Hi, Any pointers on why the MapReduce Terasort job is slower on Java 11 compared with Java 8. Input data, Configs, Number of Worker Nodes, Node instance type, Hadoop version and Resources are the same in both the runs. Have compared App logs of both good and bad runs and observed Avg Task (both Map and Reduce) time is slower in Java 11.
*Java 8 : **7 min 2 secs * hadoop jar /usr/lib/hadoop-mapreduce/hadoop-mapreduce-examples.jar terasort -Dmapred.reduce.tasks=120 /tmp/terasort/127130b1-ceb0-422c-a957-48c651b20f30/input/ /tmp/terasort/127130b1-ceb0-422c-a957-48c651b20f30/output/ 2022-11-23 12:22:41,948 INFO terasort.TeraSort: starting 2022-11-23 12:29:59,520 INFO terasort.TeraSort: done *Java 11 : 9 min 37 secs * [hadoop@ip-172-31-60-208 ~]$ hadoop jar /usr/lib/hadoop-mapreduce/hadoop-mapreduce-examples.jar terasort -Dmapred.reduce.tasks=120 /tmp/terasort/127130b1-ceb0-422c-a957-48c651b20f30/input/ /tmp/terasort/127130b1-ceb0-422c-a957-48c651b20f30/output/ 2022-11-23 12:22:44,167 INFO terasort.TeraSort: starting 2022-11-23 12:32:21,791 INFO terasort.TeraSort: done Thanks, Prabhu Joseph
