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https://issues.apache.org/jira/browse/CASSANDRA-7177?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13997766#comment-13997766
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Jason Brown commented on CASSANDRA-7177:
----------------------------------------
Forgot to add, but successfully merged everything up on May 7 after resolving
some other merge conflict
> Starting threads in the OutboundTcpConnectionPool constructor causes race
> conditions
> ------------------------------------------------------------------------------------
>
> Key: CASSANDRA-7177
> URL: https://issues.apache.org/jira/browse/CASSANDRA-7177
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Reporter: Sergio Bossa
> Assignee: Sergio Bossa
> Fix For: 2.0.9, 2.1.0
>
> Attachments: CASSANDRA-7177-v2.patch, CASSANDRA-7177.patch
>
>
> The OutboundTcpConnectionPool starts connection threads in its constructor,
> causing race conditions when MessagingService#getConnectionPool is
> concurrently called for the first time for a given address.
> I.e., here's one of the races:
> {noformat}
> WARN 12:49:03,182 Error processing
> org.apache.cassandra.metrics:type=Connection,scope=127.0.0.1,name=CommandPendingTasks
> javax.management.InstanceAlreadyExistsException:
> org.apache.cassandra.metrics:type=Connection,scope=127.0.0.1,name=CommandPendingTasks
> at com.sun.jmx.mbeanserver.Repository.addMBean(Repository.java:437)
> at
> com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerWithRepository(DefaultMBeanServerInterceptor.java:1898)
> at
> com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerDynamicMBean(DefaultMBeanServerInterceptor.java:966)
> at
> com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerObject(DefaultMBeanServerInterceptor.java:900)
> at
> com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean(DefaultMBeanServerInterceptor.java:324)
> at
> com.sun.jmx.mbeanserver.JmxMBeanServer.registerMBean(JmxMBeanServer.java:522)
> at
> com.yammer.metrics.reporting.JmxReporter.registerBean(JmxReporter.java:464)
> at
> com.yammer.metrics.reporting.JmxReporter.processGauge(JmxReporter.java:438)
> at
> com.yammer.metrics.reporting.JmxReporter.processGauge(JmxReporter.java:16)
> at com.yammer.metrics.core.Gauge.processWith(Gauge.java:28)
> at
> com.yammer.metrics.reporting.JmxReporter.onMetricAdded(JmxReporter.java:395)
> at
> com.yammer.metrics.core.MetricsRegistry.notifyMetricAdded(MetricsRegistry.java:516)
> at
> com.yammer.metrics.core.MetricsRegistry.getOrAdd(MetricsRegistry.java:491)
> at
> com.yammer.metrics.core.MetricsRegistry.newGauge(MetricsRegistry.java:79)
> at com.yammer.metrics.Metrics.newGauge(Metrics.java:70)
> at
> org.apache.cassandra.metrics.ConnectionMetrics.<init>(ConnectionMetrics.java:71)
> at
> org.apache.cassandra.net.OutboundTcpConnectionPool.<init>(OutboundTcpConnectionPool.java:55)
> at
> org.apache.cassandra.net.MessagingService.getConnectionPool(MessagingService.java:498)
> {noformat}
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