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The following commit(s) were added to refs/heads/master by this push:
     new c6fcfea717 Revert "Traffic Router DNS zone calculation optimizations 
(#7622)"
c6fcfea717 is described below

commit c6fcfea71760261de0aa7e6127697e8d0fce9fb0
Author: Zach Hoffman <[email protected]>
AuthorDate: Tue Jul 11 12:31:22 2023 -0600

    Revert "Traffic Router DNS zone calculation optimizations (#7622)"
    
    This reverts commit dcf6e316aa7d395c2ffabebe5e4c6d10bb7cf1a2.
---
 CHANGELOG.md                                       |  1 -
 .../traffic_router/core/config/ConfigHandler.java  | 12 +---
 .../traffic_router/core/dns/NameServer.java        |  8 ---
 .../traffic_router/core/edge/CacheRegister.java    | 13 ----
 .../core/edge/CacheRegisterTest.java               | 81 ----------------------
 5 files changed, 2 insertions(+), 113 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 740fc3b727..2365a34d47 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,7 +5,6 @@ The format is based on [Keep a 
Changelog](http://keepachangelog.com/en/1.0.0/).
 
 ## [unreleased]
 ### Added
-- [#7622](https://github.com/apache/trafficcontrol/pull/7622) *Traffic Router* 
Added further optimization to TR's algorithm of figuring out the zone for an 
incoming request.
 - [#7609](https://github.com/apache/trafficcontrol/pull/7609) *Traffic Portal* 
Added Scope Query Param to SSO login. 
 - [#7450](https://github.com/apache/trafficcontrol/pull/7450) *Traffic Ops* 
Removed hypnotoad section and added listen field to traffic_ops_golang section 
in order to simplify cdn config.
 - [#7290](https://github.com/apache/trafficcontrol/pull/7302) *Traffic 
Monitor* Update TM results with hostname from via header, syncronize health on 
caches with same service address
diff --git 
a/traffic_router/core/src/main/java/org/apache/traffic_control/traffic_router/core/config/ConfigHandler.java
 
b/traffic_router/core/src/main/java/org/apache/traffic_control/traffic_router/core/config/ConfigHandler.java
index 26a7c0e6ff..64cde8bfbd 100644
--- 
a/traffic_router/core/src/main/java/org/apache/traffic_control/traffic_router/core/config/ConfigHandler.java
+++ 
b/traffic_router/core/src/main/java/org/apache/traffic_control/traffic_router/core/config/ConfigHandler.java
@@ -102,16 +102,11 @@ public class ConfigHandler {
        private final AtomicBoolean cancelled = new AtomicBoolean(false);
        private final AtomicBoolean isProcessing = new AtomicBoolean(false);
 
-       private final Map<String, DeliveryService> fqdnToDeliveryService = new 
HashMap<>();
        private final static String NEUSTAR_POLLING_URL = "neustar.polling.url";
        private final static String NEUSTAR_POLLING_INTERVAL = 
"neustar.polling.interval";
 
        private final static String LOCALIZATION_METHODS = 
"localizationMethods";
 
-       public Map<String, DeliveryService> getFQDNToDeliveryServiceMap() {
-               return fqdnToDeliveryService;
-       }
-
        public String getConfigDir() {
                return configDir;
        }
@@ -187,7 +182,7 @@ public class ConfigHandler {
                                cacheRegister.setStats(stats);
                                parseTrafficOpsConfig(config, stats);
 
-                               final Map<String, DeliveryService> 
deliveryServiceMap = parseDeliveryServiceConfig(JsonUtils.getJsonNode(jo, 
deliveryServicesKey), cacheRegister);
+                               final Map<String, DeliveryService> 
deliveryServiceMap = parseDeliveryServiceConfig(JsonUtils.getJsonNode(jo, 
deliveryServicesKey));
 
                                parseCertificatesConfig(config);
                                
certificatesPublisher.setDeliveryServicesJson(deliveryServicesJson);
@@ -453,7 +448,7 @@ public class ConfigHandler {
                statTracker.initialize(statMap, cacheRegister);
        }
 
-       private Map<String, DeliveryService> parseDeliveryServiceConfig(final 
JsonNode allDeliveryServices, final CacheRegister cacheRegister) throws 
JsonUtilsException {
+       private Map<String, DeliveryService> parseDeliveryServiceConfig(final 
JsonNode allDeliveryServices) throws JsonUtilsException {
                final Map<String,DeliveryService> deliveryServiceMap = new 
HashMap<>();
 
                final Iterator<String> deliveryServiceIter = 
allDeliveryServices.fieldNames();
@@ -474,9 +469,6 @@ public class ConfigHandler {
 
                        deliveryService.setDns(isDns);
                        deliveryServiceMap.put(deliveryServiceId, 
deliveryService);
-                       
fqdnToDeliveryService.put(deliveryService.getRoutingName() + "." + 
deliveryService.getDomain(), deliveryService);
-                       fqdnToDeliveryService.put("_." + 
deliveryService.getDomain(), deliveryService);
-                       
cacheRegister.setFQDNToDeliveryServiceMap(fqdnToDeliveryService);
                }
 
                return deliveryServiceMap;
diff --git 
a/traffic_router/core/src/main/java/org/apache/traffic_control/traffic_router/core/dns/NameServer.java
 
b/traffic_router/core/src/main/java/org/apache/traffic_control/traffic_router/core/dns/NameServer.java
index 5e08488997..91c6fa5cf9 100644
--- 
a/traffic_router/core/src/main/java/org/apache/traffic_control/traffic_router/core/dns/NameServer.java
+++ 
b/traffic_router/core/src/main/java/org/apache/traffic_control/traffic_router/core/dns/NameServer.java
@@ -369,14 +369,6 @@ public class NameServer {
                        return;
                }
 
-               if (clientAddress != null && 
clientAddress.getHostName().equals("_")) {
-                       response.getHeader().setRcode(Rcode.NXDOMAIN);
-                       response.getHeader().setFlag(Flags.AA);
-                       addDenialOfExistence(qname, zone, response, flags);
-                       addSOA(zone, response, Section.AUTHORITY, flags);
-                       return;
-               }
-
                final SetResponse sr = zone.findRecords(qname, qtype);
 
                if (sr.isSuccessful()) {
diff --git 
a/traffic_router/core/src/main/java/org/apache/traffic_control/traffic_router/core/edge/CacheRegister.java
 
b/traffic_router/core/src/main/java/org/apache/traffic_control/traffic_router/core/edge/CacheRegister.java
index e173a798e2..e6de36b29d 100644
--- 
a/traffic_router/core/src/main/java/org/apache/traffic_control/traffic_router/core/edge/CacheRegister.java
+++ 
b/traffic_router/core/src/main/java/org/apache/traffic_control/traffic_router/core/edge/CacheRegister.java
@@ -32,7 +32,6 @@ public class CacheRegister {
        private Map<String,Cache> allCaches;
        private TreeSet<DeliveryServiceMatcher> deliveryServiceMatchers;
        private Map<String, DeliveryService> dsMap;
-       private Map<String, DeliveryService> fqdnToDeliveryServiceMap;
        private JsonNode config;
        private JsonNode stats;
        private int edgeTrafficRouterCount;
@@ -149,10 +148,6 @@ public class CacheRegister {
         * @return the DeliveryService that matches the request
         */
        public DeliveryService getDeliveryService(final Request request) {
-               final String requestName = request.getHostname();
-               if (getFQDNToDeliveryServiceMap() != null && 
getFQDNToDeliveryServiceMap().get(requestName) != null) {
-                       return getFQDNToDeliveryServiceMap().get(requestName);
-               }
                if (deliveryServiceMatchers == null) {
                        return null;
                }
@@ -184,14 +179,6 @@ public class CacheRegister {
                this.dsMap = dsMap;
        }
 
-       public Map<String, DeliveryService> getFQDNToDeliveryServiceMap() {
-               return fqdnToDeliveryServiceMap;
-       }
-
-       public void setFQDNToDeliveryServiceMap(final Map<String, 
DeliveryService> fqdnToDeliveryServiceMap) {
-               this.fqdnToDeliveryServiceMap = fqdnToDeliveryServiceMap;
-       }
-
        public JsonNode getTrafficRouters() {
                return trafficRouters;
        }
diff --git 
a/traffic_router/core/src/test/java/org/apache/traffic_control/traffic_router/core/edge/CacheRegisterTest.java
 
b/traffic_router/core/src/test/java/org/apache/traffic_control/traffic_router/core/edge/CacheRegisterTest.java
index 07f338e205..471167fcb6 100644
--- 
a/traffic_router/core/src/test/java/org/apache/traffic_control/traffic_router/core/edge/CacheRegisterTest.java
+++ 
b/traffic_router/core/src/test/java/org/apache/traffic_control/traffic_router/core/edge/CacheRegisterTest.java
@@ -15,23 +15,13 @@
 
 package org.apache.traffic_control.traffic_router.core.edge;
 
-import com.fasterxml.jackson.databind.node.ArrayNode;
-import com.fasterxml.jackson.databind.node.JsonNodeFactory;
-import com.fasterxml.jackson.databind.node.ObjectNode;
 import org.apache.traffic_control.traffic_router.core.ds.DeliveryService;
 import 
org.apache.traffic_control.traffic_router.core.ds.DeliveryServiceMatcher;
-import org.apache.traffic_control.traffic_router.core.request.DNSRequest;
 import org.apache.traffic_control.traffic_router.core.request.HTTPRequest;
 import org.apache.traffic_control.traffic_router.core.request.Request;
-import org.apache.traffic_control.traffic_router.core.util.JsonUtilsException;
 import org.junit.Before;
 import org.junit.Test;
-import org.xbill.DNS.Name;
-import org.xbill.DNS.TextParseException;
-import org.xbill.DNS.Type;
 
-import java.util.HashMap;
-import java.util.Map;
 import java.util.TreeSet;
 
 import static 
org.apache.traffic_control.traffic_router.core.ds.DeliveryServiceMatcher.Type.HOST;
@@ -100,75 +90,4 @@ public class CacheRegisterTest {
                httpRequest.setPath("foo/abcde/bar");
                assertThat(cacheRegister.getDeliveryService(httpRequest), 
nullValue());
        }
-
-       @Test
-       public void itReturnsDeliveryServiceFromFQDNMapForHTTPRequest() throws 
JsonUtilsException {
-               String requestName = "http://foo.service01.kabletown.com/";;
-               HTTPRequest httpRequest = new HTTPRequest();
-               httpRequest.setHostname("foo.service01.kabletown.com");
-               httpRequest.setRequestedUrl(requestName);
-               Map<String, DeliveryService> map = new HashMap<>();
-
-               ObjectNode node = JsonNodeFactory.instance.objectNode();
-               ArrayNode domainNode = node.putArray("domains");
-               domainNode.add("kabletown.com");
-               node.put("routingName","foo");
-               node.put("coverageZoneOnly", false);
-               DeliveryService ds = new DeliveryService("service01", node);
-
-               map.put("foo.service01.kabletown.com", ds);
-               map.put("_.service01.kabletown.com", ds);
-               cacheRegister.setFQDNToDeliveryServiceMap(map);
-
-               DeliveryService answer = 
cacheRegister.getDeliveryService(httpRequest);
-               assertThat("FQDNToDeliveryServiceMap was expected to have the 
key foo.service01.kabletown.com",
-                               
cacheRegister.getFQDNToDeliveryServiceMap().containsKey("foo.service01.kabletown.com"));
-               assertThat("Returned Delivery Service was expected to have the 
ID service01",
-                               answer.getId().equals("service01"));
-
-
-               httpRequest.setRequestedUrl("http://_.service01.kabletown.com";);
-               answer = cacheRegister.getDeliveryService(httpRequest);
-               assertThat("FQDNToDeliveryServiceMap was expected to have the 
key _.service01.kabletown.com",
-                               
cacheRegister.getFQDNToDeliveryServiceMap().containsKey("_.service01.kabletown.com"));
-               assertThat("Returned Delivery Service was expected to have the 
ID service01",
-                               answer.getId().equals("service01"));
-       }
-
-       @Test
-       public void itReturnsDeliveryServiceFromFQDNMapForDNSRequest() throws 
JsonUtilsException, TextParseException {
-               final Name name = Name.fromString("edge.example.com.");
-               DNSRequest dnsRequest = new DNSRequest("example.com", name, 
Type.A);
-               dnsRequest.setClientIP("10.10.10.10");
-               dnsRequest.setHostname(name.relativize(Name.root).toString());
-
-               Map<String, DeliveryService> map = new HashMap<>();
-
-               ObjectNode node = JsonNodeFactory.instance.objectNode();
-               ArrayNode domainNode = node.putArray("domains");
-               domainNode.add("example.com");
-               node.put("routingName","edge");
-               node.put("coverageZoneOnly", false);
-               DeliveryService ds = new DeliveryService("example", node);
-
-               map.put("edge.example.com", ds);
-               map.put("_.example.com", ds);
-               cacheRegister.setFQDNToDeliveryServiceMap(map);
-
-               DeliveryService answer = 
cacheRegister.getDeliveryService(dnsRequest);
-               assertThat("FQDNToDeliveryServiceMap was expected to have the 
key edge.example.com",
-                               
cacheRegister.getFQDNToDeliveryServiceMap().containsKey("edge.example.com"));
-               assertThat("Returned Delivery Service was expected to have the 
ID example",
-                               answer.getId().equals("example"));
-
-               final Name underscoreName = Name.fromString("_.example.com");
-               dnsRequest = new DNSRequest("example.com", underscoreName, 
Type.A);
-               dnsRequest.setClientIP("10.10.10.10");
-               dnsRequest.setHostname(name.relativize(Name.root).toString());
-               answer = cacheRegister.getDeliveryService(dnsRequest);
-               assertThat("FQDNToDeliveryServiceMap was expected to have the 
key _.example.com",
-                               
cacheRegister.getFQDNToDeliveryServiceMap().containsKey("_.example.com"));
-               assertThat("Returned Delivery Service was expected to have the 
ID example",
-                               answer.getId().equals("example"));
-       }
 }

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