启动HBASE，java.lang.ClassNotFoundException: org.apache.htrace.SamplerBuilder

Question

我尝试使用start-hbase.sh启动HBASE，但是，我得到了错误：java.lang.ClassNotFoundException: org.apache.htrace.SamplerBuilder.

我试着把不同的.jar添加到不同的文件夹中(如其他帖子所建议的)，但是都不起作用。我使用的是hadoop3.11和hadoop2.10，这里是错误日志(结尾)。

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$Cache.get(FileSystem.java:2685)
    at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:373)
    at org.apache.hadoop.fs.Path.getFileSystem(Path.java:295)
    at org.apache.hadoop.hbase.util.CommonFSUtils.getRootDir(CommonFSUtils.java:358)
    at org.apache.hadoop.hbase.util.CommonFSUtils.isValidWALRootDir(CommonFSUtils.java:407)
    at org.apache.hadoop.hbase.util.CommonFSUtils.getWALRootDir(CommonFSUtils.java:383)
    at org.apache.hadoop.hbase.regionserver.HRegionServer.initializeFileSystem(HRegionServer.java:691)
    at org.apache.hadoop.hbase.regionserver.HRegionServer.<init>(HRegionServer.java:600)
    at org.apache.hadoop.hbase.master.HMaster.<init>(HMaster.java:484)
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:488)
    at org.apache.hadoop.hbase.master.HMaster.constructMaster(HMaster.java:2965)
    ... 5 more
Caused by: java.lang.ClassNotFoundException: org.apache.htrace.SamplerBuilder
    at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:582)
    at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:190)
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:499)
    ... 25 more

Answer 1

Apache2.1.0版本使用了HTrace，这是一个孵化中的HBase基金会项目。

在HBase lib文件夹client-facing-thirdparty中有一个用于第三方库的文件夹。您需要将库中的htrace-core-3.1.0-incubating.jar复制到HBase库目录中。(see reference)

在Cloudera Community还有另一个解决方案，可以更改配置而不是手动添加库。

Answer 2

Hbase和Hadoop之间似乎存在兼容性问题，我恢复使用Hadoop 2.9.1和Hbase 1.2.6以及JDK 1.8.0

Answer 3

HBase 2.1.4在client-facing-thirdparty中没有htrace-core-3.1.0-incubating.jar

您需要从2.1.3复制或从https://mvnrepository.com/artifact/org.apache.htrace/htrace-core下载