Comments (3)
ipetkov
commented on June 12, 2024
2
Hi @TommyCpp thanks for the quick response!
It actually does, if you look at singal, it employes a zero side channel and block on it until it receives the response from worker tasks. But it's a noop on worker tasks as there is no buffer in SimpleSpanProcessor
Ah my mistake, I should have looked at the implementation more closely!
I think there is a scanrio that force flush will block the runtime but I haven't be able to reproduce it. So if you have an minimal exmaple could you share it?
Yes! I did manage to boil it down to a minimal reproduction below:
# Cargo.toml
[package]
name = "otel-bug"
version = "0.1.0"
edition = "2021"
[dependencies]
opentelemetry = { version = "0.21", default-features = false, features = ["trace"] }
opentelemetry_sdk = { version = "0.21", default-features = false, features = ["rt-tokio", "trace"] }
opentelemetry-otlp = { version = "0.14", default-features = false, features = ["grpc-tonic", "trace"] }
tracing-opentelemetry = "0.22"
tracing = "0.1"
tracing-subscriber = { version = "0.3", features = [ "env-filter" ] }
tokio = { version = "1", features = ["rt", "rt-multi-thread"] }// src/main.rs
use opentelemetry::KeyValue;
use opentelemetry_sdk::{
trace::{BatchConfig, RandomIdGenerator, Sampler},
Resource,
};
use std::time::Duration;
use tracing_subscriber::{layer::SubscriberExt, EnvFilter};
#[tokio::main]
async fn main() {
let tracer = opentelemetry_otlp::new_pipeline()
.tracing()
.with_exporter(opentelemetry_otlp::new_exporter().tonic())
.with_batch_config(
BatchConfig::default()
.with_max_concurrent_exports(4)
// shorten the delay between when spans are flushed, default is 5s,
.with_scheduled_delay(Duration::from_secs(2)),
)
.with_trace_config(
opentelemetry_sdk::trace::config()
.with_sampler(Sampler::AlwaysOn)
.with_id_generator(RandomIdGenerator::default())
.with_resource(Resource::new(vec![KeyValue::new(
"service.name",
"FooService",
)])),
)
.install_batch(opentelemetry_sdk::runtime::Tokio)
.unwrap();
let tracer_provider = tracer.provider().unwrap();
let _ = tracing::subscriber::set_global_default(
tracing_subscriber::registry()
.with(tracing_opentelemetry::layer().with_tracer(tracer))
.with(EnvFilter::new("debug")),
);
// NB: This spawn is load bearing
let _ = tokio::spawn(async move {
// Do some work
let _ = foo().await;
// Attempt to flush traces
println!("start trace_provider flush");
for r in tracer_provider.force_flush() {
if let Err(e) = r {
println!("unable to fully flush traces: {e}");
}
}
println!("finished trace_provider flush");
})
.await;
}
#[tracing::instrument(ret)]
async fn foo() -> usize {
let mut sum = 0;
for _ in 0..10 {
sum += bar().await
}
sum
}
#[tracing::instrument]
async fn bar() -> usize {
tokio::time::sleep(Duration::from_millis(100)).await;
42
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from opentelemetry-rust.
ipetkov
commented on June 12, 2024
I think one way to resolve the tension of issues with an async-sync-async sandwich, without forcing callers to use an async API, is to change the force_flush APIs to take a callback that resolves when the flush completes, while the actual force_sync call itself becomes non-blocking. This would allow callers to effectively await the flush's completion however they would like (e.g. write to a channel, hold an async lock, etc.)
This would also allow for more consistent behavior across Simple and Batch processors. For example, SimpleSpanProcessor::force_flush enqueues a flush but does not actually block until it's done:
opentelemetry-rust/opentelemetry-sdk/src/trace/span_processor.rs
Lines 173 to 177 in 073f7a6
But the BatchSpanProcessor does try to block until the flush completes which can result in unexpected surprises when switching the implementation
An alternative proposal would be to expose a force_flush_async equivalent which might be simpler to use at the expense of a larger API surface.
I'd be interested in working on implementing this if there is interest in pursuing either of these proposals!
from opentelemetry-rust.
TommyCpp
commented on June 12, 2024
Thanks for the detail report! I believe this is the same issue as #868.
I think there is a scanrio that force flush will block the runtime but I haven't be able to reproduce it. So if you have an minimal exmaple could you share it?
For example, SimpleSpanProcessor::force_flush enqueues a flush but does not actually block until it's done
It actually does, if you look at singal, it employes a zero side channel and block on it until it receives the response from worker tasks. But it's a noop on worker tasks as there is no buffer in SimpleSpanProcessor
from opentelemetry-rust.
Related Issues (20)
- [Bug]: counters are always reset HOT 1
- [Feature]: PartialEq support for AnyValue HOT 1
- [Feature]: Stress Test is not leveraging max threads HOT 1
- [Feature]: SimpleSpanProcessor to be consistent with SimpleLogRecordProcessor HOT 4
- Proposal: Naming for features HOT 1
- Should this repo maintain examples showing tracing-opentelemetry? HOT 3
- [Bug]: View validations to be moved elsewhere
- [Bug]: Aggregation issues when using Views to drop attributes
- Add tests for appender-log crate HOT 2
- [Bug]: TracerProvider::force_flush moved from API to SDK without any way to downcast GlobalTracerProvider HOT 9
- [Feature]: Port opentelemetry-http to hyper 1.x HOT 14
- [Bug]: Serious metric corruption HOT 1
- [Feature]: Support Metrics, BatchProcessor without async runtime
- [Bug]: `cargo test` compile errors due to log crate removals HOT 7
- [Feature]: Add predicate to MetricReader and MetricProducer
- [Feature]: opentelemetry-appender-tracing should use semantic conventions HOT 2
- [Feature]: Is there a way to remove useless metrics attributes? HOT 7
- [Bug]: Wrong StatusCode ordinal in stdout exporter
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