Nice to see you on this forum. I am watching this space for quite sometime and I believe this book of yours will be one of the best sellers in the Hadoop space.
I have a questions for you,
Does your book covers various means of connection from various NoSQL DBs like MongoDB, Cassandra etc to Hadoop and is there any apache projects in the pipeline to address the emergent DB technologies like NewSQL like
VoltDB, Spanner etc?.
The book currently covers integration with both HBase and relational databases in chapter 2. With regards to other NoSQL systems this is still an emerging topic, and chapter 2 will be updated over time as solutions start coming up.