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https://issues.apache.org/jira/browse/PARQUET-2122?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17534123#comment-17534123
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Micah Kornfield commented on PARQUET-2122:
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I believe the answer is the Bloom filter implementation isn't adaptive, so it
simply preallocates all the bytes necessary. It would certainly be a nice
option to have more adaptive data structures that can scale down for smaller
files but is probably a decent amount of work to build consensus around this.
> Adding Bloom filter to small Parquet file bloats in size X1700
> --------------------------------------------------------------
>
> Key: PARQUET-2122
> URL: https://issues.apache.org/jira/browse/PARQUET-2122
> Project: Parquet
> Issue Type: Bug
> Components: parquet-cli, parquet-mr
> Affects Versions: 1.13.0
> Reporter: Ze'ev Maor
> Priority: Critical
> Attachments: data.csv, data_index_bloom.parquet
>
>
> Converting a small, 14 rows/1 string column csv file to Parquet without bloom
> filter yields a 600B file, adding '.withBloomFilterEnabled(true)' to
> ParquetWriter then yields a 1049197B file.
> It isn't clear what the extra space is used by.
> Attached csv and bloated Parquet files.
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