diff --git a/dhp-workflows/dhp-aggregation/src/main/java/eu/dnetlib/dhp/actionmanager/usagestats/SparkAtomicActionUsageJob.java b/dhp-workflows/dhp-aggregation/src/main/java/eu/dnetlib/dhp/actionmanager/usagestats/SparkAtomicActionUsageJob.java
index c284ad8bd..9428f5c59 100644
--- a/dhp-workflows/dhp-aggregation/src/main/java/eu/dnetlib/dhp/actionmanager/usagestats/SparkAtomicActionUsageJob.java
+++ b/dhp-workflows/dhp-aggregation/src/main/java/eu/dnetlib/dhp/actionmanager/usagestats/SparkAtomicActionUsageJob.java
@@ -9,7 +9,10 @@ import java.util.Arrays;
 import java.util.List;
 import java.util.Optional;
 
+import eu.dnetlib.dhp.schema.action.AtomicAction;
 import org.apache.commons.io.IOUtils;
+import org.apache.hadoop.io.Text;
+import org.apache.hadoop.mapred.SequenceFileOutputFormat;
 import org.apache.spark.SparkConf;
 import org.apache.spark.api.java.function.MapFunction;
 import org.apache.spark.api.java.function.MapGroupsFunction;
@@ -29,6 +32,7 @@ import eu.dnetlib.dhp.schema.oaf.DataInfo;
 import eu.dnetlib.dhp.schema.oaf.Measure;
 import eu.dnetlib.dhp.schema.oaf.Result;
 import eu.dnetlib.dhp.schema.oaf.utils.OafMapperUtils;
+import scala.Tuple2;
 
 /**
  * created the Atomic Action for each type of results
@@ -73,7 +77,7 @@ public class SparkAtomicActionUsageJob implements Serializable {
 			spark -> {
 				removeOutputDir(spark, outputPath);
 				prepareResults(dbname, spark, workingPath);
-				prepareActionSet(spark, workingPath, outputPath);
+				writeActionSet(spark, workingPath, outputPath);
 			});
 	}
 
@@ -89,7 +93,7 @@ public class SparkAtomicActionUsageJob implements Serializable {
 			.json(workingPath);
 	}
 
-	public static void prepareActionSet(SparkSession spark, String inputPath, String outputPath) {
+	public static void writeActionSet(SparkSession spark, String inputPath, String outputPath) {
 		readPath(spark, inputPath, UsageStatsModel.class)
 			.groupByKey((MapFunction<UsageStatsModel, String>) us -> us.getResult_id(), Encoders.STRING())
 			.mapGroups((MapGroupsFunction<String, UsageStatsModel, Result>) (k, it) -> {
@@ -105,10 +109,13 @@ public class SparkAtomicActionUsageJob implements Serializable {
 				res.setMeasures(getMeasure(first.getDownloads(), first.getViews()));
 				return res;
 			}, Encoders.bean(Result.class))
-			.write()
-			.mode(SaveMode.Overwrite)
-			.option("compression", "gzip")
-			.json(outputPath);
+				.toJavaRDD()
+				.map(p -> new AtomicAction(p.getClass(), p))
+				.mapToPair(
+						aa -> new Tuple2<>(new Text(aa.getClazz().getCanonicalName()),
+								new Text(OBJECT_MAPPER.writeValueAsString(aa))))
+				.saveAsHadoopFile(outputPath, Text.class, Text.class, SequenceFileOutputFormat.class);
+
 	}
 
 	private static List<Measure> getMeasure(Long downloads, Long views) {
diff --git a/dhp-workflows/dhp-aggregation/src/test/java/eu/dnetlib/dhp/actionmanager/usagestats/SparkAtomicActionCountJobTest.java b/dhp-workflows/dhp-aggregation/src/test/java/eu/dnetlib/dhp/actionmanager/usagestats/SparkAtomicActionCountJobTest.java
index 7cc9eb326..1af408629 100644
--- a/dhp-workflows/dhp-aggregation/src/test/java/eu/dnetlib/dhp/actionmanager/usagestats/SparkAtomicActionCountJobTest.java
+++ b/dhp-workflows/dhp-aggregation/src/test/java/eu/dnetlib/dhp/actionmanager/usagestats/SparkAtomicActionCountJobTest.java
@@ -8,14 +8,12 @@ import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.stream.Collectors;
 
+import eu.dnetlib.dhp.schema.action.AtomicAction;
 import org.apache.commons.io.FileUtils;
 import org.apache.hadoop.io.Text;
 import org.apache.spark.SparkConf;
 import org.apache.spark.api.java.JavaRDD;
 import org.apache.spark.api.java.JavaSparkContext;
-import org.apache.spark.sql.Dataset;
-import org.apache.spark.sql.Encoders;
-import org.apache.spark.sql.Row;
 import org.apache.spark.sql.SparkSession;
 import org.junit.jupiter.api.AfterAll;
 import org.junit.jupiter.api.Assertions;
@@ -26,8 +24,6 @@ import org.slf4j.LoggerFactory;
 
 import com.fasterxml.jackson.databind.ObjectMapper;
 
-import eu.dnetlib.dhp.actionmanager.bipfinder.SparkAtomicActionScoreJob;
-import eu.dnetlib.dhp.schema.action.AtomicAction;
 import eu.dnetlib.dhp.schema.oaf.Result;
 
 public class SparkAtomicActionCountJobTest {
@@ -72,19 +68,20 @@ public class SparkAtomicActionCountJobTest {
 	@Test
 	void testMatch() {
 		String usageScoresPath = getClass()
-			.getResource("/eu/dnetlib/dhp/actionmanager/usagestats/usagestatsdb")
-			.getPath();
+				.getResource("/eu/dnetlib/dhp/actionmanager/usagestats/usagestatsdb")
+				.getPath();
 
-		SparkAtomicActionUsageJob.prepareActionSet(spark, usageScoresPath, workingDir.toString() + "/actionSet");
+		SparkAtomicActionUsageJob.writeActionSet(spark, usageScoresPath, workingDir.toString() + "/actionSet");
 
 		final JavaSparkContext sc = new JavaSparkContext(spark.sparkContext());
 
-		JavaRDD<Result> tmp = sc
-			.textFile(workingDir.toString() + "/actionSet")
-			.map(usm -> OBJECT_MAPPER.readValue(usm, Result.class));
+		JavaRDD<Result> tmp = sc.sequenceFile(workingDir.toString() + "/actionSet", Text.class, Text.class)
+				.map(usm -> OBJECT_MAPPER.readValue(usm._2.getBytes(), AtomicAction.class))
+				.map(aa -> (Result) aa.getPayload());
 
 		Assertions.assertEquals(9, tmp.count());
 
+
 		tmp.foreach(r -> Assertions.assertEquals(2, r.getMeasures().size()));
 		tmp
 			.foreach(