研发环境下搭建了一套基于CDH5的大数据平台。在重启服务器后发现HBase组件启动异常，如图
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HBase Master 运行状况不良 RegionServer运行状况不良 所有的RegionServer角色全部停止，启动时报错。
查看角色日志
Master rejected startup because clock is out of sync org.apache.hadoop.hbase.ClockOutOfSyncException: org.apache.hadoop.hbase.ClockOutOfSyncException: Server bigdata-182.bigdata.com,60020,1480383610272 has been rejected; Reported time is too far out of sync with master. Time difference of 76489ms > max allowed of 30000ms at org.apache.hadoop.hbase.master.ServerManager.checkClockSkew(ServerManager.java:401) at org.apache.hadoop.hbase.master.ServerManager.regionServerStartup(ServerManager.java:267) at org.apache.hadoop.hbase.master.MasterRpcServices.regionServerStartup(MasterRpcServices.java:366) at org.apache.hadoop.hbase.protobuf.generated.RegionServerStatusProtos$RegionServerStatusService$2.callBlockingMethod(RegionServerStatusProtos.java:8615) at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2170) at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:109) at org.apache.hadoop.hbase.ipc.RpcExecutor.consumerLoop(RpcExecutor.java:133) at org.apache.hadoop.hbase.ipc.RpcExecutor$1.run(RpcExecutor.java:108) at java.lang.Thread.run(Thread.java:745) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:526) at org.apache.hadoop.ipc.RemoteException.instantiateException(RemoteException.java:106) at org.apache.hadoop.ipc.RemoteException.unwrapRemoteException(RemoteException.java:95) at org.apache.hadoop.hbase.protobuf.ProtobufUtil.getRemoteException(ProtobufUtil.java:327) at org.apache.hadoop.hbase.regionserver.HRegionServer.reportForDuty(HRegionServer.java:2297) at org.apache.hadoop.hbase.regionserver.HRegionServer.run(HRegionServer.java:914) at java.lang.Thread.run(Thread.java:745) Caused by: org.apache.hadoop.hbase.ipc.RemoteWithExtrasException(org.apache.hadoop.hbase.ClockOutOfSyncException): org.apache.hadoop.hbase.ClockOutOfSyncException: Server bigdata-182.bigdata.com,60020,1480383610272 has been rejected; Reported time is too far out of sync with master. Time difference of 76489ms > max allowed of 30000ms at org.apache.hadoop.hbase.master.ServerManager.checkClockSkew(ServerManager.java:401) at org.apache.hadoop.hbase.master.ServerManager.regionServerStartup(ServerManager.java:267) at org.apache.hadoop.hbase.master.MasterRpcServices.regionServerStartup(MasterRpcServices.java:366) at org.apache.hadoop.hbase.protobuf.generated.RegionServerStatusProtos$RegionServerStatusService$2.callBlockingMethod(RegionServerStatusProtos.java:8615) at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2170) at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:109) 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:745)
判断可能是时间未同步导致，查看后台时间发现master主机与其他节点主机相差1分钟，重新同步时间后再次启动HBase后问题解决。
建议将时间同步加入到定时任务中，每隔一段时间向时间服务器同步一次，防止因为集群节点时间不同步导致一些异常的问题。
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