perf: Async Redis Connection Handling to Prevent Main Thread Blocking#15303
perf: Async Redis Connection Handling to Prevent Main Thread Blocking#15303medhaRachel wants to merge 3 commits into
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Fix ID: 8e4966bb-bfcb-4088-8188-d51d27a721df Anomaly Type: latency_spike The original code performs synchronous redisConnect() calls on the main execution thread, which can cause significant latency spikes when network operations take longer than expected. The fix implements non-blocking connection handling using redisConnectNonBlock() and redisGetReply() with proper error handling to prevent the main thread from being blocked during network operations. Generated by OptimaCore AI Performance Intelligence
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Fix ID: 8e4966bb-bfcb-4088-8188-d51d27a721df Anomaly Type: latency_spike The original code performs synchronous redisConnect() calls on the main execution thread, which can cause significant latency spikes when network operations take longer than expected. The fix implements non-blocking connection handling using redisConnectNonBlock() and redisGetReply() with proper error handling to prevent the main thread from being blocked during network operations. Generated by OptimaCore AI Performance Intelligence
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Cursor Bugbot has reviewed your changes and found 1 potential issue.
Reviewed by Cursor Bugbot for commit 261f5d2. Configure here.
| FD_ZERO(&write_fds); | ||
| FD_SET(fd, &write_fds); | ||
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| if (select(fd + 1, NULL, &write_fds, NULL, &timeout) > 0 && FD_ISSET(fd, &write_fds)) { |
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Uses socket before connect errors
High Severity
After redisConnectNonBlock, the code only checks for a null context. Hiredis can return a non-null context with err set and fd still REDIS_INVALID_FD (e.g. DNS or early connect failure). The code then calls FD_SET and select on that fd, which is undefined behavior and can crash or mis-handle the failure.
Reviewed by Cursor Bugbot for commit 261f5d2. Configure here.
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Note
Low Risk
Isolated benchmark helper using standard non-blocking connect completion; no auth, persistence, or server core changes.
Overview
Adds
getRedisContextinredis-benchmark.cto obtain a hiredisredisContextwithout a fully blocking connect: it usesredisConnectNonBlock, then waits up to 1 second withselecton the socket’s write readiness, confirms success viagetsockopt(SO_ERROR), and **redisFree**s the context on timeout or connect failure.This matches the goal of avoiding indefinite blocking on connect while still returning a ready context (or
NULL) for benchmark use.Reviewed by Cursor Bugbot for commit 261f5d2. Bugbot is set up for automated code reviews on this repo. Configure here.