[ https://issues.apache.org/jira/browse/TS-4888?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Phil Sorber updated TS-4888: ---------------------------- Fix Version/s: 6.2.1 > collapsed_forwarding plugin returns TSREMAP_DID_REMAP though it did not > perform remap > ------------------------------------------------------------------------------------- > > Key: TS-4888 > URL: https://issues.apache.org/jira/browse/TS-4888 > Project: Traffic Server > Issue Type: Bug > Components: Plugins > Affects Versions: 6.2.1, 7.1.0 > Reporter: Rajendra Kishore Bonumahanti > Assignee: Phil Sorber > Fix For: 6.2.1, 7.0.0 > > Time Spent: 2h 50m > Remaining Estimate: 0h > > Collapsed_forwarding plugin returns TSREMAP_DID_REMAP as a return value > though it did not perform any remap. This causes ATS not to perform remap and > makes the transaction failed due to DNS lookup error on "from url". > For more details.. > 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. -- This message was sent by Atlassian JIRA (v6.3.4#6332)