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zhengruifeng edited comment on SPARK-21436 at 7/26/18 7:38 AM: --------------------------------------------------------------- [~holdenk] It looks like that {{distinct}} already {color:#333333}utilized the known{color} partitioner. \{{distinct}} calls {color:#333333}{{{color:#ffc66d}combineByKeyWithClassTag}} internally, and will avoid the shuffle if rdd's partitioner is equal to a hash partitioner with same #partitions.{color}{color} Or do you mean that we need to expose some API like {{distinct(partitioner: Partitioner)}} for other kinds of partitioners like \{{RangePartitioner}}? was (Author: podongfeng): [~holdenk] It looks like that \{{distinct}} already utilized the known partitioner. \{distinct} calls \{{color:#ffc66d}{color:#333333}combineByKeyWithClassTag} internally, and will avoid the shuffle if rdd's partitioner is equal to a hash partitioner with same #partitions.{color} Or do you mean that we need to expose some API like \{distinct(partitioner: Partitioner)} for other kinds of partitioners like \{RangePartitioner}? > Take advantage of known partioner for distinct on RDDs > ------------------------------------------------------ > > Key: SPARK-21436 > URL: https://issues.apache.org/jira/browse/SPARK-21436 > Project: Spark > Issue Type: Improvement > Components: Spark Core > Affects Versions: 2.3.0 > Reporter: holdenk > Priority: Minor > > If we have a known partitioner we should be able to avoid the shuffle. -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org