[jira] [Created] (PARQUET-2152) zstd compressor and decompressor use the same configuration

["Peidian Li (Jira)" <ji...@apache.org>]

Peidian Li created PARQUET-2152:
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             Summary: zstd compressor and decompressor use the same configuration
                 Key: PARQUET-2152
                 URL: https://issues.apache.org/jira/browse/PARQUET-2152
             Project: Parquet
          Issue Type: Bug
          Components: parquet-mr
    Affects Versions: 1.12.2
            Reporter: Peidian Li


I use spark to rewrite the parquet files that are compressed by zstd. And the parquet version is  1.12.2. I want to read the parquet files compressed by level 3 and compress them on another level. But the level can't be changed.
After I check the source, I found the problem was the codec was cached, and the configuration will not be updated:
[https://github.com/apache/parquet-mr/blob/master/parquet-hadoop/src/main/java/org/apache/parquet/hadoop/CodecFactory.java#L144]

[https://github.com/apache/parquet-mr/blob/master/parquet-hadoop/src/main/java/org/apache/parquet/hadoop/CodecFactory.java#L226]

I think the problem is important. I found it when I try to use a different level to compaction the files in the iceberg table. Asynchronous rewriting with a higher level can lead to higher compression ratio. This is important to save storage costs.



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