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https://issues.apache.org/jira/browse/SOLR-10550?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Torsten Bøgh Köster updated SOLR-10550:
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Attachment: solr_filefloatsource.patch
> Improve FileFloatSource eviction // reduce FileFloatSource memory footprint
> ---------------------------------------------------------------------------
>
> Key: SOLR-10550
> URL: https://issues.apache.org/jira/browse/SOLR-10550
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: Server
> Affects Versions: 6.5
> Reporter: Torsten Bøgh Köster
> Attachments: solr_filefloatsource.patch
>
>
> As a follow up from {{SOLR-10506}} we found another possible memory leak in
> Solr. The values generated from an {{ExternalFileField}} are cached in a
> static cache inside the {{FileFloatSource}}. That cache caches both a
> {{IndexReader}} and {{FileFloatSource}}s loaded using that {{IndexReader}}.
> Cache eviction is left to the internally used {{WeakHashMap}} or a full
> eviction can be triggered via url. We are dealing with large synonym files
> and word lists stored in managed resources. Those are tied to the
> {{SolrCore}} as described in {{SOLR-10506}}. We're also using
> {{ExternalFileField}}s whose {{FileFloatSource}} are cached in said static
> cache. The {{FileFloatSource}} hold strong (transitive) references to the
> {{SolrCore}} they have been created for.
> After a couple of collection reloads, the cache eviction mechanism of the
> {{WeakHashMap}} gets activated pretty close to heap exhaustion. The patch
> attached adds a mechanism to evict cache entries created in the context of a
> {{SolrCore}} upon it's close using a close hook in the
> {{ExternalFileFieldReloader}}. It furthermore adds a static cache reset
> method for all entries bound to a given {{IndexReader}}. I'm not sure, if the
> added cache resets are too aggressive or executed too often, I'd like to
> leave that to the experts ;-)
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