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java.nio.channels.CancelledKeyException: 	at sun.nio.ch.SelectionKeyImpl.ensureValid(SelectionKeyImpl.java:73)	at sun.nio.ch.SelectionKeyImpl.interestOps(SelectionKeyImpl.java:77)	at org.apache.zookeeper.server.NIOServerCnxn.sendBuffer(NIOServerCnxn.java:151)	at org.apache.zookeeper.server.NIOServerCnxn.sendResponse(NIOServerCnxn.java:1082)	at org.apache.zookeeper.server.NIOServerCnxn.process(NIOServerCnxn.java:1119)	at org.apache.zookeeper.server.WatchManager.triggerWatch(WatchManager.java:120)	at org.apache.zookeeper.server.WatchManager.triggerWatch(WatchManager.java:92)	at org.apache.zookeeper.server.DataTree.setData(DataTree.java:620)	at org.apache.zookeeper.server.DataTree.processTxn(DataTree.java:807)	at org.apache.zookeeper.server.ZKDatabase.processTxn(ZKDatabase.java:329)	at org.apache.zookeeper.server.ZooKeeperServer.processTxn(ZooKeeperServer.java:1026)	at org.apache.zookeeper.server.FinalRequestProcessor.processRequest(FinalRequestProcessor.java:116)	at org.apache.zookeeper.server.SyncRequestProcessor.flush(SyncRequestProcessor.java:200)	at org.apache.zookeeper.server.SyncRequestProcessor.run(SyncRequestProcessor.java:131)