xai-org/x-algorithm · error · anyhow::Error
fetch failed after retries
Error message
{metric_label} fetch failed after retries: {e} What it means
This error is raised by strato_fetch in abuse-enforcement-service/service-lib/src/strato.rs after all retry attempts to fetch a Strato (configuration/feature) column have failed. The final underlying transport error e is wrapped with the metric label identifying which column was being fetched. Metrics are recorded with status 'error' before returning, so this failure is observable in the strato metrics.
Solutions
- Check the wrapped error {e} and strato metrics (label, status=error) to identify whether it's auth, timeout, or not-found
- Verify the Strato column path/namespace exists and the service has read permissions
- Inspect network/service-discovery connectivity to the Strato backend from the host
- If transient, increase retry count or backoff; if permanent (missing column), fix or remove the fetch
- Wrap callers with a fallback default so enforcement logic can proceed when the column is unavailable
Example fix
// before
let v = fetch_hpr_column(&client).await?;
// after
let v = match fetch_hpr_column(&client).await {
Ok(v) => v,
Err(e) => {
tracing::warn!("hpr column unavailable, using default: {e}");
default_hpr()
}
}; Defensive patterns
Strategy: fallback
Validate before calling
// Pre-check connectivity/health of the strato client before fetching
if !strato_client.is_healthy().await {
return Ok(default_value());
} Try / catch
// match on the error and degrade to a default rather than propagating
let v = match fetch_hpr_column(&client).await {
Ok(v) => v,
Err(e) if e.to_string().contains("fetch failed after retries") => {
tracing::warn!("strato unavailable, using default: {e}");
default_hpr()
}
Err(e) => return Err(e),
}; Prevention
- Monitor strato metrics (status=error rate) and alert before retries are exhausted
- Keep retry/backoff budgets sized for observed p99 latency of the strato backend
- Always define safe default values for enforcement-critical columns
When it happens
Trigger: Calling fetch_hpr_column or fetch_uas, which delegate to strato_fetch; the Strato RPC/get call returns errors on every retry attempt (network failure, missing column/namespace, permission denial, or deserialization/transport error), exhausting the retry budget.
Common situations: Strato service unreachable from the deployment (network policy, service discovery issues), the referenced column path being deleted or renamed, auth tokens missing/expired, or timeouts under heavy load causing every retry to fail.
Related errors
AI-assisted analysis of xai-org/x-algorithm@24c60942c5 (2026-08-28).
Data as JSON: /api/errors/c4162795728c0958.
Report an issue: GitHub.
Appendix: source
Thrown at abuse-enforcement-service/service-lib/src/strato.rs:52
let start = std::time::Instant::now();
let mut retries: u32 = 0;
let result = (|| async { strato.fetch(key.clone(), view.clone()).await })
.retry(strato_retry_strategy())
.notify(|err, dur| {
retries += 1;
warn!("{metric_label} fetch failed (retrying in {dur:?}): {err}");
})
.await;
match result {
Ok(resp) => {
let parsed: entities::StratoResponse<T> = serde_json::from_value(resp)
.map_err(|e| anyhow::anyhow!("{metric_label} parse error: {e}"))?;
record_strato_metrics(metric_label, "ok", start.elapsed(), retries);
Ok(parsed.v)
}
Err(e) => {
record_strato_metrics(metric_label, "error", start.elapsed(), retries);
Err(anyhow::anyhow!(
"{metric_label} fetch failed after retries: {e}"
))
}
}
}
#[tracing::instrument(skip_all, fields(is_allowlisted))]
pub async fn fetch_user_allowlist(
allowlist: Option<&ManhattanAllowlist>,
user_id: i64,
) -> AllowlistFacts {
let span = tracing::Span::current();
let Some(al) = allowlist else {
span.record("is_allowlisted", false);
return AllowlistFacts::default();
};
match al.get(user_id).await {
Some(record) => {View on GitHub (pinned to 24c60942c5)