Hadoop HA 搭建hbase启动时只有HMaster起来，HRegionServer没有起来
查看报错信息为：
2019-08-31 19:17:14,212 ERROR [main] regionserver.HRegionServer: Failed construction RegionServer java.lang.IllegalArgumentException: java.net.UnknownHostException: mycluster at org.apache.hadoop.security.SecurityUtil.buildTokenService(SecurityUtil.java:417) at org.apache.hadoop.hdfs.NameNodeProxiesClient.createProxyWithClientProtocol(NameNodeProxiesClient.java:132) at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:351) at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:285) at org.apache.hadoop.hdfs.DistributedFileSystem.initialize(DistributedFileSystem.java:160) at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2812) at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:100) at org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:2849) at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2831) at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:389) at org.apache.hadoop.fs.Path.getFileSystem(Path.java:356) at org.apache.hadoop.hbase.util.CommonFSUtils.getRootDir(CommonFSUtils.java:362) at org.apache.hadoop.hbase.util.CommonFSUtils.isValidWALRootDir(CommonFSUtils.java:412) at org.apache.hadoop.hbase.util.CommonFSUtils.getWALRootDir(CommonFSUtils.java:388) at org.apache.hadoop.hbase.regionserver.HRegionServer.initializeFileSystem(HRegionServer.java:723) at org.apache.hadoop.hbase.regionserver.HRegionServer.<init>(HRegionServer.java:629) 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:3035) at org.apache.hadoop.hbase.regionserver.HRegionServerCommandLine.start(HRegionServerCommandLine.java:63) at org.apache.hadoop.hbase.regionserver.HRegionServerCommandLine.run(HRegionServerCommandLine.java:87) at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:76) at org.apache.hadoop.hbase.util.ServerCommandLine.doMain(ServerCommandLine.java:149) at org.apache.hadoop.hbase.regionserver.HRegionServer.main(HRegionServer.java:3053) Caused by: java.net.UnknownHostException: mycluster ... 26 more 2019-08-31 19:17:14,217 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:3038) at org.apache.hadoop.hbase.regionserver.HRegionServerCommandLine.start(HRegionServerCommandLine.java:63) at org.apache.hadoop.hbase.regionserver.HRegionServerCommandLine.run(HRegionServerCommandLine.java:87) at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:76) at org.apache.hadoop.hbase.util.ServerCommandLine.doMain(ServerCommandLine.java:149) at org.apache.hadoop.hbase.regionserver.HRegionServer.main(HRegionServer.java:3053) 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:3035) ... 5 more Caused by: java.lang.IllegalArgumentException: java.net.UnknownHostException: mycluster at org.apache.hadoop.security.SecurityUtil.buildTokenService(SecurityUtil.java:417) at org.apache.hadoop.hdfs.NameNodeProxiesClient.createProxyWithClientProtocol(NameNodeProxiesClient.java:132) at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:351) at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:285) at org.apache.hadoop.hdfs.DistributedFileSystem.initialize(DistributedFileSystem.java:160) at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2812) at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:100) at org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:2849) at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2831) at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:389) at org.apache.hadoop.fs.Path.getFileSystem(Path.java:356) at org.apache.hadoop.hbase.util.CommonFSUtils.getRootDir(CommonFSUtils.java:362) at org.apache.hadoop.hbase.util.CommonFSUtils.isValidWALRootDir(CommonFSUtils.java:412) at org.apache.hadoop.hbase.util.CommonFSUtils.getWALRootDir(CommonFSUtils.java:388) at org.apache.hadoop.hbase.regionserver.HRegionServer.initializeFileSystem(HRegionServer.java:723) at org.apache.hadoop.hbase.regionserver.HRegionServer.<init>(HRegionServer.java:629) ... 10 more Caused by: java.net.UnknownHostException: mycluster
由于无法找到mycluster
解决方法：
将hadoop/etc/中的 core-site.xml和hdfs-site.xml 复制到hbase的conf目录下，启动hbase就好了