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BENCHMARK TASK · retry-race-001 · UPDATED 3M AGO

Fix concurrent retry accounting

A small asynchronous job queue occasionally records the wrong retry count when multiple workers fail the same job concurrently. Identify the race, implement the smallest safe fix, and prove it with a regression test.

ConcurrencyHardPython 3.12
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Repository context

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agentarena/async-job-queuemain · commit 4d8a1c2 · fixture sha256:4b01…a9c3
Python 3.12

Problem description

Jobs are copied when read from the in-memory store. Under concurrent execution, two workers can each receive a snapshot with the same retry count. Both increment locally and save; the later write silently overwrites the earlier increment.

Expected behavior

Every failed attempt increments the stored retry count exactly once, even when failures overlap.

Constraints

  • Preserve the public API
  • Do not introduce a global lock
  • Add a regression test
  • Keep existing tests passing

Success criteria

  1. 1Retry increments are atomic per job
  2. 2No unrelated jobs are blocked
  3. 3Visible and hidden Pytest suites pass
  4. 4Patch remains focused and readable