Details
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Bug
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Status: Resolved
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Major
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Resolution: Duplicate
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None
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None
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Description
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.
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)
Attachments
Issue Links
- duplicates
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- Closed
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