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RATIS-2398. Add opentelemetry-javaagent to ratis-examples and assembly#1428

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RATIS-2398. Add opentelemetry-javaagent to ratis-examples and assembly#1428
taklwu wants to merge 2 commits intoapache:masterfrom
taklwu:RATIS-2398

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@taklwu taklwu commented Apr 15, 2026

also fixed a bug that client need to issue the parent span in the client request

What changes were proposed in this pull request?

  • make an example of how to use tracing in ratis-examples
  • make sure the script could be automatically running and span shows in the logs and Jaegar UI
  • fix the parent span issued from the client.

What is the link to the Apache JIRA

RATIS-2389

How was this patch tested?

manual tests for running the https://github.com/apache/ratis/tree/master/ratis-examples locally, tested with below

  1. logger mode that emits span in logs
# on the server 
[otel.javaagent 2026-04-15 15:40:24:419 -0700] [pool-3-thread-1] INFO io.opentelemetry.exporter.logging.LoggingSpanExporter - 'raft.server.submitClientRequestAsync' : 2a9bfd5258de404d4c8dcd291408538f 98677058d4b31a8e SERVER [tracer: org.apache.ratis:3.3.0-SNAPSHOT] AttributesMap{data={thread.id=69, thread.name=n0-client-thread1, raft.member.id=n0@group-6F7570313233, raft.call.id=51198, raft.client.id=client-5813AB26C91D}, capacity=128, totalAddedValues=5}
[otel.javaagent 2026-04-15 15:40:24:419 -0700] [pool-3-thread-2] INFO io.opentelemetry.exporter.logging.LoggingSpanExporter - 'raft.server.submitClientRequestAsync' : f56c5fe25544695b023cfcdcd4f32447 57fd34b224ee3d6a SERVER [tracer: org.apache.ratis:3.3.0-SNAPSHOT] AttributesMap{data={thread.id=69, thread.name=n0-client-thread1, raft.member.id=n0@group-6F7570313233, raft.call.id=51196, raft.client.id=client-5813AB26C91D}, capacity=128, totalAddedValues=5}

# from the client 
[otel.javaagent 2026-04-15 15:40:24:420 -0700] [grpc-default-executor-7] INFO io.opentelemetry.exporter.logging.LoggingSpanExporter - 'Async::send' : 3326eebb2357274628d3dea57e586435 2715719eb0c38ec3 CLIENT [tracer: org.apache.ratis:3.3.0-SNAPSHOT] AttributesMap{data={thread.id=37, raft.peer.id=LEADER, thread.name=pool-1-thread-20, raft.operation.type=RW, raft.operation.name=Async::send}, capacity=128, totalAddedValues=5}
  1. export traces to the third party otlp e.g. Jaegar
Screenshot 2026-04-15 at 3 39 32 PM

taklwu added 2 commits April 15, 2026 15:41
@taklwu
RATIS-2398. Add opentelemetry-javaagent to ratis-examples and assembly
39d98d2 
also fixed a bug that client need to issue the parent span in the client request
@taklwu
update README.md
8914833
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