我使用MongoDB hadoop连接器在hadoop中使用hive表查询MongoDB。
我可以执行
select * from mongoDBTestHiveTable;
但是当我尝试执行以下查询
时select id from mongoDBTestHiveTable;
抛出以下异常。
hive lib文件夹中存在以下类
异常异常堆栈:
Diagnostic Messages for this Task:
Error: java.io.IOException: Cannot create an instance of InputSplit class = com.mongodb.hadoop.hive.input.HiveMongoInputFormat$MongoHiveInputSplit:Class com.mongodb.hadoop.hive.input.HiveMongoInputFormat$MongoHiveInputSplit not found
at org.apache.hadoop.hive.ql.io.HiveInputFormat$HiveInputSplit.readFields(HiveInputFormat.java:147)
at org.apache.hadoop.io.serializer.WritableSerialization$WritableDeserializer.deserialize(WritableSerialization.java:71)
at org.apache.hadoop.io.serializer.WritableSerialization$WritableDeserializer.deserialize(WritableSerialization.java:42)
at org.apache.hadoop.mapred.MapTask.getSplitDetails(MapTask.java:370)
at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:402)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:341)
at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:162)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1491)
at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:157)
Caused by: java.lang.ClassNotFoundException: Class com.mongodb.hadoop.hive.input.HiveMongoInputFormat$MongoHiveInputSplit not found
at org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:1626)
at org.apache.hadoop.hive.ql.io.HiveInputFormat$HiveInputSplit.readFields(HiveInputFormat.java:144)
... 10 more
Container killed by the ApplicationMaster.
请建议。
您还需要将mongo-hadoop-*以及mongo driver jar添加到所有worker的MR1/MR2类路径