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https://issues.apache.org/jira/browse/CASSANDRA-20881?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18017913#comment-18017913
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guo Maxwell commented on CASSANDRA-20881:
-----------------------------------------
Can you describe the usage scenario of this virtual table?
> make LogbackMetrics work as a virtual table
> -------------------------------------------
>
> Key: CASSANDRA-20881
> URL: https://issues.apache.org/jira/browse/CASSANDRA-20881
> Project: Apache Cassandra
> Issue Type: Bug
> Components: Observability/Metrics, Virtual Tables
> Reporter: Ling Mao
> Assignee: Ling Mao
> Priority: Normal
> Fix For: 5.0.x
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> When opening the following appender in the _*logback.xml*_
>
> {code:java}
> <appender name="LogbackMetrics"
> class="com.codahale.metrics.logback.InstrumentedAppender" />{code}
>
> then restart the cluster, we will encounter the following exceptions:
>
> {code:java}
> Caused by: java.lang.IllegalStateException: Unknown metric group:
> LogbackMetrics
> at
> org.apache.cassandra.metrics.CassandraMetricsRegistry.verifyUnknownMetric(CassandraMetricsRegistry.java:277)
> at
> org.apache.cassandra.metrics.CassandraMetricsRegistry.register(CassandraMetricsRegistry.java:411)
> at
> {code}
> This patch makes LogbackMetrics work again as a virtual table. The preview
> is:
> {code:java}
> cqlsh:system_views> select * from system_metrics.logback_metrics_group ;
>
> name | scope | type | value
> ---------------------------------------------------+-----------+-------+-------
> org.apache.cassandra.metrics.LogbackMetrics.all | undefined | meter | 1433
> org.apache.cassandra.metrics.LogbackMetrics.debug | undefined | meter | 940
> org.apache.cassandra.metrics.LogbackMetrics.error | undefined | meter | 0
> org.apache.cassandra.metrics.LogbackMetrics.info | undefined | meter | 483
> org.apache.cassandra.metrics.LogbackMetrics.trace | undefined | meter | 0
> org.apache.cassandra.metrics.LogbackMetrics.warn | undefined | meter | 10
> {code}
>
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