Failed construction RegionServer

构建HBase集群最后启动HMaster时报错Failed construction RegionServer，如下。

2019-12-23 20:05:52,682 ERROR [main] regionserver.HRegionServer: Failed construction RegionServer
java.lang.NoClassDefFoundError: org/apache/htrace/SamplerBuilder
        at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:644)
        at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:628)
        at org.apache.hadoop.hdfs.DistributedFileSystem.initialize(DistributedFileSystem.java:149)
        at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2667)
        at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:93)
        at org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:2701)
        at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2683)
        at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:372)
        at org.apache.hadoop.fs.Path.getFileSystem(Path.java:295)
        at org.apache.hadoop.hbase.util.CommonFSUtils.getRootDir(CommonFSUtils.java:362)
        at org.apache.hadoop.hbase.util.CommonFSUtils.isValidWALRootDir(CommonFSUtils.java:411)
        at org.apache.hadoop.hbase.util.CommonFSUtils.getWALRootDir(CommonFSUtils.java:387)
        at org.apache.hadoop.hbase.regionserver.HRegionServer.initializeFileSystem(HRegionServer.java:704)
        at org.apache.hadoop.hbase.regionserver.HRegionServer.<init>(HRegionServer.java:613)
        at org.apache.hadoop.hbase.master.HMaster.<init>(HMaster.java:489)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
        at org.apache.hadoop.hbase.master.HMaster.constructMaster(HMaster.java:3093)
        at org.apache.hadoop.hbase.master.HMasterCommandLine.startMaster(HMasterCommandLine.java:236)
        at org.apache.hadoop.hbase.master.HMasterCommandLine.run(HMasterCommandLine.java:140)
        at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
        at org.apache.hadoop.hbase.util.ServerCommandLine.doMain(ServerCommandLine.java:149)
        at org.apache.hadoop.hbase.master.HMaster.main(HMaster.java:3111)
Caused by: java.lang.ClassNotFoundException: org.apache.htrace.SamplerBuilder
        at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        ... 25 more
2019-12-23 20:05:52,684 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:3100)
        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:3111)
Caused by: java.lang.NoClassDefFoundError: org/apache/htrace/SamplerBuilder
        at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:644)
        at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:628)
        at org.apache.hadoop.hdfs.DistributedFileSystem.initialize(DistributedFileSystem.java:149)
        at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2667)
        at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:93)
        at org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:2701)
        at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2683)
        at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:372)
        at org.apache.hadoop.fs.Path.getFileSystem(Path.java:295)
        at org.apache.hadoop.hbase.util.CommonFSUtils.getRootDir(CommonFSUtils.java:362)
        at org.apache.hadoop.hbase.util.CommonFSUtils.isValidWALRootDir(CommonFSUtils.java:411)
        at org.apache.hadoop.hbase.util.CommonFSUtils.getWALRootDir(CommonFSUtils.java:387)
        at org.apache.hadoop.hbase.regionserver.HRegionServer.initializeFileSystem(HRegionServer.java:704)
        at org.apache.hadoop.hbase.regionserver.HRegionServer.<init>(HRegionServer.java:613)
        at org.apache.hadoop.hbase.master.HMaster.<init>(HMaster.java:489)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
        at org.apache.hadoop.hbase.master.HMaster.constructMaster(HMaster.java:3093)
        ... 5 more
Caused by: java.lang.ClassNotFoundException: org.apache.htrace.SamplerBuilder
        at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        ... 25 more

看上去时找不到htrace的类定义，搜索hbase的lib目录，发现htrace位于：/bigdata/hbase/lib/client-facing-thirdparty
既然找不到，把它移到lib目录下试一试：

[root@cos76c:0 /bigdata/hbase/lib/client-facing-thirdparty]# mv htrace-core-3.1.0-incubating.jar ..
[root@cos76c:0 /bigdata/hbase/lib/client-facing-thirdparty]# start-hbase.sh
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/bigdata/hadoop-3.1.2/share/hadoop/common/lib/slf4j-log4j12-1.7.25.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/bigdata/hbase-2.1.3/lib/client-facing-thirdparty/slf4j-log4j12-1.7.25.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
running master, logging to /bigdata/hbase/logs/hbase-root-master-cos76c.out
node04: running regionserver, logging to /bigdata/hbase/bin/../logs/hbase-root-regionserver-cos76f.out
node03: running regionserver, logging to /bigdata/hbase/bin/../logs/hbase-root-regionserver-cos76e.out
node02: running master, logging to /bigdata/hbase/bin/../logs/hbase-root-master-cos76d.out

这样就可以了，OMG，问题是另一个节点一样的配置，为啥就没有问题呢？暂记录于此。

Failed construction RegionServer

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