org.apache.zookeeper.KeeperException$NodeExistsException: KeeperErrorCode = NodeExists

[RebornHuan]

We ran into this problem in our own application and i can not find why this could happen (see below)

/workersMonitor : checkExist
/workers : checkExist
/workers/10.24.76.52 : node not exit
/workers/10.24.76.52/state : node not exit
2015-03-31 09:23:35,768 ERROR [main] zookeeper.ZookeeperService (ZookeeperService.java:startWorker(331)) - Worker Register Error Happen, Maker Sure Zookeeper Server Can Be Connected
org.apache.zookeeper.KeeperException$NodeExistsException: KeeperErrorCode = NodeExists for /workers/10.24.76.52/state
at org.apache.zookeeper.KeeperException.create(KeeperException.java:119)
at org.apache.zookeeper.KeeperException.create(KeeperException.java:51)
at org.apache.zookeeper.ZooKeeper.create(ZooKeeper.java:783)
at org.apache.curator.framework.imps.CreateBuilderImpl$11.call(CreateBuilderImpl.java:688)
at org.apache.curator.framework.imps.CreateBuilderImpl$11.call(CreateBuilderImpl.java:672)
at org.apache.curator.RetryLoop.callWithRetry(RetryLoop.java:107)
at org.apache.curator.framework.imps.CreateBuilderImpl.pathInForeground(CreateBuilderImpl.java:668)
at org.apache.curator.framework.imps.CreateBuilderImpl.protectedPathInForeground(CreateBuilderImpl.java:453)
at org.apache.curator.framework.imps.CreateBuilderImpl.forPath(CreateBuilderImpl.java:443)
at org.apache.curator.framework.imps.CreateBuilderImpl.forPath(CreateBuilderImpl.java:44)
at com.suning.cybertron.superion.worker.containermanager.zookeeper.ZookeeperClient.writeData(ZookeeperClient.java:123)
at com.suning.cybertron.superion.worker.containermanager.zookeeper.ZookeeperClient.makeDir(ZookeeperClient.java:152)
at com.suning.cybertron.superion.worker.containermanager.zookeeper.ZookeeperService.startWorker(ZookeeperService.java:315)
at com.suning.cybertron.superion.worker.containermanager.zookeeper.ZookeeperService.serviceStart(ZookeeperService.java:86)
at org.apache.hadoop.service.AbstractService.start(AbstractService.java:193)
at org.apache.hadoop.service.CompositeService.serviceStart(CompositeService.java:121)
at com.suning.cybertron.superion.worker.containermanager.ContainerManagerImpl.serviceStart(ContainerManagerImpl.java:230)
at org.apache.hadoop.service.AbstractService.start(AbstractService.java:193)
at org.apache.hadoop.service.CompositeService.serviceStart(CompositeService.java:121)
at com.suning.cybertron.superion.worker.Worker.serviceStart(Worker.java:143)
at org.apache.hadoop.service.AbstractService.start(AbstractService.java:193)
at com.suning.cybertron.superion.worker.Worker.initAndStartNodeManager(Worker.java:182)
at com.suning.cybertron.superion.worker.Worker.main(Worker.java:227)

[RebornHuan]

        LOG.info("Start With Worker IP:" + this.workerIP);

        this.client.makeDir(SuperionConstant.ZOOKEEPER_WORKER_MONITOR_PATH);
        this.client.makeDir(SuperionConstant.ZOOKEEPER_WORKER_PATH);

        this.workerMonitorPath = SuperionConstant.ZOOKEEPER_WORKER_MONITOR_PATH + "/" + this.workerIP;
        /** Ephemeral Node: /workersMonitor/192.168.0.2 */
        this.client.createEphemeralNode(this.workerMonitorPath);


        this.workerPath = SuperionConstant.ZOOKEEPER_WORKER_PATH + "/" + this.workerIP;
        /** worker Node: /workers/192.168.0.2 */
        this.client.makeDir(this.workerPath);

        String workerStatePath = this.workerPath + "/" + "state";
        /** Persistent Node:  /workers/192.168.0.2/state */
        this.client.makeDir(workerStatePath);

        /** Persistent Node:  /workers/192.168.0.2/state/ProcessID */
        String workerStatePidPath = workerStatePath + "/" + "ProcessID";
        this.client.writeInt32(workerStatePidPath, workerPID);

        //this.client.makeDir(SuperionConstant.ZOOKEEPER_JOB_PATH);
        /** Persistent Node: /jobs/tmp   */
        this.client.makeDir(SuperionConstant.ZOOKEEPER_JOB_TMP_PATH);
        /** Persistent Node: /jobs/state   */
        this.client.makeDir(SuperionConstant.ZOOKEEPER_JOB_STATE_PATH);

[RebornHuan]

public synchronized void writeData(String path,byte data[]) throws Exception {
    if(this.client.checkExists().forPath(path)!=null) {
        //node exit
        System.out.println(path+"  : checkExist");
        this.client.setData().forPath(path, data);
    } else {
        //node not exit, create new
        System.out.println(path+ "  : node not exit");

        this.client.create().creatingParentsIfNeeded()
        .withMode(CreateMode.PERSISTENT).forPath(path, data);
    }
}

我在dubbox（alibaba-dubbo.2.8.4）升级的过程中也碰到了这个异常org.apache.zookeeper.KeeperException$NodeExistsException:KeeperErrorCode= NodeExists for ........，始终无法解决啊。请问这个异常怎么解决，有人有解决方案吗？