hbase的master启动后过一会消失提示如下错误

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org.apache.hadoop.hbase.TableExistsException: hbase:namespace
        at org.apache.hadoop.hbase.master.handler.CreateTableHandler.checkAndSetEnablingTable(CreateTableHandler.java:151)
        at org.apache.hadoop.hbase.master.handler.CreateTableHandler.prepare(CreateTableHandler.java:124)
        at org.apache.hadoop.hbase.master.TableNamespaceManager.createNamespaceTable(TableNamespaceManager.java:233)
        at org.apache.hadoop.hbase.master.TableNamespaceManager.start(TableNamespaceManager.java:86)
        at org.apache.hadoop.hbase.master.HMaster.initNamespace(HMaster.java:787)
        at org.apache.hadoop.hbase.master.HMaster.finishActiveMasterInitialization(HMaster.java:641)
        at org.apache.hadoop.hbase.master.HMaster.access$500(HMaster.java:157)
        at org.apache.hadoop.hbase.master.HMaster$1.run(HMaster.java:1332)
        at java.lang.Thread.run(Thread.java:745)
2018-09-05 23:34:31,198 FATAL [mini:16020.activeMasterManager] master.HMaster: Master server abort: loaded coprocessors are: []
2018-09-05 23:34:31,198 FATAL [mini:16020.activeMasterManager] master.HMaster: Unhandled exception. Starting shutdown.
org.apache.hadoop.hbase.TableExistsException: hbase:namespace
        at org.apache.hadoop.hbase.master.handler.CreateTableHandler.checkAndSetEnablingTable(CreateTableHandler.java:151)
        at org.apache.hadoop.hbase.master.handler.CreateTableHandler.prepare(CreateTableHandler.java:124)
        at org.apache.hadoop.hbase.master.TableNamespaceManager.createNamespaceTable(TableNamespaceManager.java:233)
        at org.apache.hadoop.hbase.master.TableNamespaceManager.start(TableNamespaceManager.java:86)
        at org.apache.hadoop.hbase.master.HMaster.initNamespace(HMaster.java:787)
        at org.apache.hadoop.hbase.master.HMaster.finishActiveMasterInitialization(HMaster.java:641)
        at org.apache.hadoop.hbase.master.HMaster.access$500(HMaster.java:157)
        at org.apache.hadoop.hbase.master.HMaster$1.run(HMaster.java:1332)
        at java.lang.Thread.run(Thread.java:745)

原因：由于hbase非正常启动，在zookeeper上没有把相应的/hbase节点注销，所以再次启动会报上面的错。解决方案：

登录zookeeper，删除/hbase节点。

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[root@centOS1 conf]# zkCli.sh [zk: localhost:2181(CONNECTED) 9] ls / [hadoop-ha, hbase, zookeeper] [zk: localhost:2181(CONNECTED) 11] delete /hbase Node not empty: /hbase [zk: localhost:2181(CONNECTED) 12] rmr /hbase [zk: localhost:2181(CONNECTED) 13] ls / [hadoop-ha, zookeeper]