computer-scienceangular-roadmapbackend-roadmapblockchain-roadmapdba-roadmapdeveloper-roadmapdevops-roadmapfrontend-roadmapgo-roadmaphactoberfestjava-roadmapjavascript-roadmapnodejs-roadmappython-roadmapqa-roadmapreact-roadmaproadmapstudy-planvue-roadmapweb3-roadmap
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
34 lines
1.6 KiB
34 lines
1.6 KiB
# Replication |
|
|
|
Replication is futher derived in two components: |
|
|
|
- Master-Slave Replication |
|
- Master-Master Replication |
|
|
|
## Master-Slave Replication |
|
|
|
The master serves reads and writes, replicating writes to one or more slaves, which serve only reads. Slaves can also replicate to additional slaves in a tree-like fashion. If the master goes offline, the system can continue to operate in read-only mode until a slave is promoted to a master or a new master is provisioned. |
|
|
|
## Disadvantages Master-Slave replication |
|
|
|
Following are the disadvantages: |
|
- Additional logic is needed to promote a slave to a master. |
|
|
|
## Master-Master Replication |
|
|
|
Both masters serve reads and writes and coordinate with each other on writes. If either master goes down, the system can continue to operate with both reads and writes. |
|
|
|
## Disadvantages of Master-Master replication |
|
|
|
Following are the disadvantages of master-master replication: |
|
|
|
- A load balancer or you'll need to make changes to your application logic to determine where to write. |
|
- Most master-master systems are either loosely consistent (violating ACID) or have increased write latency due to synchronization. |
|
- Conflict resolution comes more into play as more write nodes are added and as latency increases. |
|
- See Disadvantage(s): replication for points related to both master-slave and master-master. |
|
|
|
|
|
Visi the following links for more resources: |
|
|
|
- [Replication - Master-Slave](https://github.com/donnemartin/system-design-primer#master-slave-replication) |
|
- [Master- Master Replication](https://github.com/donnemartin/system-design-primer#master-master-replication) |