifying this property, so perhaps should
be made more clear in the documentation, or perhaps changed to a \{{read-only}}
property. The only benefit I see to having it be a dynamic config property is
that it can be applied once for the entire cluster, instead of individually
specified in each broker's {{server.properties}} file.
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