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java.util.concurrent.RejectedExecutionException: Worker has already been shutdown
java.util.concurrent.RejectedExecutionException: Worker has already been shutdown	at org.jboss.netty.channel.socket.nio.AbstractNioSelector.registerTask(AbstractNioSelector.java:115)	at org.jboss.netty.channel.socket.nio.AbstractNioSelector.register(AbstractNioSelector.java:100)	at org.jboss.netty.channel.socket.nio.NioClientBoss.register(NioClientBoss.java:42)	at org.jboss.netty.channel.socket.nio.NioClientSocketPipelineSink.connect(NioClientSocketPipelineSink.java:121)	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 org.apache.tajo.rpc.NettyClientBase.connect(NettyClientBase.java:76)