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java.util.concurrent.RejectedExecutionException: 	at java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(ThreadPoolExecutor.java:1774)	at java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:768)	at java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:656)	at com.google.common.util.concurrent.MoreExecutors$ListeningDecorator.execute(MoreExecutors.java:484)	at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:78)	at com.google.common.util.concurrent.AbstractListeningExecutorService.submit(AbstractListeningExecutorService.java:50)	at com.datastax.driver.core.Cluster$Manager.triggerOnDown(Cluster.java:1342)	at com.datastax.driver.core.Cluster$Manager.signalConnectionFailure(Cluster.java:1550)	at com.datastax.driver.core.Connection.defunct(Connection.java:247)	at com.datastax.driver.core.Connection$Dispatcher.exceptionCaught(Connection.java:612)	at org.jboss.netty.handler.codec.oneone.OneToOneDecoder.handleUpstream(OneToOneDecoder.java:60)	at org.jboss.netty.handler.codec.frame.FrameDecoder.exceptionCaught(FrameDecoder.java:377)	at org.jboss.netty.channel.Channels.fireExceptionCaught(Channels.java:525)	at org.jboss.netty.channel.socket.nio.NioClientSocketPipelineSink.connect(NioClientSocketPipelineSink.java:131)	at org.jboss.netty.channel.socket.nio.NioClientSocketPipelineSink.eventSunk(NioClientSocketPipelineSink.java:70)	at org.jboss.netty.handler.codec.oneone.OneToOneEncoder.handleDownstream(OneToOneEncoder.java:54)	at org.jboss.netty.handler.codec.oneone.OneToOneEncoder.handleDownstream(OneToOneEncoder.java:54)	at org.jboss.netty.channel.Channels.connect(Channels.java:634)	at org.jboss.netty.channel.AbstractChannel.connect(AbstractChannel.java:207)	at org.jboss.netty.bootstrap.ClientBootstrap.connect(ClientBootstrap.java:229)	at org.jboss.netty.bootstrap.ClientBootstrap.connect(ClientBootstrap.java:182)	at com.datastax.driver.core.Connection.(Connection.java:93)	at com.datastax.driver.core.PooledConnection.(PooledConnection.java:28)	at com.datastax.driver.core.Connection$Factory.open(Connection.java:456)	at com.datastax.driver.core.HostConnectionPool.(HostConnectionPool.java:85)	at com.datastax.driver.core.SessionManager$2.call(SessionManager.java:190)	at com.datastax.driver.core.SessionManager$2.call(SessionManager.java:186)	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)	at java.util.concurrent.FutureTask.run(FutureTask.java:138)	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)	at java.lang.Thread.run(Thread.java:662)