[jira] [Created] (CASSANDRA-7177) Starting threads in the OutboundTcpConnectionPool constructor causes race conditions

["Sergio Bossa (JIRA)" <ji...@apache.org>]

Sergio Bossa created CASSANDRA-7177:
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             Summary: 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


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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