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https://issues.apache.org/jira/browse/CALCITE-2717?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16704927#comment-16704927
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Julian Hyde commented on CALCITE-2717:
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I'm surprised. I thought soft references won't prevent anything from being
garbage collected; if it's not being garbage collected, it's because there is
some other reference to it outside of the cache. Look for documentation on how
to use a guava cache to intern values.
> Cached traits in RelTraitDef's canonicalMap can't be garbage-collected
> -----------------------------------------------------------------------
>
> Key: CALCITE-2717
> URL: https://issues.apache.org/jira/browse/CALCITE-2717
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: Haisheng Yuan
> Assignee: Julian Hyde
> Priority: Major
>
> Softly-referenced objects will be garbage-collected in a globally
> least-recently-used manner, in response to memory demand. Even though
> canonicalMap's value is soft referenced, key is strong referenced, key and
> value are referencing the same object. So traits in the cache will never be
> garbage-collected, which may cause OOM if we have tons of different traits.
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