Rollup And Pre-Aggregates
Rollup And Pre-Aggregates
While TSDB is designed to store original, full resolution data as long as there is space, queries for wide time ranges or over many tag combinations can be quite painful. Such queries can take a long time to complete or, in the worst case, kill TSDs with out-of-memory exceptions. As of OpenTSDB 2.4, a set of new APIs allow for storing and querying lower resolution data to answer such queries much quicker. This page will give you an overview of what rollups and pre-aggregates are, how they work in TSDB and how best to use them. Look in the API's section for specific implementation details.
Note
OpenTSDB does not itself calculate and store rollup or pre-aggregated data. There are multiple ways to compute the results but they all have benefits and drawbacks depending on the scale and accuracy requirements. See the 登录查看完整内容
