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Posted to issues@spark.apache.org by "Xiangrui Meng (JIRA)" <ji...@apache.org> on 2015/07/14 20:01:05 UTC
[jira] [Updated] (SPARK-8695) TreeAggregation shouldn't be
triggered for 5 partitions
[ https://issues.apache.org/jira/browse/SPARK-8695?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Xiangrui Meng updated SPARK-8695:
---------------------------------
Assignee: (was: Xiangrui Meng)
> TreeAggregation shouldn't be triggered for 5 partitions
> -------------------------------------------------------
>
> Key: SPARK-8695
> URL: https://issues.apache.org/jira/browse/SPARK-8695
> Project: Spark
> Issue Type: Improvement
> Components: MLlib, Spark Core
> Affects Versions: 1.5.0
> Reporter: Xiangrui Meng
> Priority: Minor
>
> If an RDD has 5 partitions, tree aggregation doesn't reduce the wall-clock time. Instead, it introduces scheduling and shuffling overhead. We should update the condition to use tree aggregation (code attached):
> {code}
> while (numPartitions > scale + numPartitions / scale) {
> {code}
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