[jira] [Commented] (PARQUET-460) Parquet files concat tool

["flykobe cheng (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PARQUET-460?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15130055#comment-15130055 ] 

flykobe cheng commented on PARQUET-460:
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Thank you for your reply, Ryan Blue! It’s what we want! 
And do you mind I wrapper a MergeCommand in parquet-tool, or spark? 

> 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
>
> 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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