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Posted to issues@spark.apache.org by "Hyukjin Kwon (Jira)" <ji...@apache.org> on 2019/10/08 05:42:15 UTC
[jira] [Resolved] (SPARK-24974) Spark put all file's paths into
SharedInMemoryCache even for unused partitions.
[ https://issues.apache.org/jira/browse/SPARK-24974?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Hyukjin Kwon resolved SPARK-24974.
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Resolution: Incomplete
> Spark put all file's paths into SharedInMemoryCache even for unused partitions.
> -------------------------------------------------------------------------------
>
> Key: SPARK-24974
> URL: https://issues.apache.org/jira/browse/SPARK-24974
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.2.1
> Reporter: andrzej.stankevich@gmail.com
> Priority: Major
> Labels: bulk-closed
>
> SharedInMemoryCache has all filestatus no matter whether you specify partition columns or not. It causes long load time for queries that use only couple partitions because Spark loads file's paths for files from all partitions.
> I partitioned files by *report_date* and *type* and i have directory structure like
> {code:java}
> /custom_path/report_date=2018-07-24/type=A/file_1.parquet
> {code}
>
> I am trying to execute
> {code:java}
> val count = spark.read.parquet("/custom_path/report_date=2018-07-24").filter( "type == 'A'").count
> {code}
>
> In my query i need to load only files of type *A* and it is just a couple of files. But spark load all 19K of files from all partitions into SharedInMemoryCache which takes about 60 secs and only after that throws unused partitions.
>
> This could be related to [https://jira.apache.org/jira/browse/SPARK-17994]
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