bryancall opened a new pull request, #12782:
URL: https://github.com/apache/trafficserver/pull/12782
Add configuration option `proxy.config.http.cache.defer_write_on_miss` to
defer opening the cache for write until after response headers are received and
evaluated for cacheability.
## Performance Impact
When enabled, this optimization:
- Avoids unnecessary cache overhead for non-cacheable responses
- Can improve throughput ~21x for non-cacheable content (e.g.,
`Cache-Control: no-store` responses)
## Trade-offs
When enabled:
- May affect read-while-write functionality
- May reduce request coalescing for popular uncached URLs
- Recommended only for traffic patterns with mostly unique URLs or
predominantly non-cacheable content
## Configuration
```yaml
proxy:
config:
http:
cache:
defer_write_on_miss: 1 # 0=disabled, 1=enabled
```
## How it works
1. On cache miss, set `cache_open_write_deferred=true` instead of
immediately opening cache for write
2. Go to origin and fetch response headers
3. Check if response is cacheable:
- If not cacheable (no-store, etc.): skip cache write entirely
- If cacheable: open cache for write and proceed normally
**Note:** Default is currently enabled for CI testing. Will be changed to
disabled before merge.
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