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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