The quite-possibly-nutty idea has occurred to me of auto-generating a VCL that maps each of about 18 million artifacts (incoming URLs) to 1,2,or3 of what are effectively 621 backend locations. (The mapping is essentially arbitrary.)

Essentially, it would be replacing a squid url_rewrite_program.

Am I likely to hit any hard VCL implementation limits (in depth-of-conditional-nesting, overall size, VCL compilation overhead, etc.) if my VCL is ~100-200MB in size?

Am I overlooking some other more simple way to have varnish consult an arbitrary mapping (something similar to a squid url_rewrite_program)?

Thanks for any warnings/ideas.

- Gordon




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