package eu.dnetlib.dhp.oa.provision; import static eu.dnetlib.dhp.common.SparkSessionSupport.runWithSparkSession; import java.util.HashSet; import java.util.Optional; import java.util.Set; import org.apache.commons.io.IOUtils; import org.apache.spark.SparkConf; import org.apache.spark.api.java.JavaRDD; import org.apache.spark.api.java.JavaSparkContext; import org.apache.spark.rdd.RDD; import org.apache.spark.sql.Encoders; import org.apache.spark.sql.SaveMode; import org.apache.spark.sql.SparkSession; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import com.fasterxml.jackson.databind.ObjectMapper; import com.google.common.base.Splitter; import com.google.common.collect.Iterables; import com.google.common.collect.Sets; import eu.dnetlib.dhp.application.ArgumentApplicationParser; import eu.dnetlib.dhp.common.HdfsSupport; import eu.dnetlib.dhp.oa.provision.model.SortableRelationKey; import eu.dnetlib.dhp.oa.provision.utils.RelationPartitioner; import eu.dnetlib.dhp.schema.oaf.Relation; import scala.Tuple2; /** * Joins the graph nodes by resolving the links of distance = 1 to create an adjacency list of linked objects. The * operation considers all the entity types (publication, dataset, software, ORP, project, datasource, organization, and * all the possible relationships (similarity links produced by the Dedup process are excluded). *
* The operation is implemented by sequentially joining one entity type at time (E) with the relationships (R), and * again by E, finally grouped by E.id; *
* The workflow is organized in different parts aimed to to reduce the complexity of the operation 1) * PrepareRelationsJob: only consider relationships that are not virtually deleted ($.dataInfo.deletedbyinference == * false), each entity can be linked at most to 100 other objects *
* 2) JoinRelationEntityByTargetJob: (phase 1): prepare tuples [relation - target entity] (R - T): for each entity type * E_i map E_i as RelatedEntity T_i to simplify the model and extracting only the necessary information join (R.target = * T_i.id) save the tuples (R_i, T_i) (phase 2): create the union of all the entity types E, hash by id read the tuples * (R, T), hash by R.source join E.id = (R, T).source, where E becomes the Source Entity S save the tuples (S, R, T) *
* 3) AdjacencyListBuilderJob: given the tuple (S - R - T) we need to group by S.id -> List [ R - T ], mapping the * result as JoinedEntity *
* 4) XmlConverterJob: convert the JoinedEntities as XML records
*/
public class PrepareRelationsJob {
private static final Logger log = LoggerFactory.getLogger(PrepareRelationsJob.class);
private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper();
public static final int MAX_RELS = 100;
public static final int DEFAULT_NUM_PARTITIONS = 3000;
public static void main(String[] args) throws Exception {
String jsonConfiguration = IOUtils
.toString(
PrepareRelationsJob.class
.getResourceAsStream(
"/eu/dnetlib/dhp/oa/provision/input_params_prepare_relations.json"));
final ArgumentApplicationParser parser = new ArgumentApplicationParser(jsonConfiguration);
parser.parseArgument(args);
Boolean isSparkSessionManaged = Optional
.ofNullable(parser.get("isSparkSessionManaged"))
.map(Boolean::valueOf)
.orElse(Boolean.TRUE);
log.info("isSparkSessionManaged: {}", isSparkSessionManaged);
String inputRelationsPath = parser.get("inputRelationsPath");
log.info("inputRelationsPath: {}", inputRelationsPath);
String outputPath = parser.get("outputPath");
log.info("outputPath: {}", outputPath);
int relPartitions = Optional
.ofNullable(parser.get("relPartitions"))
.map(Integer::valueOf)
.orElse(DEFAULT_NUM_PARTITIONS);
log.info("relPartitions: {}", relPartitions);
Set