Hi, I am testing collapsed_forwarding plugin (https://docs.trafficserver.apache.org/en/latest/admin-guide/plugins/collapsed_forwarding.en.html?highlight=collapsed_forwarding) via ATS 6.2.x branch.
We observed an error "DNS error 2 for [testurl.com]" for cache-miss, when remap.config is configured with "collapsed_forwarding" to work alone as a remap plugin. We must modify TSRemapDoRemap() in the plugin to "return TSREMAP_NO_REMAP" to allow DNS lookup successful. It does not seem right for the plugin to do "return TSREMAP_NO_REMAP" when it did not. Can someone help me to understand how this plugin needs to be used? Or does it require the fix I mentioned above? Regards, Kishore == Sample remap.config entry and cach miss error when used "collapsed_forwarding" by itself == map http://testurl.com/ http://origin.com/ @plugin=collapsed_forwarding.so @pparam=--delay=10 @pparam=--retries=5 I observed that during cache-miss, DNS query happens on the 'from' url (hostname) in the remap and it gets failed. .... [Sep 9 19:39:16.355] Server {0x2b170ea6c940} DEBUG: (dns) send query (qtype=1) for testurl.com to fd 43 [Sep 9 19:39:16.355] Server {0x2b170ea6c940} DEBUG: (dns) sent qname = testurl.com, id = 9287, nameserver = 1 [Sep 9 19:39:16.355] Server {0x2b170ea6c940} DEBUG: (dns) sent_one: failover_number for resolve 1 is 1 [Sep 9 19:39:16.628] Server {0x2b170ea6c940} DEBUG: (dns) received packet size = 52 [Sep 9 19:39:16.628] Server {0x2b170ea6c940} DEBUG: (dns) round-robin: nameserver 1 DNS respons code = 0 [Sep 9 19:39:16.628] Server {0x2b170ea6c940} DEBUG: (dns) received rcode = 2 [Sep 9 19:39:16.628] Server {0x2b170ea6c940} DEBUG: (dns) DNS error 2 for [testurl.com] [Sep 9 19:39:16.628] Server {0x2b170ea6c940} DEBUG: (dns) doing retry for testurl.com I further looked in to the code and found that it is due to return code from the plugin is TSREMAP_DID_REMAP in TSRemapDoRemap(). It makes ATS not to perform remap.
