[jira] [Resolved] (IMPALA-7448) Periodically evict recently unused table from catalogd

["Tianyi Wang (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IMPALA-7448?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tianyi Wang resolved IMPALA-7448.
---------------------------------
       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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