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response-future: release request ids after send failure - #872
dkropachev merged 2 commits into
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Pull request overview
This PR fixes a request/stream ID leak in ResponseFuture._query() when the send path fails after a request ID has already been allocated, ensuring the ID is reclaimed and the connection state is cleaned up. This aligns with issue #871 by making request-id cleanup explicit for the “allocated-but-not-successfully-sent” failure path and keeping it covered by a unit test.
Changes:
- Track
request_idin_query()and ensure it is released back toconnection.request_idson send/encode failures after allocation. - Remove any partially-registered request callback state (
connection._requests) associated with the failed send before returning the connection to the pool. - Add a unit test to assert request-id reclamation and request map cleanup when a send fails after registration.
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.
| File | Description |
|---|---|
cassandra/cluster.py |
Adds request-id aware cleanup on _query() exception paths to prevent stream/request ID leaks. |
tests/unit/test_response_future.py |
Adds regression coverage ensuring request IDs and _requests entries are cleaned up after post-allocation send failures. |
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📝 Walkthrough
Priority: ⬇️ Low Change: Bug fix · Severity of issue fixed: Low Merge Risk: 🔵 Low · up to This change releases request IDs and replaces connections after send failures. A narrow race between a request timeout and a failed send may still need confirmation that it is fixed, though the PR's own tests appear to address it. The remaining risk is small and bounded. Pre-merge checks |
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| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Docstring Coverage |  |
Docstring coverage is 6.90% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 29 functions across 5 files. | Write docstrings for the functions missing them to satisfy the coverage threshold. |
✅ Passed checks (4 passed)
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Check name Status Explanation Title check The title clearly identifies the primary change: releasing request IDs after send failure. Description check The description explains the cleanup behavior, rationale, test coverage, and linked issue. It does not reproduce the repository checklist or confirm each checklist item, but the core required informat… Linked Issues check Issue #871requires request-path cleanup after a send failure allocates a request ID.ResponseFuturenow removes request state, restores reusable IDs for pooled requests, and handles uncertain push …Out of Scope Changes check ConnectionSendError, connection replacement handling, pool updates, and their tests support safe stream-ID reuse after uncertain sends. No unrelated change is identified.
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Actionable comments posted: 1
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @cassandra/cluster.py:
- Around line 7473-7474: Update the send-failure cleanup near the request ID
registration in `_query()` to coordinate with `_on_timeout()` before returning
the connection. If the timeout has already claimed the ID by adding it to
`connection.orphaned_request_ids`, do not release it for reuse; otherwise
preserve the existing cleanup behavior.
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cassandra/cluster.pytests/unit/test_response_future.py
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Codecov Report❌ Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## master #872 +/- ##
==========================================
+ Coverage 86.41% 86.52% +0.11%
==========================================
Files 43 43
Lines 18075 18119 +44
Branches 2776 2786 +10
==========================================
+ Hits 15619 15677 +58
+ Misses 1836 1820 -16
- Partials 620 622 +2 ☔ View full report in Codecov by Harness. 🚀 New features to boost your workflow:
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Remove any callback left under the borrowed request ID before returning the connection to its pool. Cover busy connections, failed encoding, and timeout behavior when another request borrows the released ID. Refs: scylladb#871
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A failed push may leave request bytes queued for delivery. Retire that connection before its stream ID can be reused, including synchronous response waits. Replace it without treating a local queue failure as evidence that the host is down. Restore the prior connection and its owning pool together after a failed send. Keep the established defunct override API and let a later heartbeat failure report the host down. Cover query, control connection, heartbeat, and pool behavior. Fixes: scylladb#871
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Fixes #871. Reclaims the request id when the send path fails after registration, and keeps the cleanup covered by unit tests.
Decisions