diff --git a/include/query_processor.h b/include/query_processor.h
index a288b10fe..741830589 100644
--- a/include/query_processor.h
+++ b/include/query_processor.h
@@ -111,6 +111,9 @@ struct _Query_Processor_rule_t {
 	void *regex_engine2;
 	uint64_t hits;
 	struct _Query_Processor_rule_t *parent; // pointer to parent, to speed up parent update
+	std::vector<int> * flagOUT_ids;
+	std::vector<int> * flagOUT_weights;
+	int flagOUT_weights_total;
 };
 
 typedef struct _Query_Processor_rule_t QP_rule_t;
diff --git a/lib/Query_Processor.cpp b/lib/Query_Processor.cpp
index 7826fa30a..c09b8edbc 100644
--- a/lib/Query_Processor.cpp
+++ b/lib/Query_Processor.cpp
@@ -425,6 +425,16 @@ static void __delete_query_rule(QP_rule_t *qr) {
 		if (r->re2) { delete r->re2; r->re2=NULL; }
 		free(qr->regex_engine2);
 	}
+	if (qr->flagOUT_ids != NULL) {
+		qr->flagOUT_ids->clear();
+		delete qr->flagOUT_ids;
+		qr->flagOUT_ids = NULL;
+	}
+	if (qr->flagOUT_weights != NULL) {
+		qr->flagOUT_weights->clear();
+		delete qr->flagOUT_weights;
+		qr->flagOUT_weights = NULL;
+	}
 	free(qr);
 };
 
@@ -732,6 +742,40 @@ QP_rule_t * Query_Processor::new_query_rule(int rule_id, bool active, char *user
 			proxy_error("Incorrect digest for rule_id %d : %s\n" , rule_id, digest);
 		}
 	}
+	newQR->flagOUT_weights_total = 0;
+	newQR->flagOUT_ids = NULL;
+	newQR->flagOUT_weights = NULL;
+	if (newQR->attributes != NULL) {
+		if (strlen(newQR->attributes)) {
+		nlohmann::json j_attributes = nlohmann::json::parse(newQR->attributes);
+			if ( j_attributes.find("flagOUTs") != j_attributes.end() ) {
+				newQR->flagOUT_ids = new vector<int>;
+				newQR->flagOUT_weights = new vector<int>;
+				const nlohmann::json& flagOUTs = j_attributes["flagOUTs"];
+				if (flagOUTs.type() == nlohmann::json::value_t::array) {
+					for (auto it = flagOUTs.begin(); it != flagOUTs.end(); it++) {
+						bool parsed = false;
+						const nlohmann::json& j = *it;
+						if (j.find("id") != j.end() && j.find("weight") != j.end()) {
+							if (j["id"].type() == nlohmann::json::value_t::number_unsigned && j["weight"].type() == nlohmann::json::value_t::number_unsigned) {
+								int id = j["id"];
+								int weight = j["weight"];
+								newQR->flagOUT_ids->push_back(id);
+								newQR->flagOUT_weights->push_back(weight);
+								newQR->flagOUT_weights_total += weight;
+								parsed = true;
+							}
+						}
+						if (parsed == false) {
+							proxy_error("Failed to parse flagOUTs in JSON on attributes for rule_id %d : %s\n" , newQR->rule_id, j.dump().c_str());
+						}
+					}
+				} else {
+					proxy_error("Failed to parse flagOUTs attributes for rule_id %d : %s\n" , newQR->rule_id, flagOUTs.dump().c_str());
+				}
+			}
+		}
+	}
 	proxy_debug(PROXY_DEBUG_MYSQL_QUERY_PROCESSOR, 5, "Creating new rule in %p : rule_id:%d, active:%d, username=%s, schemaname=%s, flagIN:%d, %smatch_digest=\"%s\", %smatch_pattern=\"%s\", flagOUT:%d replace_pattern=\"%s\", destination_hostgroup:%d, apply:%d\n", newQR, newQR->rule_id, newQR->active, newQR->username, newQR->schemaname, newQR->flagIN, (newQR->negate_match_pattern ? "(!)" : "") , newQR->match_digest, (newQR->negate_match_pattern ? "(!)" : "") , newQR->match_pattern, newQR->flagOUT, newQR->replace_pattern, newQR->destination_hostgroup, newQR->apply);
 	return newQR;
 };
@@ -1938,12 +1982,26 @@ __internal_loop:
 		// if we arrived here, we have a match
 		qr->hits++; // this is done without atomic function because it updates only the local variables
 		bool set_flagOUT=false;
+		if (qr->flagOUT_weights_total > 0) {
+			int rnd = random() % qr->flagOUT_weights_total;
+			for (unsigned int i=0; i< qr->flagOUT_weights->size(); i++) {
+				int w = qr->flagOUT_weights->at(i);
+				if (rnd < w) {
+					flagIN= qr->flagOUT_ids->at(i);
+					proxy_debug(PROXY_DEBUG_MYSQL_QUERY_PROCESSOR, 5, "query rule %d has changed flagOUT based on weight\n", qr->rule_id);
+					set_flagOUT=true;
+					break;
+				} else {
+					rnd -= w;
+				}
+			}
+		}
 		if (qr->flagOUT >= 0) {
 			proxy_debug(PROXY_DEBUG_MYSQL_QUERY_PROCESSOR, 5, "query rule %d has changed flagOUT\n", qr->rule_id);
 			flagIN=qr->flagOUT;
 			set_flagOUT=true;
 			//sess->query_info.flagOUT=flagIN;
-	    }
+		}
 		if (qr->reconnect >= 0) {
 			// Note: negative reconnect means this rule doesn't change
 			proxy_debug(PROXY_DEBUG_MYSQL_QUERY_PROCESSOR, 5, "query rule %d has set reconnect: %d. Query will%s be rexecuted if connection is lost\n", qr->rule_id, qr->reconnect, (qr->reconnect == 0 ? " NOT" : "" ));