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Posted to issues@spark.apache.org by "Dongjoon Hyun (Jira)" <ji...@apache.org> on 2020/02/04 20:04:00 UTC
[jira] [Updated] (SPARK-30712) Estimate sizeInBytes from file
metadata for parquet files
[ https://issues.apache.org/jira/browse/SPARK-30712?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Dongjoon Hyun updated SPARK-30712:
----------------------------------
Affects Version/s: (was: 3.0.0)
3.1.0
> Estimate sizeInBytes from file metadata for parquet files
> ---------------------------------------------------------
>
> Key: SPARK-30712
> URL: https://issues.apache.org/jira/browse/SPARK-30712
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.1.0
> Reporter: liupengcheng
> Priority: Major
>
> Currently, Spark will use a compressionFactor when calculating `sizeInBytes` for `HadoopFsRelation`, but this is not accurate and it's hard to choose the best `compressionFactor`. Sometimes, this can causing OOMs due to improper BroadcastHashJoin.
> So I propose to use the rowCount in the BlockMetadata to estimate the size in memory, which can be more accurate.
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