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can't find a master
com.mongodb.MongoException: can't find a master	at com.mongodb.DBTCPConnector.checkMaster(DBTCPConnector.java:437)	at com.mongodb.DBTCPConnector.call(DBTCPConnector.java:208)	at com.mongodb.DBApiLayer$MyCollection.__find(DBApiLayer.java:313)	at com.mongodb.DBApiLayer$MyCollection.__find(DBApiLayer.java:298)	at com.mongodb.DBCursor._check(DBCursor.java:369)	at com.mongodb.DBCursor._hasNext(DBCursor.java:492)	at com.mongodb.DBCursor.hasNext(DBCursor.java:517)	at test.real_mongo_0_1.real_mongo.tMongoDBInput_1Process(real_mongo.java:937)	at test.real_mongo_0_1.real_mongo.tMongoDBRow_1Process(real_mongo.java:540)	at test.real_mongo_0_1.real_mongo.tMongoDBConnection_1Process(real_mongo.java:410)	at test.real_mongo_0_1.real_mongo.runJobInTOS(real_mongo.java:1304)	at test.real_mongo_0_1.real_mongo.main(real_mongo.java:1163)