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Overview

Last updated: 2022-06-09 10:17:24

    CTSDB 2.0 (still referred to as CTSDB) supports data write, query, and other operations over the HTTP protocol. Its HTTP APIs are RESTful, and the resource request method is to send standard HTTP requests to the corresponding URIs of resources. For example, GET is used to get resources, POST create (or update) resources, PUT update resources, and DELETE delete resources.

    You can perform almost all data operations through HTTP APIs. CTSDB ensures data security by providing VPC-based network isolation and access authentication with username and password. Data is exchanged through structures in JSON format. Each request will return a standard HTTP response status code and content. If an operation fails, you can get specific error information based on the response content.

    For more information on how to connect to instances through RESTful API, see Connecting to Instance.

    Naming conventions

    The names of metrics, tags, and fields in CTSDB should be concise and clear. For more information on tags and fields, see Request Content:

    • Naming conventions for metrics: A name can contain 1–200 lowercase letters, digits, underscores, hyphens, and dots but cannot start with a dot, underscore, or hyphen.
    • Naming conventions for tags and fields in metrics: A name can contain 1–255 letters, digits, underscores, hyphens, and dots but cannot start with a dot.

    System limits

    • Limits of tags and fields in metrics: The total number of fields in a metric cannot exceed 1,000.
    • Limits of write points during bulk writing to metric: We recommend you limit the number of records in each bulk request between 1,000 and 5,000 and the physical size between 1 and 15 MB.

    System default rules

    • Processing of new fields during data write

      : If there are undefined new fields when you write data to a metric, CTSDB will store the new fields as tags by default. You can also change this by modifying the default_type field in the options parameter of the metric. For more information on metric modification, see Updating Metric.

      • If a new field is an integer, CTSDB will store it in long type.
      • If a new field is a decimal number, CTSDB will store it in float type.
      • If a new field is a string, CTSDB will store it in string type subject to the value of max_string_length and discard the excessive part. max_string_length can be customized and is 256 characters by default. For more information on modification, see Updating Metric.
    • Processing of date and time: Date and time are stored in UTC format in CTSDB. Therefore, for data queries involving time range, specify the time zone with the time_zone parameter, which is in the format of ISO 8601 UTC offset (e.g., +01:00 or -08:00). The specific time zone needs to be determined according to the region where the instance resides. Generally, the time zone for the Chinese mainland is UTC+8. For more information, see Common Query Samples.

    Connecting to an instance

    CTSDB instances currently can be connected to only in VPCs. You can connect to an instance in the console or through RESTful APIs. In the latter case, you need to provide the root account password to ensure security.

    Below is a code sample for connecting to an instance and creating a metric through curl. Here, ${user:password} is the username and password of the instance, ${vip}:${vport} the IP and port, and ${metric_name} the name of the created metric.

    curl -u ${user:password} -H 'Content-Type:application/json' -X PUT ${vip}:${vport}/_metric/${metric_name} -d'
    { 
    "tags": {
        "region": "string",
        "set":  "long",
        "host": "string"
    },
    "time": {
         "name": "timestamp",
         "format": "epoch_second"
    },
    "fields": {
        "cpu_usage":  "float"
    },
    "options": {
        "expire_day": 7,
        "refresh_interval": "10s",
        "number_of_shards": 5,
        "number_of_replicas": 1,
        "rolling_period": 1
    }
    }'
    
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