Use ConcurrentHashMap in IngressProducerReconcilableStore to avoid Co…

…ncurrentModificationException (#3876)

Co-authored-by: Christoph Stäbler <cstabler@redhat.com>

data-plane/receiver/src/main/java/dev/knative/eventing/kafka/broker/receiver/impl/IngressProducerReconcilableStore.java

@@ -30,10 +30,10 @@
 import io.cloudevents.jackson.JsonFormat;
 import io.cloudevents.kafka.CloudEventSerializer;
 import io.vertx.core.Future;
-import java.util.HashMap;
 import java.util.Map;
 import java.util.Objects;
 import java.util.Properties;
+import java.util.concurrent.ConcurrentHashMap;
 import java.util.function.Function;
 import org.apache.kafka.clients.producer.ProducerConfig;
 import org.slf4j.Logger;
@@ -76,10 +76,10 @@ public IngressProducerReconcilableStore(
         this.producerConfigs = producerConfigs;
         this.producerFactory = producerFactory;
 
-        this.ingressInfos = new HashMap<>();
-        this.producerReferences = new HashMap<>();
-        this.pathMapper = new HashMap<>();
-        this.hostMapper = new HashMap<>();
+        this.ingressInfos = new ConcurrentHashMap<>();
+        this.producerReferences = new ConcurrentHashMap<>();
+        this.pathMapper = new ConcurrentHashMap<>();
+        this.hostMapper = new ConcurrentHashMap<>();
     }
 
     public IngressProducer resolve(String host, String path) {