今天啟動hbase的時候報錯：

ERROR: org.apache.hadoop.hbase.ipc.ServerNotRunningYetException: Server is not running yet
	at org.apache.hadoop.hbase.master.HMaster.checkServiceStarted(HMaster.java:2261)
	at org.apache.hadoop.hbase.master.MasterRpcServices.isMasterRunning(MasterRpcServices.java:930)
	at org.apache.hadoop.hbase.protobuf.generated.MasterProtos$MasterService$2.callBlockingMethod(MasterProtos.java:55654)
	at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2180)
	at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:112)
	at org.apache.hadoop.hbase.ipc.RpcExecutor.consumerLoop(RpcExecutor.java:133)
	at org.apache.hadoop.hbase.ipc.RpcExecutor$1.run(RpcExecutor.java:108)
	at java.lang.Thread.run(Thread.java:748)
 

這種情況是由於不正常的關閉hadoop，從而導致hadoop進入了安全模式產生的原因。

解決方案：讓hadoop退出安全模式

hadoop dfsadmin -safemode leave