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not remove the outdated entries.
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