kai

KairosDB Erlang Client

⚠️ WIP. Do not use yet.

Roadmap / planned features:

1. Inserting metrics:

• pool of raw tcp clients (aka telnet API)
• schedules ELB-friendly "ping", prevents corporate firewalls from killing idle connections

2. Retreiving metrics and aggregations:

• REST API wrappers
• API for building metrics queries

3. pre-aggregation facility

4. benchmarks / load-testing tools

Detailed implementation status

• Configuration

  • Telnet port
  • Telnet host
  • Pool size
  • Ping interval
  • REST API port
  • REST API host

• Pool of telnet clients

  • Insert data points
  • Query version
  • Auto-reconnect
    • Proper back-off on connection errors (currently each connection is delayed to prevent reconnections at the same time)
  • ELB friendly keep-alive for erlang node-cassandra
  • ELB friendly keep-alive for kairos-cassandra

• REST API (adding data points is not planned, there is no good reason to do it within the scope of this client)

• • custom response wrappers
    • delete data points
    • delete metric
    • list metric names
    • list tag names
    • list tag values
    • query metrics
      • query builder api - stable (improvements pending)
      • validate input as much as possible
      • aggregates:
        • avg
        • sum
        • dev
        • div
        • histogram
        • least_squares
        • max
        • min
        • rate
      • tags support
      • group_by support
        • tags
        • time
        • value
      • exclude_tags
      • limit
      • order

• Pre-aggregation (TBD)

• Load-testing / spammers (TBD)

Credits

Authors

Adam Rutkowski hq@mtod.org

Łukasz Biedrycki lukasz.biedrycki@gmail.com

Special thanks

Thanks to Mahesh Paolini-Subramanya and Ubiquiti Networks for letting us making it an open source project.