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https://issues.apache.org/jira/browse/PARQUET-1261?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gabor Szadovszky reassigned PARQUET-1261:
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Assignee: Robert Kruszewski
> Parquet-format interns strings when reading filemetadata
> --------------------------------------------------------
>
> Key: PARQUET-1261
> URL: https://issues.apache.org/jira/browse/PARQUET-1261
> Project: Parquet
> Issue Type: Bug
> Affects Versions: 1.9.0
> Reporter: Robert Kruszewski
> Assignee: Robert Kruszewski
> Priority: Major
>
> Parquet-format when deserializing metadata will intern strings. References I
> could find suggested that it had been done to reduce memory pressure early
> on. Java (and jvm in particular) went a long way since then and interning is
> generally discouraged, see
> [https://shipilev.net/jvm-anatomy-park/10-string-intern/] for a good
> explanation. What is more since java 8 there's string deduplication
> implemented at GC level per [http://openjdk.java.net/jeps/192.] During our
> usage and testing we found the interning to cause significant gc pressure for
> long running applications due to bigger GC root set.
> This issue proposes removing interning given it's questionable whether it
> should be used in modern jvms.
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