[jira] [Created] (HIVE-25900) Materialized view registry does not clean non existing views at refresh

["Krisztian Kasa (Jira)" <ji...@apache.org>]

Krisztian Kasa created HIVE-25900:
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             Summary: Materialized view registry does not clean non existing views at refresh
                 Key: HIVE-25900
                 URL: https://issues.apache.org/jira/browse/HIVE-25900
             Project: Hive
          Issue Type: Bug
          Components: Materialized views
            Reporter: Krisztian Kasa
            Assignee: Krisztian Kasa


CBO plans of materialized views which are enabled for query rewrite are cached in HS2 (MaterializedViewsCache, HiveMaterializedViewsRegistry)

The registry is refreshed periodically from HMS:
{code:java}
set hive.server2.materializedviews.registry.refresh.period=1500s;
{code}
This functionality is required when multiple HS2 instances are used in a cluster: MV drop operation is served by one of the HS2 instances and the registry is updated at that time in that instance. However other HS2 instances still cache the non-existent view and need to be refreshed by the updater thread.
Currently the updater thread adds new entries, refresh existing ones but does not remove the outdated entries.



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