The data processed by MRS is from OBS or HDFS. OBS is an object-based storage service that provides secure, reliable, and cost-effective storage of huge amounts of data. MRS can directly process data in OBS. You can view, manage, and use data by using the OBS console or OBS client. In addition, you can use REST APIs independently or integrate APIs to service applications to manage and access data.
- Data stored in OBS: Data storage is decoupled from compute. The cluster storage cost is low, and storage capacity is not limited. Clusters can be deleted at any time. However, the computing performance depends on the OBS access performance and is lower than that of HDFS. OBS is recommended for applications that do not demand a lot of computation.
- Data stored in HDFS: Data storage is not decoupled from compute. The cluster storage cost is high, and storage capacity is limited. The computing performance is high. You must export data before you delete clusters. HDFS is recommended for computing-intensive scenarios.