[jira] [Assigned] (SPARK-27041) large partition data cause pyspark with python2.x oom

["Apache Spark (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-27041?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-27041:
------------------------------------

    Assignee:     (was: Apache Spark)

> large partition data cause pyspark with python2.x oom
> -----------------------------------------------------
>
>                 Key: SPARK-27041
>                 URL: https://issues.apache.org/jira/browse/SPARK-27041
>             Project: Spark
>          Issue Type: Bug
>          Components: PySpark
>    Affects Versions: 2.4.0
>            Reporter: David Yang
>            Priority: Major
>
> With large partition, pyspark may exceeds executor memory limit and trigger out of memory for python 2.7.
> This is because map() is used. Unlike in python3.x, python 2.7 map() will generate a list and need to read all data into memory.
> The proposed fix will use imap in python 2.7 and it has been verified.



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