完美解决java.lang.ClassNotFoundException: org.apache.htrace.SamplerBuilder

已解决java.lang.ClassNotFoundException: org.apache.htrace.SamplerBuilder

报错问题

粉丝群里面的一个小伙伴敲代码时发生了报错（当时他心里瞬间凉了一大截，跑来找我求助，然后顺利帮助他解决了，顺便记录一下希望可以帮助到更多遇到这个bug不会解决的小伙伴），报错信息如下：

java.lang.NoClassDefFoundError: org/apache/htrace/SamplerBuilder
    at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:635)
    at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:619)
    at org.apache.hadoop.hdfs.DistributedFileSystem.initialize(DistributedFileSystem.java:149)
    at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2669)
    at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:94)
    at org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:2703)
    at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2685)
    at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:373)
    at org.apache.hadoop.fs.Path.getFileSystem(Path.java:295)
    at org.apache.hadoop.hbase.util.CommonFSUtils.getRootDir(CommonFSUtils.java:358)
    at org.apache.hadoop.hbase.util.CommonFSUtils.isValidWALRootDir(CommonFSUtils.java:407)
    at org.apache.hadoop.hbase.util.CommonFSUtils.getWALRootDir(CommonFSUtils.java:383)
    at org.apache.hadoop.hbase.regionserver.HRegionServer.initializeFileSystem(HRegionServer.java:691)
    at org.apache.hadoop.hbase.regionserver.HRegionServer.<init>(HRegionServer.java:600)
    at org.apache.hadoop.hbase.master.HMaster.<init>(HMaster.java:484)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
    at org.apache.hadoop.hbase.master.HMaster.constructMaster(HMaster.java:2965)
    at org.apache.hadoop.hbase.master.HMasterCommandLine.startMaster(HMasterCommandLine.java:236)
    at org.apache.hadoop.hbase.master.HMasterCommandLine.run(HMasterCommandLine.java:140)
    at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
    at org.apache.hadoop.hbase.util.ServerCommandLine.doMain(ServerCommandLine.java:149)
    at org.apache.hadoop.hbase.master.HMaster.main(HMaster.java:2983)
Caused by: java.lang.ClassNotFoundException: org.apache.htrace.SamplerBuilder
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 25 more
2018-08-01 23:30:33,794 ERROR [main] master.HMasterCommandLine: Master exiting
java.lang.RuntimeException: Failed construction of Master: class org.apache.hadoop.hbase.master.HMaster. 
    at org.apache.hadoop.hbase.master.HMaster.constructMaster(HMaster.java:2972)
    at org.apache.hadoop.hbase.master.HMasterCommandLine.startMaster(HMasterCommandLine.java:236)
    at org.apache.hadoop.hbase.master.HMasterCommandLine.run(HMasterCommandLine.java:140)
    at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
    at org.apache.hadoop.hbase.util.ServerCommandLine.doMain(ServerCommandLine.java:149)
    at org.apache.hadoop.hbase.master.HMaster.main(HMaster.java:2983)
Caused by: java.lang.NoClassDefFoundError: org/apache/htrace/SamplerBuilder
    at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:635)
    at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:619)
    at org.apache.hadoop.hdfs.DistributedFileSystem.initialize(DistributedFileSystem.java:149)
    at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2669)
    at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:94)
    at org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:2703)
    at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2685)
    at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:373)
    at org.apache.hadoop.fs.Path.getFileSystem(Path.java:295)
    at org.apache.hadoop.hbase.util.CommonFSUtils.getRootDir(CommonFSUtils.java:358)
    at org.apache.hadoop.hbase.util.CommonFSUtils.isValidWALRootDir(CommonFSUtils.java:407)
    at org.apache.hadoop.hbase.util.CommonFSUtils.getWALRootDir(CommonFSUtils.java:383)
    at org.apache.hadoop.hbase.regionserver.HRegionServer.initializeFileSystem(HRegionServer.java:691)
    at org.apache.hadoop.hbase.regionserver.HRegionServer.<init>(HRegionServer.java:600)
    at org.apache.hadoop.hbase.master.HMaster.<init>(HMaster.java:484)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
    at org.apache.hadoop.hbase.master.HMaster.constructMaster(HMaster.java:2965)
    ... 5 more
Caused by: java.lang.ClassNotFoundException: org.apache.htrace.SamplerBuilder
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 25 more

解决方法

解决方法如下

不废话，直接说解决方案

 cp $HBASE_HOME/lib/client-facing-thirdparty/htrace-core-3.1.0-incubating.jar $HBASE_HOME/lib/

福利

每周会送6本技术书籍包邮到家
由于博主时间精力有限，每天私信人数太多，没办法每个粉丝都及时回复
大家可以进社区裙或者添加博主微信
点击下方链接即可
http://t.csdn.cn/6kInJ