问题：

regionserver.HRegionServer: Failed construction RegionServer
java.lang.NoClassDefFoundError: org/apache/htrace/SamplerBuilder

 解决步骤：

        1.先查看hbase/lib目录下是否有htrace-core-3.1.0-incubating.jar,有的话删除重新添加

        2.从hbase/lib/client-facing-thirdparty中复制htrace-core-3.1.0-incubating.jar到hbase/lib下

        3.重启成功。

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