forces executor Executor memory and driver executor memory to be 7G (trying to avoid OOM)

dhp-workflows/dhp-doiboost/src/main/resources/eu/dnetlib/dhp/doiboost/oozie_app/workflow.xml

@@ -154,9 +154,9 @@
             <class>eu.dnetlib.doiboost.crossref.GenerateCrossrefDataset</class>
             <jar>dhp-doiboost-${projectVersion}.jar</jar>
             <spark-opts>
-                --executor-memory=${sparkExecutorMemory}
-                --executor-cores=2
-                --driver-memory=${sparkDriverMemory}
+                --executor-memory=7G
+                --executor-cores=4
+                --driver-memory=7G
                 --conf spark.sql.shuffle.partitions=3840
                 --conf spark.extraListeners=${spark2ExtraListeners}
                 --conf spark.sql.queryExecutionListeners=${spark2SqlQueryExecutionListeners}