diff --git a/dhp-common/src/main/java/eu/dnetlib/dhp/utils/DHPUtils.java b/dhp-common/src/main/java/eu/dnetlib/dhp/utils/DHPUtils.java
index 5a59bc0dfe..e10d0c500c 100644
--- a/dhp-common/src/main/java/eu/dnetlib/dhp/utils/DHPUtils.java
+++ b/dhp-common/src/main/java/eu/dnetlib/dhp/utils/DHPUtils.java
@@ -75,9 +75,14 @@ public class DHPUtils {
 
 		final HttpGet req = new HttpGet(url);
 
+		log.info("MDStoreManager request: {}", req);
+
 		try (final CloseableHttpClient client = HttpClients.createDefault()) {
 			try (final CloseableHttpResponse response = client.execute(req)) {
 				final String json = IOUtils.toString(response.getEntity().getContent());
+
+				log.info("MDStoreManager response: {}", json);
+
 				final MDStoreWithInfo[] mdstores = objectMapper.readValue(json, MDStoreWithInfo[].class);
 				return Arrays
 					.stream(mdstores)
diff --git a/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/raw/MigrateHdfsMdstoresApplication.java b/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/raw/MigrateHdfsMdstoresApplication.java
index 6c72e4dfc4..ab6f54b92a 100644
--- a/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/raw/MigrateHdfsMdstoresApplication.java
+++ b/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/raw/MigrateHdfsMdstoresApplication.java
@@ -65,11 +65,19 @@ public class MigrateHdfsMdstoresApplication extends AbstractMigrationApplication
 		log.info("isSparkSessionManaged: {}", isSparkSessionManaged);
 
 		final String mdstoreManagerUrl = parser.get("mdstoreManagerUrl");
+		log.info("mdstoreManagerUrl: {}", mdstoreManagerUrl);
+
 		final String mdFormat = parser.get("mdFormat");
+		log.info("mdFormat: {}", mdFormat);
+
 		final String mdLayout = parser.get("mdLayout");
+		log.info("mdLayout: {}", mdLayout);
+
 		final String mdInterpretation = parser.get("mdInterpretation");
+		log.info("mdInterpretation: {}", mdInterpretation);
 
 		final String hdfsPath = parser.get("hdfsPath");
+		log.info("hdfsPath: {}", hdfsPath);
 
 		final Set<String> paths = mdstorePaths(mdstoreManagerUrl, mdFormat, mdLayout, mdInterpretation);
 
@@ -95,6 +103,8 @@ public class MigrateHdfsMdstoresApplication extends AbstractMigrationApplication
 			.filter(p -> HdfsSupport.exists(p, sc.hadoopConfiguration()))
 			.toArray(size -> new String[size]);
 
+		log.info("Processing existing paths {}", Arrays.asList(validPaths));
+
 		if (validPaths.length > 0) {
 			spark
 				.read()