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From "Jesus Camacho Rodriguez (JIRA)" <j...@apache.org>
Subject [jira] [Work started] (HIVE-20006) Make materializations invalidation cache work with multiple active remote metastores
Date Wed, 27 Jun 2018 07:54:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-20006?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Work on HIVE-20006 started by Jesus Camacho Rodriguez.
------------------------------------------------------
> 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.patch
>
>
> 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the only MVs that can be guaranteed to not be outdated when a query is executed, if we use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  - For MVs that +cannot be outdated+, we do not check the metastore.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  - For MVs that +can be outdated+, we still rely on the invalidation cache.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  ** The window for valid outdated MVs can be specified in intervals of 1 minute (less
than that, it is difficult to have any guarantees about whether the MV is actually outdated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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