NameNode as a single point of failure

[Dmitry Salychev]

Hello, HDFS Developers.

I know that NN is a single point of failure of an entire HDFS cluster. 
If it fails, the cluster will be unavailable no matter how many DN 
there. I know that there is an initiative 
<http://www.wandisco.com/system/files/documentation/Meetup-ConsensusReplication.pdf> 
which introduces ConsensusNode (as I can see it looks like distributed 
NN) and related issues (HDFS-6469 
<https://issues.apache.org/jira/browse/HDFS-6469>, HADOOP-10641 
<https://issues.apache.org/jira/browse/HADOOP-10641> and HDFS-7007 
<https://issues.apache.org/jira/browse/HDFS-7007>). So, I'd like to ask.

Has this NN-SPOF problem been solved? If it hasn't, can you show me an 
entry point where I can help to solve it?

Thanks for your time.