Adam Zegelin created CASSANDRA-14819:
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Summary: Certain table metrics not released when table is dropped.
Key: CASSANDRA-14819
URL: https://issues.apache.org/jira/browse/CASSANDRA-14819
Project: Cassandra
Issue Type: Bug
Components: Metrics
Reporter: Adam Zegelin
Attachments: release-metrics.patch
The following metrics are not released when a table is dropped:
* {{CasCommitLatency}}
* {{CasCommitTotalLatency}}
* {{CasPrepareLatency}}
* {{CasPrepareTotalLatency}}
* {{CasProposeLatency}}
* {{CasProposeTotalLatency}}
* {{ReadRepairRequests}}
* {{ShortReadProtectionRequests}}
This can be verified by inspecting the list of exported MBeans after creating a
table then dropping it.
The result is that if a table with the same name is re-created then the above
metrics wont be updated - internally a
{{javax.management.InstanceAlreadyExistsException}} is thrown by the
{{MBeanServer}} and this exception is silently ignored by
{{org.apache.cassandra.metrics.CassandraMetricsRegistry#registerMBean}}
The above metrics were added in 2014/2015, so this issue probably affects all
versions released since then.
Attached a patch that releases/removes the metrics when the table is dropped.
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