disthene-reader: cassandra backed metric storage reader

Motivation

This is a "dual" project to disthene. Though the data written by disthene can still be read and plotted by combination of cyanite & graphite-api, this schema introduces quite some overhead at least caused by serializing/deserializing to/from json. In cases when rendering a graph involves 10s of millions of data points this overhead is quite noticable. Besides that graphite-api as well as original graphite rendering could really be a bit faster. All in all, this project is about read and rendering performance exactly like disthene is about write performance.

What's in

The following APIs are supported:

• /paths API for backward compatibility with graphite-api and cyanite
• /metrics
• /render mostly as per Graphite specification version 0.10.0

The functions are mostly per Graphite specification version 0.10.0 with several exceptions below.

The following functions have a different implementation:

• stdev (see graphite-project/graphite-web#986)
• holtWintersForecast
• holtWintersConfidenceBands
• holtWintersConfidenceArea
• holtWintersAberration

The following functions are not implemented:

• smartSummarize
• fallbackSeries
• removeBetweenPercentile
• useSeriesAbove
• removeEmptySeries
• map
• mapSeries
• reduce
• reduceSeries
• identity
• cumulative
• consolidateBy
• changed
• substr
• time
• sin
• randomWalk
• timeFunction
• sinFunction
• randomWalkFunction
• events

Compiling

This is a standard Java Maven project.

mvn package

will most probably do the trick.

Running

There are a couple of things you will need in runtime, just the same set as for cyanite and/or disthene

• Cassandra
• Elasticsearch
• Graphite-web (probably a modified version like https://github.com/cybem/graphite-web-iow)
• graphite-cyanite

Configuration

There several configuration files involved

• /etc/disthene-reader/disthene-reader.yaml (location can be changed with -c command line option if needed)
• /etc/disthene-reader/disthene-reader-log4j.xml (location can be changed with -l command line option if needed)

Main configuration in disthene.yaml

reader:
# bind address and port
  bind: "0.0.0.0"
  port: 8080
# rollups - currently only "s" units supported  
  rollups:
    - 60s:5356800s
    - 900s:62208000s
store:
# C* contact points, port, keyspace and table
  cluster:
    - "cassandra-1"
    - "cassandra-2"
  port: 9042
  keyspace: 'metric'
  columnFamily: 'metric'
# maximum connections per host , timeouts in seconds, max requests per host - these are literally used in C* java driver settings
  maxConnections: 2048
  readTimeout: 10
  connectTimeout: 10
  maxRequests: 128
index:
# ES cluster name, contact points, native port, index name & type
  name: "disthene"
  cluster:
    - "es-1"
    - "es-2"
  port: 9300
  index: "disthene"
  type: "path"
# Maxim number paths allowed per one wildcard. This is just to prevent abuse
  maxPaths: 50000
stats:
# flush self metrics every 'interval' seconds
  interval: 60
# tenant to use for stats
  tenant: "graphite"
# (optional) hostname to use if not specified system's hostname will be used
  hostname: "disthene-reader"
# (optional) path prefix for stats metrics, default to ""
  pathPrefix: ""
# carbon server to send stats to
  carbonHost: "carbon.example.net"
# carbon port to send stats to
  carbonPort: 2003  

Logging configuration in disthene-reader-log4j.xml

Configuration is straight forward as per log4j

License

The MIT License (MIT)

Copyright (C) 2015 Andrei Ivanov

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.