将mongoDB的所有集合作为输入传递给mapreduce hadoop
我需要将MongoDB中数据库的所有集合作为输入传递给Hadoop MR作业。有一种方法允许多个输入:将mongoDB的所有集合作为输入传递给mapreduce hadoop,mongodb,hadoop,mapreduce,mongo-collection,Mongodb,Hadoop,Mapreduce,Mongo Collection,我需要将MongoDB中数据库的所有集合作为输入传递给Hadoop MR作业。有一种方法允许多个输入: MultiCollectionSplitBuilder mcsb = new MultiCollectionSplitBuilder(); mcsb.add(new MongoURI("mongodb://localhost:27017/mongo_hadoop.yield_historical.in"), (MongoURI)null, // authuri
MultiCollectionSplitBuilder mcsb = new MultiCollectionSplitBuilder();
mcsb.add(new MongoURI("mongodb://localhost:27017/mongo_hadoop.yield_historical.in"),
(MongoURI)null, // authuri
true, // notimeout
(DBObject)null, // fields
(DBObject)null, // sort
(DBObject)null, // query
false,
MultiMongoCollectionSplitter.class)
.add(new MongoURI("mongodb://localhost:27017/mongo_hadoop.yield_historical.in"),
(MongoURI)null, // authuri
true, // notimeout
(DBObject)null, // fields
(DBObject)null, // sort
new BasicDBObject("_id", new BasicDBObject("$gt", new Date(883440000000L))),
false, // range query
MultiMongoCollectionSplitter.class);
但我的数据库中有大约10个集合。上述方法仅允许2个集合参数。
我所需要做的就是用mapper Methods单独获取所有集合。我的减速机对他们来说都是一样的
感谢您的帮助 您可以继续添加到MultiCollectionSplitBuilder
MultiCollectionSplitBuilder mcsb = new MultiCollectionSplitBuilder();
mcsb
.add(new MongoURI("mongodb://localhost:27017/mongo_hadoop.yield_historical.in"),
(MongoURI) null, // authuri
true, // notimeout
(DBObject) null, // fields
(DBObject) null, // sort
(DBObject) null, // query
false,
MultiMongoCollectionSplitter.class
)
.add(new MongoURI("mongodb://localhost:27017/mongo_hadoop.yield_historical.in"),
(MongoURI) null, // authuri
true, // notimeout
(DBObject) null, // fields
(DBObject) null, // sort
new BasicDBObject("_id", new BasicDBObject("$gt", new Date(883440000000L))),
false, // range query
MultiMongoCollectionSplitter.class
)
.add(new MongoURI("mongodb://localhost:27017/mongo_hadoop.yield_historical.in"),
(MongoURI) null, // authuri
true, // notimeout
(DBObject) null, // fields
(DBObject) null, // sort
new BasicDBObject("_id", new BasicDBObject("$gt", new Date(883440000000L))),
false, // range query
MultiMongoCollectionSplitter.class
)
;
谢谢你,艾伦。但是我的程序无法使用此选项连接。仅当我使用MongoConfigUtil.setInputURI()只传递一个集合时,它才起作用