Database Reference
In-Depth Information
Explaining the migration process
In this scenario, we have a replica set with one
primary
, one
secondary
, and one
ar-
biter
node. The following diagram shows the replica set and its members:
Then, we will add a new node to the existing replica set and remove the current
primary
node.
In this part, a new
secondary
node synchronizes its
oplog
with the
primary
node in
a background process. After completing synchronization, you can safely remove the
primary
node and wait for the replica set to choose the new
primary
node. This is the
election phase.
The following diagram shows the election procedure:
