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https://issues.apache.org/jira/browse/PARQUET-1950?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17276914#comment-17276914
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ASF GitHub Bot commented on PARQUET-1950:
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ggershinsky commented on pull request #164:
URL: https://github.com/apache/parquet-format/pull/164#issuecomment-771442874
to add the parquet encryption angle to this discussion. This feature adds
protection of confidentiality and integrity of parquet files (when they have
columns with sensitive data). These security layers will make it difficult to
support many of the legacy features mentioned above, like external chunks or
merging multiple files into a single master file (this interferes with
definition of file integrity). Reading encrypted data is also difficult before
file writing is finished. All of these are not impossible, but challenging, and
would require an explicit scaffolding plus some Thrift format changes. If there
is a strong demand for using encryption with these legacy features, despite
them being deprecated (or with some of the mentioned new features), we can plan
this for future versions of parquet-format, parquet-mr etc.
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> Define core features / compliance level
> ---------------------------------------
>
> Key: PARQUET-1950
> URL: https://issues.apache.org/jira/browse/PARQUET-1950
> Project: Parquet
> Issue Type: New Feature
> Components: parquet-format
> Reporter: Gabor Szadovszky
> Assignee: Gabor Szadovszky
> Priority: Major
>
> Parquet format is getting more and more features while the different
> implementations cannot keep the pace and left behind with some features
> implemented and some are not. In many cases it is also not clear if the
> related feature is mature enough to be used widely or more an experimental
> one.
> These are huge issues that makes hard ensure interoperability between the
> different implementations.
> The following idea came up in a
> [discussion|https://lists.apache.org/thread.html/rde5cba8443487bccd47593ddf5dfb39f69c729d260165cb936a1a289%40%3Cdev.parquet.apache.org%3E].
> Create a now document in the parquet-format repository that lists the "core
> features". This document is versioned by the parquet-format releases. This
> way a certain version of "core features" defines a level of compatibility
> between the different implementations. This version number can be written to
> a new field (e.g. complianceLevel) in the footer. If an implementation writes
> a file with a version in the field it must implement all the related "core
> features" (read and write) and must not use any other features at write
> because it makes the data unreadable by another implementation if only the
> same level of "core features" are implemented.
> For example if we have encoding A listed in the version 1 "core features" but
> encoding B is not then at "complianceLevel = 1" we can use encoding A but we
> cannot use encoding B because it would make the related data unreadable.
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