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Posted to issues@spark.apache.org by "Gengliang Wang (JIRA)" <ji...@apache.org> on 2018/01/09 12:09:00 UTC
[jira] [Created] (SPARK-23005) Improve RDD.take on small number of
partitions
Gengliang Wang created SPARK-23005:
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Summary: Improve RDD.take on small number of partitions
Key: SPARK-23005
URL: https://issues.apache.org/jira/browse/SPARK-23005
Project: Spark
Issue Type: Improvement
Components: Spark Core
Affects Versions: 2.2.1
Reporter: Gengliang Wang
In current implementation of RDD.take, we overestimate the number of partitions we need to try by 50%:
`(1.5 * num * partsScanned / buf.size).toInt`
However, when the number is small, the result of `.toInt` is not what we want.
E.g, 2.9 will become 2, which should be 3.
Use math.Ceil fix the problem.
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