Message Queue for Apache Kafka supports two storage engines: cloud storage and local storage. This topic compares the two storage engines to help you select the appropriate one.
Cloud storage and local storage
|Item||Cloud storage||Local storage|
|Underlying algorithm||Alibaba Cloud disk algorithm||In-Sync Replicas (ISR) algorithm of native Apache Kafka|
|Requirements for instance versions||None||Message Queue for Apache Kafka instances of the Professional Edition with the open-source version 2.2.0|
|Replica mechanism||Three replicas in distributed mode
||Three replicas in distributed mode
If you need 900 GB storage capacity, you must purchase 2,700 GB storage capacity.
|Message type||Normal messages
A small number of messages become out of order during instance restart or downtime.
|Partitionally ordered message
When the cluster is down, a new leader is automatically selected from ISR.