Extract data from MongoDB with Sqoop to write on HDFS??

I am concerning about extracting data from MongoDB where my application transact most of the data from MongoDB. I ...

Default Namenode port of HDFS is 50070.But I have come across at some places 8020 or 9000?

When I setup the hadoop cluster, I read the namenode runs on 50070 and I set up accordingly and it's running fine. ...