Redis: BCAST Tracking Cost Fix
A single pull request targets broadcast-mode client tracking overhead. PR #15895 aims to make invalidation cost independent of prefix count, reducing wasted work on writes and in the event loop.
Duration: PT2M9S
Episode overview
This episode is a short developer briefing from Redis.
It explains recent repository work in plain language.
- Show: Redis
- Published: 2026-10-03T13:14:26Z
- Audio duration: PT2M9S
Transcript excerpt
This excerpt keeps the crawler page concise. Listen to the episode or use the RSS feed for the full update.
Hello, it's Saturday, October 3rd, 2026, and this is your Redis developer briefing.
Today's activity does not form a broader pattern. There is a single change, and it targets a clear scaling bottleneck in client-side caching.
The context is broadcast mode, where clients register key prefixes they want invalidation messages for. Once even one such client is active, Redis ran two scans over the entire prefix registry. One ran for every modified key, to queue matching keys for broadcast. The other ran on every event loop cycle, just before…
That design means cost grew with the number of prefixes, not with actual invalidation work. For deployments with many services registering distinct prefixes, or with fine-grained caching schemes, that is pure overhead on the write path and on the main loop — wasted processor time, higher tail latency, and less…
Pull request 15895, linked to issues 15256 and 8634, aims to make that cost independent of prefix count. The work centers on the prefix tracking structures and the broadcast logic itself. For developers, the takeaway is practical: you should be able to scale broadcast tracking to more prefixes without the same…
Also worth remembering: prefix…
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