错误现象：
1. 今早在EMR3.2的生产新集群上执行导出操作，hbase org.apache.hadoop.hbase.mapreduce.Export safeclound.tb_ammeter /backup/tb_ammeter 1 1531843200000 1532016000000
2. 错误表现：
执行job任务一直卡住半天没动静，查看日志显示如下错误：
2018-07-19 17:07:26,113 INFO [main] mapreduce.Job: Task Id : attempt_1529895044112_7775_m_000002_1, Status : FAILEDError: java.io.IOException: Cannot create a record reader because of a previous error. Please look at the previous logs lines from the task's full log for more details. at org.apache.hadoop.hbase.mapreduce.TableInputFormatBase.createRecordReader(TableInputFormatBase.java:174) at org.apache.hadoop.mapred.MapTask$NewTrackingRecordReader.(MapTask.java:515)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:758)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:341)
at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:164)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:422)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1727)
at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:158)
Caused by: java.lang.IllegalStateException: The input format instance has not been properly initialized. Ensure you call initializeTable either in your constructor or initialize method
at org.apache.hadoop.hbase.mapreduce.TableInputFormatBase.getTable(TableInputFormatBase.java:585)
at org.apache.hadoop.hbase.mapreduce.TableInputFormatBase.createRecordReader(TableInputFormatBase.java:169)
... 8 more
然后查看日志：
Caused by: java.lang.ClassNotFoundException: org.apache.hadoop.hbase.ipc.controller.ServerRpcControllerFactory
....
解决方法（经联系阿里工程师，提供以下方案）：
1. 创建客户端使用的hbase配置
> mkdir /tmp/hbase-client-conf
> cp /etc/ecm/hbase-conf/* /tmp/hbase-client-conf
> vim /tmp/hbase-client-conf/hbase-site.xml
删除phoenix相关的配置，保存：
hbase.rpc.controllerfactory.class
hbase.master.loadbalancer.class
hbase.region.server.rpc.scheduler.factory.class
hbase.coprocessor.master.classes
2. 执行命令时指定使用客户端配置
hbase --config /tmp/hbase-client-conf org.apache.hadoop.hbase.mapreduce.Export safeclound.tb_ammeter /backup/tb_ammeter 1 1531843200000 1532016000000