Retry OneFS API calls on AEC_SERVICE_UNAVAILABLE (503) - #119
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Jul 20, 2026
The accesses_onefs decorator only retried on the exact
"Try your request again." message. When PAPI returns a 503
AEC_SERVICE_UNAVAILABLE ("The limit for simultaneous requests
has been reached."), the error was raised immediately, which
caused transient chai test fixture-setup failures during bursts
of concurrent PAPI requests.
This issue is specially evident after PAPI team introduced rate limits
to all the PAPI requests.
The fix treats AEC_SERVICE_UNAVAILABLE as a retriable condition, and
replaces the previous unbounded, fixed-2s retry loop with bounded
retries using exponential backoff and jitter.
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The accesses_onefs decorator only retried on the exact "Try your request again." message. When PAPI returns a 503 AEC_SERVICE_UNAVAILABLE ("The limit for simultaneous requests has been reached."), the error was raised immediately, which caused transient chai test fixture-setup failures during bursts of concurrent PAPI requests.
This issue is specially evident after PAPI team introduced rate limits to all the PAPI requests.
The fix treats AEC_SERVICE_UNAVAILABLE as a retriable condition, and replaces the previous unbounded, fixed-2s retry loop with bounded retries using exponential backoff and jitter.