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https://issues.apache.org/jira/browse/HIVE-28551?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17886357#comment-17886357
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Stamatis Zampetakis commented on HIVE-28551:
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HIVE-19154 adds an event based cache invalidation mechanism that is able remove
stale entries from the cache after certain intervals but this is mostly a
performance improvement and not a mechanism to guarantee correctness. The cache
should never return stale entries for transactional tables.
> Stale results when executing queries over recreated transactional tables
> ------------------------------------------------------------------------
>
> Key: HIVE-28551
> URL: https://issues.apache.org/jira/browse/HIVE-28551
> Project: Hive
> Issue Type: Bug
> Security Level: Public(Viewable by anyone)
> Components: HiveServer2
> Affects Versions: 4.0.1
> Reporter: Stamatis Zampetakis
> Assignee: Stamatis Zampetakis
> Priority: Major
>
> SQL queries return stale results from the cache when the tables involved in
> the queries are dropped and then recreated with the same name.
> The problem can be reproduced by executing the following sequence of queries.
> {code:sql}
> CREATE TABLE author (fname STRING) STORED AS ORC
> TBLPROPERTIES('transactional'='true');
> INSERT INTO author VALUES ('Victor');
> SELECT fname FROM author;
> DROP TABLE author;
> CREATE TABLE author (fname STRING) STORED AS ORC
> TBLPROPERTIES('transactional'='true');
> INSERT INTO author VALUES ('Alexander');
> SELECT fname FROM author;
> {code}
> The first execution of the SELECT query correctly returns "Victor" as a
> result.
> The second execution of the SELECT query incorrectly returns "Victor" while
> it should return "Alexander".
> The problem manifestates only when the hive.query.results.cache.enabled is
> set to true.
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