Hbase master启动报错：
java.lang.RuntimeException: Failed construction of Master: class org.apache.hadoop.hbase.master.HMaster
at org.apache.hadoop.hbase.master.HMaster.constructMaster(HMaster.java:2893)
at org.apache.hadoop.hbase.master.HMasterCommandLine.startMaster(HMasterCommandLine.java:186)
at org.apache.hadoop.hbase.master.HMasterCommandLine.run(HMasterCommandLine.java:135)
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.master.HMaster.main(HMaster.java:2907)
Caused by: java.net.UnknownHostException: nameservice
at org.apache.hadoop.security.SecurityUtil.buildTokenService(SecurityUtil.java:380)
at org.apache.hadoop.hdfs.NameNodeProxies.createNonHAProxy(NameNodeProxies.java:259)
at org.apache.hadoop.hdfs.NameNodeProxies.createProxy(NameNodeProxies.java:153)
at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:547)
at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:492)
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:2643)
at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2625)
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:941)
at org.apache.hadoop.hbase.master.HMaster.<init>(HMaster.java:537)
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.hbase.master.HMaster.constructMaster(HMaster.java:2888)
... 5 more
报错原因是hbase找不到hdfs的nameservice。
解决方法，在hbase的启动CLASSPATH中加入hdfs的配置文件的路径，core-site.xml和hdfs-site.xml。
如果是在docker中启动，还需要将hdfs的配置文件的路径挂载出来：
mountPath: /var/log/hbase
hostPath: /var/log/hbase