zipkin

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Published: Feb 16, 2021 License: MIT Imports: 17 Imported by: 0

README

Zipkin Input Plugin

This plugin implements the Zipkin http server to gather trace and timing data needed to troubleshoot latency problems in microservice architectures.

Please Note: This plugin is experimental; Its data schema may be subject to change based on its main usage cases and the evolution of the OpenTracing standard.

Configuration:

[[inputs.zipkin]]
    path = "/api/v1/spans" # URL path for span data
    port = 9411 # Port on which Telegraf listens

The plugin accepts spans in JSON or thrift if the Content-Type is application/json or application/x-thrift, respectively. If Content-Type is not set, then the plugin assumes it is JSON format.

Tracing:

This plugin uses Annotations tags and fields to track data from spans

  • TRACE: is a set of spans that share a single root span. Traces are built by collecting all Spans that share a traceId.

  • SPAN: is a set of Annotations and BinaryAnnotations that correspond to a particular RPC.

  • Annotations: for each annotation & binary annotation of a span a metric is output. Records an occurrence in time at the beginning and end of a request.

    Annotations may have the following values:

    • CS (client start): beginning of span, request is made.
    • SR (server receive): server receives request and will start processing it network latency & clock jitters differ it from cs
    • SS (server send): server is done processing and sends request back to client amount of time it took to process request will differ it from sr
    • CR (client receive): end of span, client receives response from server RPC is considered complete with this annotation
Tags
  • "id": The 64 bit ID of the span.
  • "parent_id": An ID associated with a particular child span. If there is no child span, the parent ID is set to ID.
  • "trace_id": The 64 or 128-bit ID of a particular trace. Every span in a trace shares this ID. Concatenation of high and low and converted to hexadecimal.
  • "name": Defines a span
Annotations have these additional tags:
  • "service_name": Defines a service
  • "annotation": The value of an annotation
  • "endpoint_host": Listening port concat with IPV4, if port is not present it will not be concatenated
Binary Annotations have these additional tag:
  • "service_name": Defines a service
  • "annotation": The value of an annotation
  • "endpoint_host": Listening port concat with IPV4, if port is not present it will not be concatenated
  • "annotation_key": label describing the annotation
Fields:
  • "duration_ns": The time in nanoseconds between the end and beginning of a span.
Sample Queries:

Get All Span Names for Service my_web_server

SHOW TAG VALUES FROM "zipkin" with key="name" WHERE "service_name" = 'my_web_server'
  • Description: returns a list containing the names of the spans which have annotations with the given service_name of my_web_server.

Get All Service Names

SHOW TAG VALUES FROM "zipkin" WITH KEY = "service_name"
  • Description: returns a list of all distinct endpoint service names.

Find spans with longest duration

SELECT max("duration_ns") FROM "zipkin" WHERE "service_name" = 'my_service' AND "name" = 'my_span_name' AND time > now() - 20m GROUP BY "trace_id",time(30s) LIMIT 5
  • Description: In the last 20 minutes find the top 5 longest span durations for service my_server and span name my_span_name

This test will create high cardinality data so we recommend using the tsi influxDB engine.

How To Set Up InfluxDB For Work With Zipkin
Steps
  1. Update InfluxDB to >= 1.3, in order to use the new tsi engine.

  2. Generate a config file with the following command:

influxd config > /path/for/config/file
  1. Add the following to your config file, under the [data] tab:
[data]
  index-version = "tsi1"
  1. Start influxd with your new config file:
influxd -config=/path/to/your/config/file
  1. Update your retention policy:
ALTER RETENTION POLICY "autogen" ON "telegraf" DURATION 1d SHARD DURATION 30m
Example Input Trace:
Trace Example from Zipkin model
{
  "traceId": "bd7a977555f6b982",
  "name": "query",
  "id": "be2d01e33cc78d97",
  "parentId": "ebf33e1a81dc6f71",
  "timestamp": 1458702548786000,
  "duration": 13000,
  "annotations": [
    {
      "endpoint": {
        "serviceName": "zipkin-query",
        "ipv4": "192.168.1.2",
        "port": 9411
      },
      "timestamp": 1458702548786000,
      "value": "cs"
    },
    {
      "endpoint": {
        "serviceName": "zipkin-query",
        "ipv4": "192.168.1.2",
        "port": 9411
      },
      "timestamp": 1458702548799000,
      "value": "cr"
    }
  ],
  "binaryAnnotations": [
    {
      "key": "jdbc.query",
      "value": "select distinct `zipkin_spans`.`trace_id` from `zipkin_spans` join `zipkin_annotations` on (`zipkin_spans`.`trace_id` = `zipkin_annotations`.`trace_id` and `zipkin_spans`.`id` = `zipkin_annotations`.`span_id`) where (`zipkin_annotations`.`endpoint_service_name` = ? and `zipkin_spans`.`start_ts` between ? and ?) order by `zipkin_spans`.`start_ts` desc limit ?",
      "endpoint": {
        "serviceName": "zipkin-query",
        "ipv4": "192.168.1.2",
        "port": 9411
      }
    },
    {
      "key": "sa",
      "value": true,
      "endpoint": {
        "serviceName": "spanstore-jdbc",
        "ipv4": "127.0.0.1",
        "port": 3306
      }
    }
  ]
}

Documentation

Index

Constants

View Source
const (
	// DefaultPort is the default port zipkin listens on, which zipkin implementations
	// expect.
	DefaultPort = 9411

	// DefaultRoute is the default route zipkin uses, and zipkin implementations
	// expect.
	DefaultRoute = "/api/v1/spans"

	// DefaultShutdownTimeout is the max amount of time telegraf will wait
	// for the plugin to shutdown
	DefaultShutdownTimeout = 5
)

Variables

View Source
var (
	// DefaultNetwork is the network to listen on; use only in tests.
	DefaultNetwork = "tcp"
)

Functions

func ContentDecoder

func ContentDecoder(r *http.Request) (codec.Decoder, error)

ContentDecoer returns a Decoder that is able to produce Traces from bytes. Failure should yield an HTTP 415 (`http.StatusUnsupportedMediaType`) If a Content-Type is not set, zipkin assumes application/json

Types

type Handler

type Handler interface {
	Register(router *mux.Router, recorder Recorder) error
}

Handler represents a type which can register itself with a router for http routing, and a Recorder for trace data collection.

type LineProtocolConverter

type LineProtocolConverter struct {
	// contains filtered or unexported fields
}

LineProtocolConverter implements the Recorder interface; it is a type meant to encapsulate the storage of zipkin tracing data in telegraf as line protocol.

func NewLineProtocolConverter

func NewLineProtocolConverter(acc telegraf.Accumulator) *LineProtocolConverter

NewLineProtocolConverter returns an instance of LineProtocolConverter that will add to the given telegraf.Accumulator

func (*LineProtocolConverter) Error

func (l *LineProtocolConverter) Error(err error)

func (*LineProtocolConverter) Record

func (l *LineProtocolConverter) Record(t trace.Trace) error

Record is LineProtocolConverter's implementation of the Record method of the Recorder interface; it takes a trace as input, and adds it to an internal telegraf.Accumulator.

type Recorder

type Recorder interface {
	Record(trace.Trace) error
	Error(error)
}

Recorder represents a type which can record zipkin trace data as well as any accompanying errors, and process that data.

type SpanHandler

type SpanHandler struct {
	Path string
	// contains filtered or unexported fields
}

SpanHandler is an implementation of a Handler which accepts zipkin thrift span data and sends it to the recorder

func NewSpanHandler

func NewSpanHandler(path string) *SpanHandler

NewSpanHandler returns a new server instance given path to handle

func (*SpanHandler) Register

func (s *SpanHandler) Register(router *mux.Router, recorder Recorder) error

Register implements the Service interface. Register accepts zipkin thrift data POSTed to the path of the mux router

func (*SpanHandler) Spans

func (s *SpanHandler) Spans(w http.ResponseWriter, r *http.Request)

Spans handles zipkin thrift spans

type Zipkin

type Zipkin struct {
	ServiceAddress string
	Port           int
	Path           string

	Log telegraf.Logger
	// contains filtered or unexported fields
}

Zipkin is a telegraf configuration structure for the zipkin input plugin, but it also contains fields for the management of a separate, concurrent zipkin http server

func (Zipkin) Description

func (z Zipkin) Description() string

Description is a necessary method implementation from telegraf.ServiceInput

func (*Zipkin) Gather

func (z *Zipkin) Gather(acc telegraf.Accumulator) error

Gather is empty for the zipkin plugin; all gathering is done through the separate goroutine launched in (*Zipkin).Start()

func (*Zipkin) Listen

func (z *Zipkin) Listen(ln net.Listener, acc telegraf.Accumulator)

Listen creates an http server on the zipkin instance it is called with, and serves http until it is stopped by Zipkin's (*Zipkin).Stop() method.

func (Zipkin) SampleConfig

func (z Zipkin) SampleConfig() string

SampleConfig is a necessary method implementation from telegraf.ServiceInput

func (*Zipkin) Start

func (z *Zipkin) Start(acc telegraf.Accumulator) error

Start launches a separate goroutine for collecting zipkin client http requests, passing in a telegraf.Accumulator such that data can be collected.

func (*Zipkin) Stop

func (z *Zipkin) Stop()

Stop shuts the internal http server down with via context.Context

Directories

Path Synopsis
cmd
thrift_serialize
A small cli utility meant to convert json to zipkin thrift binary format, and vice versa.
A small cli utility meant to convert json to zipkin thrift binary format, and vice versa.

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