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https://issues.apache.org/jira/browse/HIVE-19027?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jesus Camacho Rodriguez reassigned HIVE-19027:
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> Make materializations invalidation cache work with multiple active remote
> metastores
> ------------------------------------------------------------------------------------
>
> Key: HIVE-19027
> URL: https://issues.apache.org/jira/browse/HIVE-19027
> Project: Hive
> Issue Type: Improvement
> Components: Materialized views
> Affects Versions: 3.0.0
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
> Priority: Major
>
> The main points:
> - Only MVs stored in transactional tables can have a time window value of 0.
> Those are the only MVs that can be guaranteed to not be outdated when a query
> is executed, if we use custom storage handlers to store the materialized
> view, we cannot make any promises.
> - For MVs that +cannot be outdated+, we do not check the metastore. Instead,
> comparison is based on valid write id lists.
> - For MVs that +can be outdated+, we still rely on the invalidation cache.
> ** The window for valid outdated MVs can be specified in intervals of 1
> minute (less than that, it is difficult to have any guarantees about whether
> the MV is actually outdated by less than a minute or not).
> ** The async loading is done every interval / 2 (or probably better, we can
> make it configurable).
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