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https://issues.apache.org/jira/browse/PARQUET-1951?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17249243#comment-17249243
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satish commented on PARQUET-1951:
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Hi [~gszadovszky] Thanks for the feedback. We don't plan to run this on single
machine. We have logic to divide small files in a partition into several
groups. We have to 'stitch' the files in a group into a large file. My initial
implementation (This is in my library, not in parquet) reads entire data in the
group, deserializes and serializes the data to create large file. This is
taking significant amount of time compared to parquet-tools merge primarily
because of serDe. Also, we want to stitch older data files for archival etc.
The data for these files is not queried often, so we are ok with low
performance and we have few workarounds specific to my usecase to workaround
these issues.
I'm happy to contribute to add support for column index or bloom filters (I see
we are adding similar support for other parquet-tools commands).
I also published a PR. [This PR|https://github.com/apache/parquet-mr/pull/847]
is not making significant changes. so hope its acceptable.
> Allow different strategies to combine key values when merging parquet files
> ---------------------------------------------------------------------------
>
> Key: PARQUET-1951
> URL: https://issues.apache.org/jira/browse/PARQUET-1951
> Project: Parquet
> Issue Type: Improvement
> Components: parquet-cli
> Reporter: satish
> Priority: Minor
>
> I work on Apache Hudi project. We store some additional metadata in parquet
> files (key range in the file, for example). So the metadata is different in
> different parquet files that we want to merge these files.
> Here is what I'm thinking:
> 1) Merge command takes additional command line option: --strategy
> <StrategyClassName>.
> 2) We introduce new strategy class in parquet-hadoop to keep the same
> behavior as today.
> We can extend that class and provide our custom implementation.
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