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https://issues.apache.org/jira/browse/HIVE-12248?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14975152#comment-14975152
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Chaoyu Tang commented on HIVE-12248:
------------------------------------
Looks like it duplicate the HIVE-11616
> The rawStore used in DBTokenStore should be thread-safe
> -------------------------------------------------------
>
> Key: HIVE-12248
> URL: https://issues.apache.org/jira/browse/HIVE-12248
> Project: Hive
> Issue Type: Bug
> Components: Authentication
> Reporter: Chaoyu Tang
> Assignee: Chaoyu Tang
>
> A non-thread-safe implementation of RawStore, particularly ObjectStore, set
> in DBTokenStore is being shared by multi-threads, which causes the race
> condition in DataNuclues to access the backend DB.
> The DN PersistenceManager(PM) in ObjectStore is not thread safe, so
> DBTokenStore should use a ThreadLocal ObjectStore.
> Following errors might be root caused by the race condition in DN PM.
> {code}
> Object of type "org.apache.hadoop.hive.metastore.model.MDelegationToken" is
> detached. Detached objects cannot be used with this operation.
> org.datanucleus.exceptions.ObjectDetachedException: Object of type
> "org.apache.hadoop.hive.metastore.model.MDelegationToken" is detached.
> Detached objects cannot be used with this operation.
> at
> org.datanucleus.ExecutionContextImpl.assertNotDetached(ExecutionContextImpl.java:5728)
> at
> org.datanucleus.ExecutionContextImpl.retrieveObject(ExecutionContextImpl.java:1859)
> at
> org.datanucleus.ExecutionContextThreadedImpl.retrieveObject(ExecutionContextThreadedImpl.java:203)
> at
> org.datanucleus.api.jdo.JDOPersistenceManager.jdoRetrieve(JDOPersistenceManager.java:605)
> at
> org.datanucleus.api.jdo.JDOPersistenceManager.retrieveAll(JDOPersistenceManager.java:693)
> at
> org.datanucleus.api.jdo.JDOPersistenceManager.retrieveAll(JDOPersistenceManager.java:713)
> at
> org.apache.hadoop.hive.metastore.ObjectStore.getAllTokenIdentifiers(ObjectStore.java:6517)
>
> {code}
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