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https://issues.apache.org/jira/browse/HIVE-22284?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ádám Szita reassigned HIVE-22284:
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> Improve LLAP CacheContentsTracker to collect and display correct statistics
> ---------------------------------------------------------------------------
>
> Key: HIVE-22284
> URL: https://issues.apache.org/jira/browse/HIVE-22284
> Project: Hive
> Issue Type: Improvement
> Components: llap
> Reporter: Ádám Szita
> Assignee: Ádám Szita
> Priority: Major
>
> When keeping track of which buffers correspond to what Hive objects,
> CacheContentsTracker relies on cache tags.
> Currently a tag is a simple String that ideally holds DB and table name, and
> a partition spec concatenated by . and / . The information here is derived
> from the Path of the file that is getting cached. Needless to say sometimes
> this produces a wrong tag especially for external tables.
> Also there's a bug when calculating aggregated stats for a 'parent' tag
> (corresponding to the table of the partition) because the overall maxCount
> and maxSize do not add up to the sum of those in the partitions. This happens
> when buffers get removed from the cache.
>
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