diff --git a/dhp-workflows/dhp-dedup-openaire/src/main/resources/eu/dnetlib/dhp/oa/dedup/consistency/oozie_app/config-default.xml b/dhp-workflows/dhp-dedup-openaire/src/main/resources/eu/dnetlib/dhp/oa/dedup/consistency/oozie_app/config-default.xml
index 2e0ed9aee..0980c3731 100644
--- a/dhp-workflows/dhp-dedup-openaire/src/main/resources/eu/dnetlib/dhp/oa/dedup/consistency/oozie_app/config-default.xml
+++ b/dhp-workflows/dhp-dedup-openaire/src/main/resources/eu/dnetlib/dhp/oa/dedup/consistency/oozie_app/config-default.xml
@@ -15,4 +15,8 @@
         <name>oozie.action.sharelib.for.spark</name>
         <value>spark2</value>
     </property>
+    <property>
+        <name>sparkExecutorMemoryOverhead</name>
+        <value>1G</value>
+    </property>
 </configuration>
\ No newline at end of file
diff --git a/dhp-workflows/dhp-dedup-openaire/src/main/resources/eu/dnetlib/dhp/oa/dedup/consistency/oozie_app/workflow.xml b/dhp-workflows/dhp-dedup-openaire/src/main/resources/eu/dnetlib/dhp/oa/dedup/consistency/oozie_app/workflow.xml
index 2302d4b8f..b724e5d0b 100644
--- a/dhp-workflows/dhp-dedup-openaire/src/main/resources/eu/dnetlib/dhp/oa/dedup/consistency/oozie_app/workflow.xml
+++ b/dhp-workflows/dhp-dedup-openaire/src/main/resources/eu/dnetlib/dhp/oa/dedup/consistency/oozie_app/workflow.xml
@@ -18,11 +18,15 @@
         </property>
         <property>
             <name>sparkDriverMemory</name>
-            <description>memory for driver process</description>
+            <description>heap memory for driver process</description>
         </property>
         <property>
             <name>sparkExecutorMemory</name>
-            <description>memory for individual executor</description>
+            <description>heap memory for individual executor</description>
+        </property>
+        <property>
+            <name>sparkExecutorMemoryOverhead</name>
+            <description>off-heap memory for individual executor</description>
         </property>
         <property>
             <name>sparkExecutorCores</name>
@@ -86,6 +90,7 @@
             <jar>dhp-dedup-openaire-${projectVersion}.jar</jar>
             <spark-opts>
                 --executor-memory=${sparkExecutorMemory}
+                --conf spark.executor.memoryOverhead=${sparkExecutorMemoryOverhead}
                 --executor-cores=${sparkExecutorCores}
                 --driver-memory=${sparkDriverMemory}
                 --conf spark.extraListeners=${spark2ExtraListeners}
@@ -111,6 +116,7 @@
             <jar>dhp-dedup-openaire-${projectVersion}.jar</jar>
             <spark-opts>
                 --executor-memory=${sparkExecutorMemory}
+                --conf spark.executor.memoryOverhead=${sparkExecutorMemoryOverhead}
                 --executor-cores=${sparkExecutorCores}
                 --driver-memory=${sparkDriverMemory}
                 --conf spark.extraListeners=${spark2ExtraListeners}
@@ -135,8 +141,9 @@
             <class>eu.dnetlib.dhp.oa.merge.GroupEntitiesSparkJob</class>
             <jar>dhp-dedup-openaire-${projectVersion}.jar</jar>
             <spark-opts>
-                --executor-cores=${sparkExecutorCores}
                 --executor-memory=${sparkExecutorMemory}
+                --conf spark.executor.memoryOverhead=${sparkExecutorMemoryOverhead}
+                --executor-cores=${sparkExecutorCores}
                 --driver-memory=${sparkDriverMemory}
                 --conf spark.extraListeners=${spark2ExtraListeners}
                 --conf spark.sql.queryExecutionListeners=${spark2SqlQueryExecutionListeners}
@@ -159,8 +166,9 @@
             <class>eu.dnetlib.dhp.oa.merge.DispatchEntitiesSparkJob</class>
             <jar>dhp-dedup-openaire-${projectVersion}.jar</jar>
             <spark-opts>
-                --executor-cores=${sparkExecutorCores}
                 --executor-memory=${sparkExecutorMemory}
+                --conf spark.executor.memoryOverhead=${sparkExecutorMemoryOverhead}
+                --executor-cores=${sparkExecutorCores}
                 --driver-memory=${sparkDriverMemory}
                 --conf spark.extraListeners=${spark2ExtraListeners}
                 --conf spark.sql.queryExecutionListeners=${spark2SqlQueryExecutionListeners}