Hadoop Info - Be Interview Ready - HA Cluster

1) Share your knowledge about HA cluster .

This features comes in 2.0 and above Apache Hadoop version .

Before that Namenode is the single point of failure means that if Namenode unavailable then whole cluster become unavailable.

To again it to work , manually we have to restart the Namenode services.

This High Availability architecture provides the solution to our problem that is allowing us to have two Namenodes.

1. Active Namenode 

2. Passive Namenode ( Also called as Standby Namenode)

So now your cluster is having two Namenodes . If one Namenode unavailable/down then you have other Namenode to take over the work and thus reduce the cluster down time.

This should be possible only when both Namenode shares the same metadata information. 

Next Hadoop Info share on 15/04/2017 . Be in touch . 

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