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https://issues.apache.org/jira/browse/CASSANDRA-14888?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17129384#comment-17129384
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Caleb Rackliffe commented on CASSANDRA-14888:
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Finished looking at the tests, and had a couple minor comments:
1.) {{TableMetricsTest#testMetricsCleanupOnDrop()}} already uses
{{recreateTable()}}, so you might be able to get away with using a descriptive
static name for the table.
2.) We might not need {{OrderedJUnit4ClassRunner}} in {{KeyspaceMetricsTest}}.
3.) {{KeyspaceMetricsTest#registerUnregister()}} could perhaps be renamed
{{testMetricsCleanupOnDrop()}} to follow the pattern from {{TableMetricsTest}}.
4.) Echoing [~cnlwsu]'s earlier suggestion, a brief test around un-registering
MV metrics (ex. in {{ViewWriteMetrics}}) would be a good idea. (The number of
metrics there is small, so I don't expect we'd need to add any more complex
machinery for that. The unit test would catch leaks going forward...)
Otherwise, this patch looks like a nice step in the right direction.
> Several mbeans are not unregistered when dropping a keyspace and table
> ----------------------------------------------------------------------
>
> Key: CASSANDRA-14888
> URL: https://issues.apache.org/jira/browse/CASSANDRA-14888
> Project: Cassandra
> Issue Type: Bug
> Components: Observability/Metrics
> Reporter: Ariel Weisberg
> Assignee: Alex Deparvu
> Priority: Urgent
> Labels: patch-available
> Fix For: 4.0-beta
>
> Attachments: CASSANDRA-14888.patch
>
>
> CasCommit, CasPrepare, CasPropose, ReadRepairRequests,
> ShortReadProtectionRequests, AntiCompactionTime, BytesValidated,
> PartitionsValidated, RepairPrepareTime, RepairSyncTime,
> RepairedDataInconsistencies, ViewLockAcquireTime, ViewReadTime,
> WriteFailedIdealCL
> Basically for 3 years people haven't known what they are doing because the
> entire thing is kind of obscure. Fix it and also add a dtest that detects if
> any mbeans are left behind after dropping a table and keyspace.
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