Hello,
I built a prototype that uses join and groupBy operations via Spark RDD API. Recently I migrated it to the Dataset API. Now it runs much slower than with the original RDD implementation. Did I do something wrong here? Or is this the price I have to pay for the more convienient API? Is there a known solution to deal with this effect (eg configuration via "spark.sql.shuffle.partitions" - but how could I determine the correct value)? In my prototype I use Java Beans with a lot of attributes. Does this slow down Spark-operations with Datasets? Here I have an simple example, that shows the difference: (See attached file: JoinGroupByTest.zip) - I build 2 RDDs and join and group them. Afterwards I count and display the joined RDDs. (Method de.testrddds.JoinGroupByTest.joinAndGroupViaRDD () ) - When I do the same actions with Datasets it takes approximately 40 times as long (Method de.testrddds.JoinGroupByTest.joinAndGroupViaDatasets()). Thank you very much for your help. Matthias PS: See the appended screenshots taken from Spark UI (jobs 0/1 belong to RDD implementation, jobs 2/3 to Dataset): Fiducia & GAD IT AG | www.fiduciagad.de AG Frankfurt a. M. HRB 102381 | Sitz der Gesellschaft: Hahnstr. 48, 60528 Frankfurt a. M. | USt-IdNr. DE 143582320 Vorstand: Klaus-Peter Bruns (Vorsitzender), Claus-Dieter Toben (stv. Vorsitzender), Jens-Olaf Bartels, Martin Beyer, Jörg Dreinhöfer, Wolfgang Eckert, Carsten Pfläging, Jörg Staff Vorsitzender des Aufsichtsrats: Jürgen Brinkmann 2D782357.gif (62K) <http://apache-spark-user-list.1001560.n3.nabble.com/attachment/27449/0/2D782357.gif> 2D546574.gif (98K) <http://apache-spark-user-list.1001560.n3.nabble.com/attachment/27449/1/2D546574.gif> 2D310440.gif (126K) <http://apache-spark-user-list.1001560.n3.nabble.com/attachment/27449/2/2D310440.gif> JoinGroupByTest.zip (5K) <http://apache-spark-user-list.1001560.n3.nabble.com/attachment/27449/3/JoinGroupByTest.zip> -- View this message in context: http://apache-spark-user-list.1001560.n3.nabble.com/Are-join-groupBy-operations-with-wide-Java-Beans-using-Dataset-API-much-slower-than-using-RDD-API-tp27449.html Sent from the Apache Spark User List mailing list archive at Nabble.com.
