尝试简单加载mongodb集合并将其转储到bash中，但我得到了这个呃。找不到任何解决方案。我的代码：
grunt> REGISTER /home/thomasjsk/me/mongo-java-driver-2.13.1.jar
grunt> REGISTER /home/thomasjsk/me/mongo-hadoop-r1.3.2/core/build/libs/mongo-hadoop-core-1.3.2.jar
grunt> REGISTER /home/thomasjsk/me/mongo-hadoop-r1.3.2/pig/build/libs/mongo-hadoop-pig-1.3.2.jar
grunt> raw = LOAD 'mongodb://localhost:27017/agile_data.email' using com.mongodb.hadoop.pig.MongoLoader();
2015-04-20 14:28:00,123 [main] INFO com.mongodb.hadoop.pig.MongoStorage - Initializing MongoLoader in dynamic schema mode.
2015-04-20 14:28:00,199 [main] INFO com.mongodb.hadoop.pig.MongoStorage - Initializing MongoLoader in dynamic schema mode.
grunt> dump raw
2015-04-20 14:28:07,510 [main] WARN org.apache.hadoop.util.NativeCodeLoader - Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
2015-04-20 14:28:07,543 [main] INFO com.mongodb.hadoop.pig.MongoStorage - Initializing MongoLoader in dynamic schema mode.
2015-04-20 14:28:07,578 [main] INFO org.apache.pig.tools.pigstats.ScriptState - Pig features used in the script: UNKNOWN
2015-04-20 14:28:07,650 [main] INFO org.apache.pig.newplan.logical.optimizer.LogicalPlanOptimizer - {RULES_ENABLED=[AddForEach, ColumnMapKeyPrune, GroupByConstParallelSetter, LimitOptimizer, LoadTypeCastInserter, MergeFilter, MergeForEach, PartitionFilterOptimizer, PushDownForEachFlatten, PushUpFilter, SplitFilter, StreamTypeCastInserter], RULES_DISABLED=[FilterLogicExpressionSimplifier]}
2015-04-20 14:28:07,903 [main] INFO com.mongodb.hadoop.pig.MongoStorage - Initializing MongoLoader in dynamic schema mode.
2015-04-20 14:28:07,906 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR 2998: Unhandled internal error. Found class org.apache.hadoop.mapreduce.JobContext, but interface was expected
我可以加载一个文件并正常转储它，这个只在我试图搞乱mongo的时候才会发生。
[Pig v0.13.0]