src/main/core-impl/java/com/mysql/cj/conf/url/ReplicationConnectionUrl.java [59:78]:
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        LinkedList<HostInfo> undefinedHosts = new LinkedList<>();
        for (HostInfo hi : this.hosts) {
            Map<String, String> hostProperties = hi.getHostProperties();
            if (hostProperties.containsKey(PropertyKey.TYPE.getKeyName())) {
                if (TYPE_SOURCE.equalsIgnoreCase(hostProperties.get(PropertyKey.TYPE.getKeyName()))) {
                    this.sourceHosts.add(hi);
                } else if (TYPE_REPLICA.equalsIgnoreCase(hostProperties.get(PropertyKey.TYPE.getKeyName()))) {
                    this.replicaHosts.add(hi);
                } else {
                    undefinedHosts.add(hi);
                }
            } else {
                undefinedHosts.add(hi);
            }
        }
        if (!undefinedHosts.isEmpty()) {
            if (this.sourceHosts.isEmpty()) {
                this.sourceHosts.add(undefinedHosts.removeFirst());
            }
            this.replicaHosts.addAll(undefinedHosts);
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src/main/core-impl/java/com/mysql/cj/conf/url/ReplicationDnsSrvConnectionUrl.java [63:82]:
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        LinkedList<HostInfo> undefinedHosts = new LinkedList<>();
        for (HostInfo hi : this.hosts) {
            Map<String, String> hostProperties = hi.getHostProperties();
            if (hostProperties.containsKey(PropertyKey.TYPE.getKeyName())) {
                if (TYPE_SOURCE.equalsIgnoreCase(hostProperties.get(PropertyKey.TYPE.getKeyName()))) {
                    this.sourceHosts.add(hi);
                } else if (TYPE_REPLICA.equalsIgnoreCase(hostProperties.get(PropertyKey.TYPE.getKeyName()))) {
                    this.replicaHosts.add(hi);
                } else {
                    undefinedHosts.add(hi);
                }
            } else {
                undefinedHosts.add(hi);
            }
        }
        if (!undefinedHosts.isEmpty()) {
            if (this.sourceHosts.isEmpty()) {
                this.sourceHosts.add(undefinedHosts.removeFirst());
            }
            this.replicaHosts.addAll(undefinedHosts);
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