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What is the difference between a federation and high availability?

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What is the difference between a federation and high availability?

HDFS Federation

HDFS High Availability

There is no limitation to the number of NameNodes and the NameNodes are not related to each other

All the NameNodes share a pool of metadata in which each NameNode will have its dedicated pool

Provides fault tolerance, i.e., if one NameNode goes down, it will not affect the data of the other NameNode

There are two NameNodes that are related to each other. Both active and standby NameNodes work all the time

One at a time, active NameNodes will be up and running, while standby NameNodes will be idle and updating its metadata once in a while

It requires two separate machines. First, the active NameNode will be configured, while the secondary NameNode will be configured on the other system

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