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https://issues.apache.org/jira/browse/TS-598?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13009971#comment-13009971
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Leif Hedstrom commented on TS-598:
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Any chance Mohan can provide a fix for this?
> when using IP address in target OS map, the DNS lookup looks awful
> ------------------------------------------------------------------
>
> Key: TS-598
> URL: https://issues.apache.org/jira/browse/TS-598
> Project: Traffic Server
> Issue Type: Improvement
> Components: DNS, HTTP
> Affects Versions: 2.1.4
> Reporter: Zhao Yongming
> Fix For: 2.1.8
>
>
> the synthetic request make hostdb probes twice as it take 127.0.0.1 as
> hostname in the first probe:
> [Dec 19 00:42:24.656] Server {47412680705808} DEBUG: (hostdb) probe 127.0.0.1
> F9D5E018CA21DEE0 1 [ignore_timeout = 0]
> [Dec 19 00:42:24.656] Server {47412680705808} DEBUG: (hostdb) stale 728
> 1292689815 2097151, using it and refreshing it
> [Dec 19 00:42:24.656] Server {47412680705808} DEBUG: (hostdb) immediate
> answer for 127.0.0.1
> [Dec 19 00:42:24.656] Server {47412680705808} DEBUG: (hostdb) probe (null)
> AA30DE0F80A82135 1 [ignore_timeout = 0]
> [Dec 19 00:42:24.656] Server {47412680705808} DEBUG: (hostdb) immediate
> answer for <addr>
> [Dec 19 00:42:24.656] Server {47412680705808} DEBUG: (hostdb) hostname =
> localhost
> when using IP host as OS in remap, the dns lookup looks awful:
> [Dec 19 00:42:34.662] Server {47412681758480} DEBUG: (hostdb) probe 127.0.0.1
> F9D5E018CA21DEE0 1 [ignore_timeout = 0]
> [Dec 19 00:42:34.662] Server {47412681758480} DEBUG: (hostdb) immediate
> answer for 127.0.0.1
> [Dec 19 00:42:34.662] Server {47412681758480} DEBUG: (hostdb) probe (null)
> AA30DE0F80A82135 1 [ignore_timeout = 0]
> [Dec 19 00:42:34.662] Server {47412681758480} DEBUG: (hostdb) immediate
> answer for <addr>
> [Dec 19 00:42:34.662] Server {47412681758480} DEBUG: (hostdb) hostname =
> localhost
> [Dec 19 00:42:36.294] Server {47412671220544} DEBUG: (hostdb) probe
> 115.238.23.250 247FD52B368AF112 0 [ignore_timeout = 0]
> [Dec 19 00:42:36.294] Server {47412671220544} DEBUG: (hostdb) delaying force
> 0 answer for 115.238.23.250 [timeout 0]
> [Dec 19 00:42:36.310] Server {47412671220544} DEBUG: (hostdb) probe
> 115.238.23.250 247FD52B368AF112 0 [ignore_timeout = 0]
> [Dec 19 00:42:36.310] Server {47412671220544} DEBUG: (hostdb) DNS
> 115.238.23.250
> [Dec 19 00:42:36.310] Server {47412671220544} DEBUG: (hostdb_insert)
> inserting in bucket 620
> [Dec 19 00:42:36.310] Server {47412671220544} DEBUG: (hostdb) inserting for:
> 115.238.23.250: (md5: 247FD52B368AF112) now: 1292690555 timeout: 2097151 ttl:
> 2097151
> [Dec 19 00:42:36.310] Server {47412671220544} DEBUG: (hostdb) done
> 115.238.23.250 TTL 2097151
> [Dec 19 00:42:36.310] Server {47412671220544} DEBUG: (hostdb) probe (null)
> 3566BAF8CDEE083D 0 [ignore_timeout = 0]
> [Dec 19 00:42:36.310] Server {47412671220544} DEBUG: (hostdb) delaying force
> 0 answer for (null)
> [Dec 19 00:42:36.310] Server {47412671220544} DEBUG: (hostdb) probe
> 3566BAF8CDEE083D 0 [ignore_timeout = 0]
> [Dec 19 00:42:36.310] Server {47412671220544} DEBUG: (hostdb) DNS IP
> 115.238.23.250
> [Dec 19 00:42:36.310] Server {47412671220544} DEBUG: (dns) received query s��
> type = 12, timeout = 0
> [Dec 19 00:42:36.312] Server {47412671220544} DEBUG: (dns) enqueing query
> 250.23.238.115.in-addr.arpa
> [Dec 19 00:42:36.312] Server {47412671220544} DEBUG: (dns) adding first to
> collapsing queue
> [Dec 19 00:42:36.312] Server {47412671220544} DEBUG: (dns) send query for
> 250.23.238.115.in-addr.arpa to fd 33
> [Dec 19 00:42:36.312] Server {47412671220544} DEBUG: (dns) sent qname =
> 250.23.238.115.in-addr.arpa, id = 21309, nameserver = 0
> [Dec 19 00:42:36.312] Server {47412671220544} DEBUG: (dns) sent_one:
> failover_number for resolver 0 is 1
> [Dec 19 00:42:36.350] Server {47412671220544} DEBUG: (dns) received packet
> size = 103
> [Dec 19 00:42:36.350] Server {47412671220544} DEBUG: (dns) primary DNS
> response code = 3
> [Dec 19 00:42:36.350] Server {47412671220544} DEBUG: (dns) received rcode = 3
> [Dec 19 00:42:36.350] Server {47412671220544} DEBUG: (dns) DNS error 3 for
> [250.23.238.115.in-addr.arpa]
> [Dec 19 00:42:36.350] Server {47412671220544} DEBUG: (dns) domain extending
> 250.23.238.115.in-addr.arpa
> [Dec 19 00:42:36.350] Server {47412671220544} DEBUG: (dns) new name = .
> retries = 5
> [Dec 19 00:42:36.350] Server {47412671220544} DEBUG: (dns) send query for .
> to fd 33
> [Dec 19 00:42:36.350] Server {47412671220544} DEBUG: (dns) sent qname = ., id
> = 30807, nameserver = 0
> [Dec 19 00:42:36.350] Server {47412671220544} DEBUG: (dns) sent_one:
> failover_number for resolver 0 is 1
> [Dec 19 00:42:36.701] Server {47412671220544} DEBUG: (dns) received packet
> size = 92
> [Dec 19 00:42:36.701] Server {47412671220544} DEBUG: (dns) primary DNS
> response code = 0
> [Dec 19 00:42:36.701] Server {47412671220544} DEBUG: (dns) received rcode = 0
> [Dec 19 00:42:36.701] Server {47412671220544} DEBUG: (dns) DNS error 0 for [.]
> [Dec 19 00:42:36.701] Server {47412671220544} DEBUG: (dns) FAIL result for .
> = <not found> retry 0
> [Dec 19 00:42:36.701] Server {47412671220544} DEBUG: (dns) called back
> continuation for .
> [Dec 19 00:42:36.701] Server {47412671220544} DEBUG: (hostdb) probe
> 3566BAF8CDEE083D 0 [ignore_timeout = 1]
> [Dec 19 00:42:36.701] Server {47412671220544} DEBUG: (hostdb) failed for
> 115.238.23.250
> [Dec 19 00:42:36.701] Server {47412671220544} DEBUG: (hostdb_insert)
> inserting in bucket 2221
> [Dec 19 00:42:36.701] Server {47412671220544} DEBUG: (hostdb) inserting for:
> : (md5: 3566BAF8CDEE083D) now: 1292690555 timeout: 0 ttl: 0
> [Dec 19 00:42:36.759] Server {47412671220544} DEBUG: (hostdb) probe
> 115.238.23.250 247FD52B368AF112 1 [ignore_timeout = 0]
> [Dec 19 00:42:36.759] Server {47412671220544} DEBUG: (hostdb) immediate setby
> for 115.238.23.250
> [Dec 19 00:42:44.664] Server {47412679653136} DEBUG: (hostdb) probe 127.0.0.1
> F9D5E018CA21DEE0 1 [ignore_timeout = 0]
> [Dec 19 00:42:44.664] Server {47412679653136} DEBUG: (hostdb) immediate
> answer for 127.0.0.1
> [Dec 19 00:42:44.665] Server {47412679653136} DEBUG: (hostdb) probe (null)
> AA30DE0F80A82135 1 [ignore_timeout = 0]
> [Dec 19 00:42:44.665] Server {47412679653136} DEBUG: (hostdb) immediate
> answer for <addr>
> [Dec 19 00:42:44.665] Server {47412679653136} DEBUG: (hostdb) hostname =
> localhost
> we should fix it in http or hostdb
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