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https://issues.apache.org/jira/browse/PARQUET-1698?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17014797#comment-17014797
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David Li commented on PARQUET-1698:
-----------------------------------
Probably there are a few layers:
* The file I/O layer should just expose a way for a consumer to hint at what
ranges it's about to read; concurrency can be managed internally (we have some
other optimizations around this though, like what Jacques describes - the
implementation may choose to be more or less aggressive based on system
resources, and readers globally cooperate to distribute bandwidth when scanning
through a partitioned dataset).
* Readers need some way for consumers to hint what columns they actually want,
as Wes described above, which translate into file I/O hints if the format makes
this possible;
* Then at higher levels, we can pass down column hints from the Arrow or
dataset read.
> [C++] Add reader option to pre-buffer entire serialized row group into memory
> -----------------------------------------------------------------------------
>
> Key: PARQUET-1698
> URL: https://issues.apache.org/jira/browse/PARQUET-1698
> Project: Parquet
> Issue Type: Improvement
> Components: parquet-cpp
> Reporter: Wes McKinney
> Assignee: Zherui Cao
> Priority: Major
> Labels: pull-request-available
> Fix For: cpp-1.6.0
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> In some scenarios (example: reading datasets from Amazon S3), reading columns
> independently and allowing unbridled {{Read}} calls to the underlying file
> handle can yield suboptimal performance. In such cases, it may be preferable
> to first read the entire serialized row group into memory then deserialize
> the constituent columns from this
> Note that such an option would not be appropriate as a default behavior for
> all file handle types since low-selectivity reads (example: reading only 3
> columns out of a file with 100 columns) will be suboptimal in some cases. I
> think it would be better for "high latency" file systems to opt into this
> option
> cc [~fsaintjacques] [~bkietz] [~apitrou]
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