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https://issues.apache.org/jira/browse/HIVE-20006?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16542060#comment-16542060
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Jesus Camacho Rodriguez commented on HIVE-20006:
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[~ashutoshc], done. Updated HIVE-19027 too.
> Make materializations invalidation cache work with multiple active remote
> metastores
> ------------------------------------------------------------------------------------
>
> Key: HIVE-20006
> URL: https://issues.apache.org/jira/browse/HIVE-20006
> Project: Hive
> Issue Type: Improvement
> Components: Materialized views
> Affects Versions: 3.0.0
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
> Priority: Critical
> Attachments: HIVE-19027.01.patch, HIVE-19027.02.patch,
> HIVE-19027.03.patch, HIVE-19027.04.patch, HIVE-20006.01.patch,
> HIVE-20006.02.patch, HIVE-20006.03.patch, HIVE-20006.04.patch,
> HIVE-20006.05.patch, HIVE-20006.06.patch, HIVE-20006.patch
>
>
> The main points:
> - Only MVs that use transactional tables and are 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 guaranteed to not be outdated when a query is executed.
> - For MVs that +cannot be outdated+, comparison is based on valid write id
> lists.
> - For MVs that +can be outdated+:
> ** The window for valid outdated MVs can be specified in intervals of 1
> minute.
> ** A materialized view is outdated if it was built before that time window
> and any source table has been modified since.
> A time window of -1 means to always use the materialized view for rewriting
> without any checks concerning its validity.
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