diff --git a/src/main/java/org/gcube/accounting/aggregator/RegexRulesAggregator.java b/src/main/java/org/gcube/accounting/aggregator/RegexRulesAggregator.java
index 7210a42..78e4af3 100644
--- a/src/main/java/org/gcube/accounting/aggregator/RegexRulesAggregator.java
+++ b/src/main/java/org/gcube/accounting/aggregator/RegexRulesAggregator.java
@@ -10,6 +10,7 @@ import java.util.concurrent.TimeUnit;
 
 import org.gcube.accounting.datamodel.validations.validators.MatcherReplace;
 import org.gcube.accounting.persistence.AccountingPersistenceConfiguration;
+import org.gcube.documentstore.persistence.ExecutorUtils;
 import org.gcube.documentstore.records.DSMapper;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -21,19 +22,19 @@ public class RegexRulesAggregator implements Runnable {
 	
 	private static final Logger logger = LoggerFactory.getLogger(RegexRulesAggregator.class);
 	
-	private static final ScheduledExecutorService REGEX_REDISCOVERY_POOL;
+	public static final ScheduledExecutorService REGEX_REDISCOVERY_POOL;
 	
 	protected static final String DELAY = "delay";
 	protected static final String TIME_UNIT = "timeUnit";
 	
-	protected static final String REPLACE_RULES = "MatcherReplaceRules";
+	protected static final String MATCHER_REPLACE_RULES = "MatcherReplaceRules";
 	
 	static {
 		
 		REGEX_REDISCOVERY_POOL = Executors.newScheduledThreadPool(50, new ThreadFactory() {
 			
 			private int counter = 0;
-			private static final String prefix = "RegexRediscoveryThread";	 
+			private static final String prefix = "AggregationRegexRediscoveryThread";	 
 	
 			public Thread newThread(Runnable r) {
 			   return new Thread(r, prefix + "-" + counter++);
@@ -53,6 +54,10 @@ public class RegexRulesAggregator implements Runnable {
 	
 	protected static RegexRulesAggregator instance;
 	
+	protected boolean changeRate; 
+	
+	protected ScheduledFuture<?> reloadAggregatorRules;
+	
 	public synchronized static RegexRulesAggregator getInstance() {
 		if(instance==null) {
 			instance = new RegexRulesAggregator();
@@ -62,6 +67,7 @@ public class RegexRulesAggregator implements Runnable {
 	
 	protected RegexRulesAggregator() {
 		matcherReplaceList = new ArrayList<>();
+		changeRate = false;
 		readConfiguration();
 	}
 		
@@ -79,23 +85,35 @@ public class RegexRulesAggregator implements Runnable {
 	}
 	
 	
-	protected ScheduledFuture<?> reloadAggregatorRules;
+	
 	
 	public void readConfiguration() {
 		try {
 			accountingPersistenceConfiguration = new AccountingPersistenceConfiguration(this.getClass());
 			
 			try {
+				long oldDelay = delay;
+				
 				String delayString = accountingPersistenceConfiguration.getProperty(DELAY);
 				delay = Long.parseLong(delayString);
+				if(oldDelay!=delay) {
+					changeRate = true;
+				}
+				
+				TimeUnit oldTimeUnit = timeUnit;
 				
 				String timeUnitString = accountingPersistenceConfiguration.getProperty(TIME_UNIT);
 				timeUnit = TimeUnit.valueOf(timeUnitString.toUpperCase());
+				
+				if(oldTimeUnit.ordinal() != timeUnit.ordinal()) {
+					changeRate = true;
+				}
+				
 			}catch (Exception e) {
 				logger.warn("Unable to retrieve regex reload delay. Goign to use last known delay {} {}", delay, timeUnit.name().toLowerCase());
 			}
 			
-			String rulesString = accountingPersistenceConfiguration.getProperty(REPLACE_RULES);
+			String rulesString = accountingPersistenceConfiguration.getProperty(MATCHER_REPLACE_RULES);
 			ObjectMapper mapper = DSMapper.getObjectMapper();
 			JavaType type = mapper.getTypeFactory().constructCollectionType(List.class, MatcherReplace.class);
 			
@@ -112,9 +130,9 @@ public class RegexRulesAggregator implements Runnable {
 	@Override
 	public void run() {
 		readConfiguration();
-	}
-	
-	public void start() {
+		if(changeRate) {
+			stop();
+		}
 		if(reloadAggregatorRules == null) {
 			reloadAggregatorRules = REGEX_REDISCOVERY_POOL.scheduleAtFixedRate(this, delay, delay, timeUnit);
 		}
@@ -134,4 +152,9 @@ public class RegexRulesAggregator implements Runnable {
 		}
 	}
 	
+	public static void shutdown() {
+		RegexRulesAggregator.getInstance().stop();
+		ExecutorUtils.shutDownPool(RegexRulesAggregator.REGEX_REDISCOVERY_POOL);
+	}
+	
 }
diff --git a/src/main/java/org/gcube/accounting/persistence/AccountingPersistenceFactory.java b/src/main/java/org/gcube/accounting/persistence/AccountingPersistenceFactory.java
index 6964fc2..c5728ed 100644
--- a/src/main/java/org/gcube/accounting/persistence/AccountingPersistenceFactory.java
+++ b/src/main/java/org/gcube/accounting/persistence/AccountingPersistenceFactory.java
@@ -7,6 +7,7 @@ import java.util.HashMap;
 import java.util.Map;
 import java.util.concurrent.TimeUnit;
 
+import org.gcube.accounting.aggregator.RegexRulesAggregator;
 import org.gcube.accounting.datamodel.BasicUsageRecord;
 import org.gcube.accounting.datamodel.aggregation.AggregatedServiceUsageRecord;
 import org.gcube.accounting.datamodel.usagerecords.ServiceUsageRecord;
@@ -16,7 +17,7 @@ import org.gcube.documentstore.persistence.PersistenceBackendFactory;
  * @author Luca Frosini (ISTI - CNR)
  */
 public class AccountingPersistenceFactory {
-
+	
 	private AccountingPersistenceFactory(){}
 	
 	protected final static Map<String, AccountingPersistence> persistences;
@@ -24,7 +25,6 @@ public class AccountingPersistenceFactory {
 	public static void initAccountingPackages(){
 		PersistenceBackendFactory.addRecordPackage(ServiceUsageRecord.class.getPackage());
 		PersistenceBackendFactory.addRecordPackage(AggregatedServiceUsageRecord.class.getPackage());
-		
 	}
 	
 	static {
@@ -60,12 +60,13 @@ public class AccountingPersistenceFactory {
 		AccountingPersistenceFactory.flushAll();
 	}
 	
+	/**
+	 * Flush all accounting data and shutdown connection and scheduled thread
+	 */
 	public static void shutDown(){
-		//flush all and shutdown connection and thread
 		PersistenceBackendFactory.flushAll();
 		PersistenceBackendFactory.shutdown();
-		
-		
+		RegexRulesAggregator.shutdown();
 	}
 	
 	/**