Question

我正在使用MongoDB hadoop连接器在hadoop中使用hive表来查询mongoDB。

我能够执行

select * from mongoDBTestHiveTable;

但是当我尝试执行以下查询时

select id from mongoDBTestHiveTable;

它抛出异常。

hive lib文件夹中存在以下类。

异常堆栈跟踪：

    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。

Answer 1

您还需要在所有工作人员的MR1 / MR2类路径中添加mongo-hadoop- *以及mongo驱动程序罐

MongoDB hadoop连接器无法在mongo hive表上查询

1 个答案: