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https://issues.apache.org/jira/browse/PARQUET-2374?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17849712#comment-17849712
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Steve Loughran commented on PARQUET-2374:
-----------------------------------------
again, reviewing this. I think the stats should be identified by string, so
they can be expanded. and extracted from the layers underneath without being
restricted to the set of statistics currently collected.
Using an enum means that it's impossible for the layers underneath to push up
values, and forces the layers above to be updated/in sync with every parquet
release.
> Add metrics support for parquet file reader
> -------------------------------------------
>
> Key: PARQUET-2374
> URL: https://issues.apache.org/jira/browse/PARQUET-2374
> Project: Parquet
> Issue Type: Improvement
> Components: parquet-mr
> Affects Versions: 1.13.1
> Reporter: Parth Chandra
> Assignee: Parth Chandra
> Priority: Major
> Fix For: 1.14.0
>
>
> ParquetFileReader is used by many engines - Hadoop, Spark among them. These
> engines report various metrics to measure performance in different
> environments and it is usually useful to be able to get low level metrics out
> of the file reader and writers.
> It would be very useful to allow a simple interface to report the metrics.
> Callers can then implement the interface to record the metrics in any
> subsystem they choose.
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