Question

Is it possible to update existing MongoDB collection with new data. I am using hadoop job to read write data to Mongo. Required scenario is :-
Say first collection in Mongo is

{ 
  "_id" : 1,
  "value" : "aaa"
  "value2" : null
}

after reading data from Mongo and processing data, MongoDB should contain

{ 
  "_id" : 1,
  "value" : "aaa"
  "value2" : "bbb"
}

If possible, please provide some dummy code.

Answer 1

I have done it by extending org.apache.hadoop.mapreduce.RecordWriter and overriding write method of this class.