Hi All, I have some questions about OFF_HEAP Caching. In Spark 1.X when we use rdd.persist(StorageLevel.OFF_HEAP),that means rdd caching in Tachyon(Alluxio). However,in Spark 2.X,we can directly use OFF_HEAP For Caching
(https://issues.apache.org/jira/browse/SPARK-13992?jql=project%20%3D%20SPARK%20AND%20text%20~%20%22off-heap%20caching%22). I am confuse about this and I have follow questions: 1.In Spark 2.X, how should we use Tachyon for caching? 2.Is there any reason that must change in this way(I mean use off_heap directly instead of using Tachyon) Thanks a lot!
