question Re: What is active and passive NameNode in Hadoop? in Support Questions

What is active and passive NameNode in Hadoop?

sumeet0_2_2_7 — Wed, 07 Feb 2018 20:05:09 GMT

What is the need of passive NameNode in Hadoop?

bandalora — Thu, 08 Feb 2018 02:36:13 GMT

bandalora — Thu, 08 Feb 2018 02:45:41 GMT

ArpitAgarwal — Thu, 08 Feb 2018 03:12:09 GMT

There is no such thing as a "passive" NameNode. Are you asking about the HA or non-HA configuration?

In an HA configuration, there is
1. Active NameNode that serves user requests.
2. Standby NameNode that generates periodic checkpoints. It can also take over the role of the Active if the previously active NameNode dies or becomes unresponsive.
In a non-HA configuration
1. Primary NameNode that serves user requests.
2. Secondary NameNode that generates periodic checkpoints. A secondary NameNode can never become the primary.

The terminology is unfortunately confusing.