Overview
In a big data storage scenario, HBase table data such as order data or monitoring data grows over time. As your business develops, such data can be of a large volume and rarely used. Companies may want to use cost-effective storage to store this type of data to reduce costs.
HBase separates cold data from hot data and stores them on different media. Cold data is stored in OBS and hot data is stored in HDFS, reducing storage costs.
This function is supported only by MRS 3.3.0 or later.
Principles
HBase supports separate cold and hot storage of data in the same table. After a user configures the time boundary between hot and cold data, HBase determines whether data is hot or cold based on the timestamp (ms) and the time boundary configured by the user. New data is stored in the hot storage and is gradually moved to the cold storage over time. You can change the time boundary for separating cold and hot data as you need. Data can be moved from the cold storage to the hot storage or vice versa.
Precautions
- IOPS of data reading in OBS decreases. As a result, OBS is suitable for infrequent queries only.
- It is not a good choice to use OBS for a large number of concurrent read requests. Otherwise, exceptions may occur.
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