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https://issues.apache.org/jira/browse/HIVE-3521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13666256#comment-13666256
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Jakub Holy commented on HIVE-3521:
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Thank you for the tips, Andy. I have seen similar problem in our Hive 0.9.0
logs regularly in the past few months and had no idea what to do about it. I
did not bother configuring DataNucelus because there is nowhere any information
about 1) Hive requiring that and 2) how it should be configured (nowhere =
Google, Programming Hive).
Anyway, from your comment and the sparse documentation I have figured out that
setting datanucleus.autoStartMechanism to SchemaTable in hive-site.xml might
help. After I restarted Hive, it has created NUCLEUS_TABLES in the database so
it seems to have some effect. I will see in a few weeks/months if it will
indeed fix the problem, i.e. if DataNucleus will load the list of tables from
it on start, avoiding not knowing them later.
For other readers trying to interpret your comment:
* PMF/EMF are JDO's PersistenceManagerFactory / JPA's EntityManagerFactory,
i.e. the classes used to get hold of something actually usable for persisting /
reading stuff
* Regarding the advice of setting datanucleus.PersistenceUnitLoadClassesto true
in hive-site.xml, I don't know enough to be able to apply it. If I read the
docs correctly, it requires datanucleus.PersistenceUnitName to be set to a name
of a persistence-unit defined in a persistence.xml file - but I haven't found
any such file in Hive 0.9.0 (the only JDO-related thing I have found aside of
the metastore connection properties is package.jdo in hive-metastore-0.9.0.jar.
I would appreciate tips for how to use this setting with Hive.
* To me, "locking of your PMF/EMF" seems to be out of question since all that
code is inside Hive and I only use Hive via hiveserver
> Concurrent metastore calls provoke Datanucleus IllegalStateException: "Table
> object has not been been initialised"
> ------------------------------------------------------------------------------------------------------------------
>
> Key: HIVE-3521
> URL: https://issues.apache.org/jira/browse/HIVE-3521
> Project: Hive
> Issue Type: Bug
> Components: Metastore
> Affects Versions: 0.9.0
> Reporter: Carl Steinbach
>
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