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Jaeger

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is an open-source, end-to-end distributed tracing tool that originated from
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. It helps monitor and troubleshoot microservices-based applications.

Databend has the ability to export tracing data to Jaeger by integrating with the

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SDK. The following tutorial shows you how to deploy and use Jaeger to trace Databend.

Tutorial: Trace Databend with Jaeger​

Step 1. Deploy Jaeger​

This tutorial uses the All In One image to deploy Jaeger in Docker. If you already have a running Jaeger instance, you can skip this step.

docker run --rm -d --name jaeger \
  -e COLLECTOR_ZIPKIN_HOST_PORT=:9411 \
  -p 6831:6831/udp \
  -p 6832:6832/udp \
  -p 5778:5778 \
  -p 16686:16686 \
  -p 4317:4317 \
  -p 4318:4318 \
  -p 14250:14250 \
  -p 14268:14268 \
  -p 14269:14269 \
  -p 9411:9411 \
  jaegertracing/all-in-one:latest

Step 2. Set Environment Variables​

Set the following environment variables according to your actual tracing level requirements and Jaeger endpoint.

  • DATABEND_TRACING_CAPTURE_LOG_LEVEL: Sets the log level that will attach to spans.
  • DATABEND_OTEL_EXPORTER_OTLP_ENDPOINT: Sets the endpoint the OpenTelemetry Collector is listening on.
export DATABEND_TRACING_CAPTURE_LOG_LEVEL=DEBUG
export DATABEND_OTEL_EXPORTER_OTLP_ENDPOINT=http://127.0.0.1:4317

Step 3. Deploy Databend​

  1. Follow the

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    to deploy Databend.

  2. Run the following SQL statements:

CREATE TABLE t1(a INT);
INSERT INTO t1 VALUES(1);
INSERT INTO t1 SELECT * FROM t1;

Step 4. Check Tracing Information on Jaegar​

  1. Go to

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    and select the Search tab.

  2. Select a service in the Service drop-down list. For example, select the databend-query service.

  3. Click Find Traces to show the traces.