环境：Cloudera
flume:1.9
自已打好jar包放入flume lib文件夹下；
如：flume-1.0.0/plugins.d/
flume-1.0.0/plugins.d/custom-MysqlSink/
flume-1.0.0/plugins.d/custom-MysqlSink/lib/mysql-sink.jar
flume-1.0.0/plugins.d/custom-MysqlSink/libext/mysql-connector-java-6.0.5.jar
启动后遇报错，信息如下：
Hbase2Sink
Could not instantiate event serializer.
java.lang.ClassNotFoundException: com.zhonghuan.eventhbase.Hbase2EventSerializer_eleT
at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:355)
at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:264)
at org.apache.flume.sink.hbase2.Hbase2Sink.configure(Hbase2Sink.java:247)
at org.apache.flume.conf.Configurables.configure(Configurables.java:41)
at org.apache.flume.node.AbstractConfigurationProvider.loadSinks(AbstractConfigurationProvider.java:453)
at org.apache.flume.node.AbstractConfigurationProvider.getConfiguration(AbstractConfigurationProvider.java:106)
at
找不到类，此时可以关注下jar包的权限问题，有可能flume或Cloudera 环境无法读取jar包导致的。
解决：修改jar包权限。例：chmod 777 mysql-connector-java-6.0.5.jar 即可解决。
附一个hbase序列化链接自定义hbase序列化
