Distributed database is created using a peer-to-peer architecture. Explain, possibly using diagrams or examples, the architectural techniques to address the following:

1. Data items need to be mapped to nodes and items can be located without a Master.

2. When the load on the database grows, new nodes may be added with limited impact. 

3. Each data write is replicated to n nodes. A node fails when the first copy of the write is being written to that node. However the system can handle such failures.