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https://issues.apache.org/jira/browse/IMPALA-7448?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tianyi Wang resolved IMPALA-7448.
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Resolution: Fixed
Fix Version/s: Impala 3.1.0
> Periodically evict recently unused table from catalogd
> ------------------------------------------------------
>
> Key: IMPALA-7448
> URL: https://issues.apache.org/jira/browse/IMPALA-7448
> Project: IMPALA
> Issue Type: Improvement
> Components: Catalog
> Affects Versions: Impala 3.1.0
> Reporter: Tianyi Wang
> Assignee: Tianyi Wang
> Priority: Major
> Fix For: Impala 3.1.0
>
>
> To limit the memory consumption of catalog, we should experiment with a
> mechanism automatically evicting recently unused tables from catalogd.
> Initial design:
> - impalad to report periodically/asynchronously the set of catalog objects
> that were accessed
> - catalogd to record some kind of last access time
> - catalogd to have some facility to scan over all catalog objects, collect
> some number of not-recently-used ones (eg to reach a target amount of evicted
> memory), and issue invalidate commands to itself
> - no need to have exact LRU behavior -- to simplify, we probably shouldn't
> try to do a classical LRU linked list between all catalog objects.
> - initial patch probably just triggered manually. Discussed either running
> this on a schedule or running this based on JMX GC notifications if we see
> that the catalogd finished an old-gen GC and the old gen is more than some
> target percentage full.
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