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java.nio.channels.CancelledKeyException: 	at sun.nio.ch.SelectionKeyImpl.ensureValid(SelectionKeyImpl.java:55)	at sun.nio.ch.SelectionKeyImpl.interestOps(SelectionKeyImpl.java:59)	at org.apache.zookeeper.server.NIOServerCnxn.sendBuffer(NIOServerCnxn.java:418)	at org.apache.zookeeper.server.NIOServerCnxn.sendResponse(NIOServerCnxn.java:1509)	at org.apache.zookeeper.server.FinalRequestProcessor.processRequest(FinalRequestProcessor.java:367)	at org.apache.zookeeper.server.SyncRequestProcessor.flush(SyncRequestProcessor.java:161)	at org.apache.zookeeper.server.SyncRequestProcessor.run(SyncRequestProcessor.java:98)