1. 启动HBase时报错
2019-11-24 18:14:29,709 ERROR [main] regionserver.HRegionServerCommandLine: Region server exiting
java.lang.RuntimeException: Failed construction of Regionserver: class org.apache.hadoop.hbase.regionserver.HRegionServer
        at org.apache.hadoop.hbase.regionserver.HRegionServer.constructRegionServer(HRegionServer.java:2652)
        at org.apache.hadoop.hbase.regionserver.HRegionServerCommandLine.start(HRegionServerCommandLine.java:64)
        at org.apache.hadoop.hbase.regionserver.HRegionServerCommandLine.run(HRegionServerCommandLine.java:87)
        at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
        at org.apache.hadoop.hbase.util.ServerCommandLine.doMain(ServerCommandLine.java:126)
        at org.apache.hadoop.hbase.regionserver.HRegionServer.main(HRegionServer.java:2667)
Caused by: java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
        at org.apache.hadoop.hbase.regionserver.HRegionServer.constructRegionServer(HRegionServer.java:2650)
        ... 5 more
Caused by: java.lang.IllegalArgumentException: java.net.UnknownHostException: supercluster
        at org.apache.hadoop.security.SecurityUtil.buildTokenService(SecurityUtil.java:373)
        at org.apache.hadoop.hdfs.NameNodeProxies.createNonHAProxy(NameNodeProxies.java:258)
        at org.apache.hadoop.hdfs.NameNodeProxies.createProxy(NameNodeProxies.java:153)
        at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:602)
        at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:547)
        at org.apache.hadoop.hdfs.DistributedFileSystem.initialize(DistributedFileSystem.java:139)
        at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2591)
        at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:89)
        at org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:2625)
        at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2607)
        at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:368)
        at org.apache.hadoop.fs.Path.getFileSystem(Path.java:296)
        at org.apache.hadoop.hbase.util.FSUtils.getRootDir(FSUtils.java:1003)
        at org.apache.hadoop.hbase.regionserver.HRegionServer.<init>(HRegionServer.java:568)
        ... 10 more
Caused by: java.net.UnknownHostException: supercluster
        ... 24 more

出现以上问题，是因为使用的是HA，没有找到host的问题
可以将hadoop目录下的etc/hadoop/中的core-site.xml和hdfs-site.xml复制到hbase的conf的目录下