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Envoy Distributed Link Tracking

2022-07-22 12:25:00 【InfoQ】

although Istio It has been said that service governance and service observability have zero intrusion into business code , But to get a good quality call chain , The application still needs to cooperate to do something , For example, it needs to be in a similar HTTP The place of the head passes Span Information , Such Span Can be correctly linked into a trace. Therefore, the application must collect and transmit these trace Relevant head and pass it out . Let's say http As an example to briefly introduce .

Implementation level ,Envoy The initialization of the distributed tracking feature is done by MainImpl：：initializeTracers be responsible for , Here, first judge whether it is HTTP agreement , Then use the tracking plug-in name specified in the configuration file , Call the corresponding plug-in factory Of HTTP Tracer Create a function , complete HTTP Tracer The initialization .
One 、Metric Support
Metric Used to deal with Envoy The core index data of , Specific reasons stats Subsystem implementation ,Envoy stats Include 3 Class core statistics .
  • Counter（ Counter ）
The counter is used for cumulative statistics of monotonically increasing statistical items , For example, request total QPS.
  • Gauge
Gauge It is also a very common measurement , Used to record sample sequence . and Counter comparison ,Gauge Can increase and decrease , For example, the number of tasks in the queue to be processed 、 The number of idle connections in the connection pool ,Counter It will only increase but not decrease , There is a monotonic characteristic .
  • Histogram（ Histogram ）
Histogram It is used for statistical analysis of samples within a certain range , Finally, the statistical value corresponding to each quantile is generated . The quantile is Histogram A common concept in , such as 50 Quantizing takes time A And the average time spent B It's two different concepts .50 Quantile time refers to 50% Request on A Return within the time range ; Average processing time refers to the average processing time of all requests , In many scenarios, quantile statistics can better reflect the distribution characteristics of data than average statistics . For example, it takes time for request processing , adopt Histogram We can draw 50 Time consuming statistics of quantiles 、99 Time consuming statistics of quantiles, etc .
Two 、Log Support
Envoy Log Currently, only right HTTP The agreement has perfect support , Built in right HTTP Access log support .HTTP The access log feature is mainly filtered by logs 、 Log format and log output 3 Part of it is made up of .HTTP Log output , First, filter the matching logs through the corresponding log filtering module , Then format and standardize the log through the log format module , Finally, format the log according to the requirements of the log output module , Output to the corresponding position , It is convenient for subsequent log analysis and query .

HTTP Network protocol processing plug-in HttpConnectionManager be responsible for HTTP Protocol parsing and routing forwarding processing , Can parse HTTP A launch configuration , be used for HTTP Protocol handling . in the light of access_log characteristic , call access_log The factory method of , according to access_log To configure , Create the corresponding access_log example .

access_log The instance construction is specifically made by AccessLogFactory：：fromProto Be responsible for the completion of .fromProto You will first create the corresponding log filter according to the configuration , And then call factory.createAccessLogInstance Create the corresponding access_log example .
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