name node high availability on hadoop 1.x

[#1]

Hello Friends,

I have recently started working on hadoop and that too from 2.x onwards.

Also, I do understand the concept of High-Availability of NN in Hadoop 2.x .

But recently someone told me that even on Hadoop 1.x NN HA was possible, because Hadoop 1.x had ZK and QJN .

If so then why most of the articles on web always say NN was SPoF on Hadoop 1.x ?

Please do let me know the answer.

Thanking you

Santanu

[#2 · Accepted solution]

@Santanu Ghosh

The branch 1.x do not have namenode HA with QJN based. It is production ready and available only from hadoop-2.x.

You can refer HDFS-HA umbrella jira, HDFS-3278.

[#3]

Thanks a lot for your response and the clarification.