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https://issues.apache.org/jira/browse/PARQUET-460?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17459619#comment-17459619
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Luis Alvarez commented on PARQUET-460:
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Coming back around to this - is this tool available outside of the spark
toolset?
> Parquet files concat tool
> -------------------------
>
> Key: PARQUET-460
> URL: https://issues.apache.org/jira/browse/PARQUET-460
> Project: Parquet
> Issue Type: Improvement
> Components: parquet-mr
> Affects Versions: 1.7.0, 1.8.0
> Reporter: flykobe cheng
> Assignee: flykobe cheng
> Priority: Major
> Fix For: 1.9.0
>
>
> Currently the parquet file generation is time consuming, most of time used
> for serialize and compress. It cost about 10mins to generate a 100MB~ parquet
> file in our scenario. We want to improve write performance without generate
> too many small files, which will impact read performance.
> We propose to:
> 1. generate several small parquet files concurrently
> 2. merge small files to one file: concat the parquet blocks in binary
> (without SerDe), merge footers and modify the path and offset metadata.
> We create ParquetFilesConcat class to finish step 2. It can be invoked by
> parquet.tools.command.ConcatCommand. If this function approved by parquet
> community, we will integrate it in spark.
> It will impact compression and introduced more dictionary pages, but it can
> be improved by adjusting the concurrency of step 1.
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