启动hbase后，出现ERROR [1532177063@qtp-573102881-2] mortbay.log: /master-status java.lang.NullPointerExcep

2018-11-07 09:28:54,771 INFO  [master:16000.activeMasterManager] util.FSUtils: Waiting for dfs to exit safe mode...
2018-11-07 09:29:04,783 INFO  [master:16000.activeMasterManager] util.FSUtils: Waiting for dfs to exit safe mode...
2018-11-07 09:29:14,787 INFO  [master:16000.activeMasterManager] util.FSUtils: Waiting for dfs to exit safe mode...
2018-11-07 09:29:14,878 INFO  [master/master/192.168.251.28:16000] regionserver.HRegionServer: ClusterId : a0265097-a1f1-443d-963c-41df6b9be50a
2018-11-07 09:29:24,789 INFO  [master:16000.activeMasterManager] util.FSUtils: Waiting for dfs to exit safe mode...
2018-11-07 09:29:32,803 ERROR [1532177063@qtp-573102881-2] mortbay.log: /master-status
java.lang.NullPointerException
        at org.apache.hadoop.hbase.master.HMaster.isInMaintenanceMode(HMaster.java:2686)
        at org.apache.hadoop.hbase.tmpl.master.MasterStatusTmplImpl.renderNoFlush(MasterStatusTmplImpl.java:241)
        at org.apache.hadoop.hbase.tmpl.master.MasterStatusTmpl.renderNoFlush(MasterStatusTmpl.java:387)
        at org.apache.hadoop.hbase.tmpl.master.MasterStatusTmpl.render(MasterStatusTmpl.java:378)
        at org.apache.hadoop.hbase.master.MasterStatusServlet.doGet(MasterStatusServlet.java:81)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
        at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1221)
        at org.apache.hadoop.hbase.http.lib.StaticUserWebFilter$StaticUserFilter.doFilter(StaticUserWebFilter.java:113)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
        at org.apache.hadoop.hbase.http.ClickjackingPreventionFilter.doFilter(ClickjackingPreventionFilter.java:48)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
        at org.apache.hadoop.hbase.http.HttpServer$QuotingInputFilter.doFilter(HttpServer.java:1435)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
        at org.apache.hadoop.hbase.http.NoCacheFilter.doFilter(NoCacheFilter.java:49)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
        at org.apache.hadoop.hbase.http.NoCacheFilter.doFilter(NoCacheFilter.java:49)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
        at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:399)
        at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
        at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
        at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766)
        at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:450)
        at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230)
        at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
        at org.mortbay.jetty.Server.handle(Server.java:326)
        at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
        at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:928)
        at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:549)
        at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
        at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
        at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:410)
        at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
2018-11-07 09:29:34,792 INFO  [master:16000.activeMasterManager] util.FSUtils: Waiting for dfs to exit safe mode...
2018-11-07 09:29:44,796 INFO  [master:16000.activeMasterManager] util.FSUtils: Waiting for dfs to exit safe mode...
2018-11-07 09:29:54,800 INFO  [master:16000.activeMasterManager] util.FSUtils: Waiting for dfs to exit safe mode...
2018-11-07 09:30:04,805 INFO  [master:16000.activeMasterManager] util.FSUtils: Waiting for dfs to exit safe mode...
2018-11-07 09:30:14,809 INFO  [master:16000.activeMasterManager] util.FSUtils: Waiting for dfs to exit safe mode...
2018-11-07 09:30:24,812 INFO  [master:16000.activeMasterManager] util.FSUtils: Waiting for dfs to exit safe mode...
2018-11-07 09:30:34,815 INFO  [master:16000.activeMasterManager] util.FSUtils: Waiting for dfs to exit safe mode...
2018-11-07 09:30:44,819 INFO  [master:16000.activeMasterManager] util.FSUtils: Waiting for dfs to exit safe mode...
2018-11-07 09:30:54,823 INFO  [master:16000.activeMasterManager] util.FSUtils: Waiting for dfs to exit safe mode...
2018-11-07 09:31:04,826 INFO  [master:16000.activeMasterManager] util.FSUtils: Waiting for dfs to exit safe mode...
2018-11-07 09:31:14,830 INFO  [master:16000.activeMasterManager] util.FSUtils: Waiting for dfs to exit safe mode...
2018-11-07 09:31:24,834 INFO  [master:16000.activeMasterManager] util.FSUtils: Waiting for dfs to exit safe mode...
                                                                                                           123,1          9%

引起这种原因时hbase没有真正关闭

解决方式：

1、查看hadoop是否处于安全模式

进入hadoop的bin目录中

hadoop dfsadmin -safemode get

显示 safe mode is ON

2、将hadoop退出安全模式后再次启动hbase

hadoop dfsadmin -safemode leave