spark shell 提交任务报错
Caused by: java.lang.NoSuchMethodError: org.apache.spark.network.util.AbstractFileRegion.transferred()J
at org.apache.spark.network.util.AbstractFileRegion.transfered(AbstractFileRegion.java:28)
at io.netty.channel.nio.AbstractNioByteChannel.doWrite(AbstractNioByteChannel.java:228)
at io.netty.channel.socket.nio.NioSocketChannel.doWrite(NioSocketChannel.java:282)
at io.netty.channel.AbstractChannel$AbstractUnsafe.flush0(AbstractChannel.java:879)
此类 AbstractFileRegion 在spark-network-common.xxx.jar中 classpath是有的，所以怀疑jar冲突
# 提交失败的classpath
[/data/xxx/dts-executor/executions/4998-0-1/resource
/data/xxx/dts-executor/plugins/sparkShell/conf
/data/xxx/dts-executor/plugins/sparkShell/di-dts-plugin-ic-1.0.0.jar
/usr/hdp/current/hadoop-client/*
/usr/hdp/current/hadoop-client/lib/*
/usr/hdp/current/hadoop-hdfs-client/*
/usr/hdp/current/hadoop-hdfs-client/lib/*
/usr/hdp/current/hadoop-mapreduce-client/*
/usr/hdp/current/hadoop-mapreduce-client/lib/*
/usr/hdp/current/hadoop-yarn-client/*
/usr/hdp/current/hadoop-yarn-client/lib/*
/usr/hdp/current/hive/lib/*
/usr/hdp/current/spark2-client/conf
/usr/hdp/current/spark2-client/jars/*]
# 提交成功的classpath
[/data/xxx/dts-executor/plugins/sparkShell/di-dts-plugin-ic-1.0.0.jar
/data/xxx/dts-executor/plugins/sparkShell/conf
/usr/hdp/current/spark2-client/jars/*
/usr/hdp/current/spark2-client/conf
/usr/hdp/current/hive/lib/*
/usr/hdp/current/hadoop-client/*
/usr/hdp/current/hadoop-client/lib/*
/usr/hdp/current/hadoop-mapreduce-client/*
/usr/hdp/current/hadoop-mapreduce-client/lib/*
/usr/hdp/current/hadoop-yarn-client/*
/usr/hdp/current/hadoop-yarn-client/lib/*
/usr/hdp/current/hadoop-hdfs-client/*
/usr/hdp/current/hadoop-hdfs-client/lib/*
/data/xxx/dts-executor/executions/5008-0-1/resource]
主要区别在于 /usr/hdp/current/spark2-client/jars/* 被提前了，后来发现是netty包冲突了
/usr/hdp/current/hadoop-client/*等下面有与 /usr/hdp/current/spark2-client/jars/* 以下两个包冲突
netty-3.9.9.Final.jar
netty-all-4.1.17.Final.jar
解决方案：
1.可以把spark相关classpath提到hadoop前，那么优先加载spark相关包(我们采用了这种)
2.如果不使用hadoop的netty相关的两个包，可以直接删除掉，那么就不存在冲突了
