diff --git a/src/main/java/org/gcube/data/spd/caching/QueryCache.java b/src/main/java/org/gcube/data/spd/caching/QueryCache.java
index ccb565a..0458683 100644
--- a/src/main/java/org/gcube/data/spd/caching/QueryCache.java
+++ b/src/main/java/org/gcube/data/spd/caching/QueryCache.java
@@ -90,6 +90,7 @@ public class QueryCache<T> implements Serializable{
 				fos = new FileOutputStream(file);
 				deflater = new DeflaterOutputStream(fos, new Deflater(Deflater.BEST_COMPRESSION, true));
 				writer = new ObjectOutputStream(deflater);
+				logger.debug("file created {}",file.getAbsolutePath());
 			} catch (Exception e) {
 				if (file!=null)
 					file.delete();
@@ -117,6 +118,7 @@ public class QueryCache<T> implements Serializable{
 
 	@SuppressWarnings("unchecked")
 	public void getAll(ObjectWriter<T> writer){
+		logger.debug("file to open is {} ",file==null?null:file.getAbsolutePath());
 		try(FileInputStream fis = new FileInputStream(file); InflaterInputStream iis = new InflaterInputStream(fis, new Inflater(true)); ObjectInputStream ois =new ObjectInputStream(iis) ){
 			String obj = null;
 			while (( obj = (String)ois.readObject())!=null && writer.isAlive())
diff --git a/src/main/java/org/gcube/data/spd/resources/Executor.java b/src/main/java/org/gcube/data/spd/resources/Executor.java
index 968a018..baa0b92 100644
--- a/src/main/java/org/gcube/data/spd/resources/Executor.java
+++ b/src/main/java/org/gcube/data/spd/resources/Executor.java
@@ -59,7 +59,6 @@ public class Executor {
 	public String getResultLink(@PathParam("jobKey") String jobKey) throws InvalidIdentifierException {
 		String node;
 		String jobId;
-
 		try{
 			node = extractNode(jobKey);
 			jobId = extractId(jobKey);
@@ -216,22 +215,25 @@ public class Executor {
 	}
 
 	private static String extractNode(String key) throws IdNotValidException{
-		String[] splitted = key.split("\\|\\|");
+		logger.trace("id arrived is {}", key );
+		String[] splitted = key.split("_");
 		if (splitted.length==2)
 			return splitted[0];
 		else throw new IdNotValidException();
 	}
 
 	private static String extractId(String key) throws IdNotValidException{
-		String[] splitted = key.split("\\|\\|");
+		logger.trace("id arrived is {}", key );
+		String[] splitted = key.split("_");
 		if (splitted.length==2)
 			return splitted[1];
 		else throw new IdNotValidException();
 	}
 
 	private String createKey(String id){
+		logger.trace("id arrived is {}", id );
 		String node = cxt.container().profile(HostingNode.class).id();
-		return node+"||"+id;
+		return node+"_"+id;
 	}
 	/*
 	private Executor remoteJobCall(String riId) throws InvalidIdentifierException{