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https://issues.apache.org/jira/browse/SPARK-39743?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17572546#comment-17572546
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zhiming she commented on SPARK-39743:
-------------------------------------
[~yeachan153]
Only some more important parameters are supported in spark, such as
`avro.mapred.deflate.level`. Other less important parameters are usually not
supported in spark, such as `avro.mapred.zstd.level` and
`parquet.compression.codec.zstd.level`. Unless there is a special reason.
In addition, the problem you mentioned does exist, and I will modify the
corresponding parameter description in the document later.
> Unable to set zstd compression level while writing parquet files
> ----------------------------------------------------------------
>
> Key: SPARK-39743
> URL: https://issues.apache.org/jira/browse/SPARK-39743
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 3.2.0
> Reporter: Yeachan Park
> Priority: Minor
>
> While writing zstd compressed parquet files, the following setting
> `spark.io.compression.zstd.level` does not have any affect with regards to
> the compression level of zstd.
> All files seem to be written with the default zstd compression level, and the
> config option seems to be ignored.
> Using the zstd cli tool, we confirmed that setting a higher compression level
> for the same file tested in spark resulted in a smaller file.
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