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From ezko <erez.ko...@harmonicinc.com>
Subject collapsed forwarding still leaking to origin
Date Thu, 18 Jun 2020 12:57:28 GMT
Hi,
we are evaluating ATS 8.0.7 as reverse proxy for caching linear video
(multiple instantaneous hits for the same content).
we enabled RWW and collapsed forwarding as described in the docs.
it works really well , but sometimes we see leaks to the origin. 
when leaking happens , we are seeing 303 with Cache Result Code =
ERR_CONNECT_FAIL

Our first priority is to protect the origin (because it fails when flooded).
when using RWW + ColFw , what is the recommended config to best protect the
origin ? 

BR,
Erez

Our config:
proxy.config.http.cache.open_write_fail_action 4
proxy.config.cache.enable_read_while_writer 1
proxy.config.http.redirection_enabled 1
proxy.config.http.number_of_redirections 10
proxy.config.http.redirect_use_orig_cache_key 1
proxy.config.http.background_fill_active_timeout 0
proxy.config.http.background_fill_completed_threshold 0
proxy.config.cache.max_doc_size 0
proxy.config.cache.read_while_writer.max_retries 10
proxy.config.cache.read_while_writer_retry.delay 50
proxy.config.http.cache.max_open_read_retries 5
proxy.config.http.cache.open_read_retry_time 10
proxy.config.http.wait_for_cache 1

and we also tried changing this one:
proxy.config.http.cache.max_open_write_retries 50

remap:
@plugin=collapsed_forwarding.so @pparam=--delay=40 @pparam=--retries=5



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