通过命令行 向 hbase 2.10. 协处理器 传参时， 发生了这样的报错，折腾了好几天，才解决掉。
ERROR org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost: Failed to load coprocessor com.ds.hbase.coprocessor.HbaseDataSyncJanusObserver
java.lang.LinkageError: loader constraint violation: loader (instance of org/apache/hadoop/hbase/util/CoprocessorClassLoader) previously initiated loading for a different type with name "org/apache/hadoop/conf/Configuration"
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:756)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:468)
at java.net.URLClassLoader.access$100(URLClassLoader.java:74)
at java.net.URLClassLoader$1.run(URLClassLoader.java:369)
at java.net.URLClassLoader$1.run(URLClassLoader.java:363)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:362)
at org.apache.hadoop.hbase.util.CoprocessorClassLoader.loadClass(CoprocessorClassLoader.java:317)
at org.apache.hadoop.hbase.util.CoprocessorClassLoader.loadClass(CoprocessorClassLoader.java:289)
at com.ds.hbase.coprocessor.HbaseDataSyncJanusObserver.start(HbaseDataSyncJanusObserver.java:52)
at org.apache.hadoop.hbase.coprocessor.BaseEnvironment.startup(BaseEnvironment.java:72)
at org.apache.hadoop.hbase.coprocessor.CoprocessorHost.checkAndLoadInstance(CoprocessorHost.java:263)
at org.apache.hadoop.hbase.coprocessor.CoprocessorHost.load(CoprocessorHost.java:226)
at org.apache.hadoop.hbase.coprocessor.CoprocessorHost.load(CoprocessorHost.java:185)
at org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost.loadTableCoprocessors(RegionCoprocessorHost.java:388)
at org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost.<init>(RegionCoprocessorHost.java:275)
at org.apache.hadoop.hbase.regionserver.HRegion.<init>(HRegion.java:827)
at org.apache.hadoop.hbase.regionserver.HRegion.<init>(HRegion.java:716)
at sun.reflect.GeneratedConstructorAccessor15.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at org.apache.hadoop.hbase.regionserver.HRegion.newHRegion(HRegion.java:7005)
at org.apache.hadoop.hbase.regionserver.HRegion.openHRegion(HRegion.java:7202)
at org.apache.hadoop.hbase.regionserver.HRegion.openHRegion(HRegion.java:7175)
at org.apache.hadoop.hbase.regionserver.HRegion.openHRegion(HRegion.java:7133)
at org.apache.hadoop.hbase.regionserver.HRegion.openHRegion(HRegion.java:7084)
at org.apache.hadoop.hbase.regionserver.handler.OpenRegionHandler.openRegion(OpenRegionHandler.java:283)
at org.apache.hadoop.hbase.regionserver.handler.OpenRegionHandler.process(OpenRegionHandler.java:108)
at org.apache.hadoop.hbase.executor.EventHandler.run(EventHandler.java:104)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
解决方法 ：在pom 中 为 hbase-server 的依赖，加上 <scope>provided</scope>， 使其 打包时，不被包含进去，就可以了。
<dependency>
<groupId>org.apache.hbase</groupId>
<artifactId>hbase-server</artifactId>
<version>${hbase.version}</version>
<scope>provided</scope>
</dependency>
具体原因，是Hbase 2.1.0 自定义的类加载器，加载类的顺序导致的，旧版本就没这个问题， jar包里不要留 hbase-server 的类，就可以了，因为主进程里已经有了，这样jar包 还能减小50M