OpenTSDB-Querying or Reading Data
Querying or Reading Data
OpenTSDB offers a number of means to extract data such as CLI tools, an HTTP API and as a GnuPlot graph. Querying with OpenTSDB's tag based system can be a bit tricky so read through this document and checkout the following pages for deeper information. Example queries on this page follow the HTTP API format.
- Dates and Times
- Understanding Metrics and Time Series
- Aggregators
- Query Examples
OpenTSDB提供很多方法抽取数据，例如CLI tools，HTTPAPI，Gnuplot图。
基于系统查询OpenTSDB的tag是件困难的事情。通过阅读下面的文档获取更多信息。
Query Components
OpenTSDB's query language is fairly simple but flexible. Each query has the following components:
OpenTSDB的查询语言是比较简单，灵活的。每个查询包括如下部分：
| Parameter | Date Type | Required | Description | Example |
|---|---|---|---|---|
| Start Time | String or Integer | Yes | Starting time for the query. This may be an absolute or relative time. See Dates and Times for details 相对值和值都支持 | 24h-ago |
| End Time | String or Integer | No | An end time for the query. If the end time is not supplied, the current time on the TSD will be used. See Dates and Times for details. 可以不提供，默认是当前时间 | 1h-ago |
| Metric | String | Yes | The full name of a metric in the system. Must be the complete name. Case sensitive metric的名字，大小写敏感 | sys.cpu.user |
| Aggregation Function | String | Yes | A mathematical function to use in combining multiple time series 整合多个时间序列的数学函数 | sum |
| Tags | String | No | An optional set of tags for filtering or grouping 基于tags进行过滤 | host=*,dc=lax |
| Downsampler | String | No | An optional interval and function to reduce the number of data points returned 减少返回数据点 | 1h-avg |
| Rate | String | No | An optional flag to calculate the rate of change for the result 计算结果变化的比率 | rate |
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