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https://issues.apache.org/jira/browse/AMQ-6911?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16389741#comment-16389741
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Maciej Miklas commented on AMQ-6911:
------------------------------------

sorry - that was typo - we have 5.15.2

> Constraint violation on failover (Postgresql)
> ---------------------------------------------
>
>                 Key: AMQ-6911
>                 URL: https://issues.apache.org/jira/browse/AMQ-6911
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: JDBC
>    Affects Versions: 5.15.3
>            Reporter: Maciej Miklas
>            Priority: Major
>
> We have ActiveMq 5.12 in following configuration:
>  * PostgreSQL for persistance
>  * two Nodes, one in Standby
>  * JDBC Master Slave with shared Database
>  * static cluster discovery
> Everything seams to be fine, failover works as expected, but sometimes during 
> failover we are observing following exception:
> {code:java}
>  28.02.2018 09:28:54,207 WARN  [ActiveMQ NIO Worker 6] 
> org.apache.activemq.transaction.LocalTransaction  - Store COMMIT 
> FAILED:java.io.IOException: Batch entry 2 INSERT INTO ACTIVEMQ_MSGS(ID, 
> MSGID_PROD, MSGID_SEQ, CONTAINER, EXPIRATION, PRIORITY, MSG, XID) VALUES 
> (7095330, 'xxx-1-1519303952070-3:862:8:1', 15, 'queue://abc', 1520411334073, 
> 4, ?, NULL) was aborted: FEHLER: doppelter Schl▒sselwert verletzt 
> Unique-Constraint ▒activemq_msgs_pkey▒  Detail: Schl▒ssel ▒(id)=(7095330)▒ 
> existiert bereits.  Call getNextException to see other errors in the batch.   
>      at 
> org.apache.activemq.util.IOExceptionSupport.create(IOExceptionSupport.java:46)
>         at 
> org.apache.activemq.store.jdbc.TransactionContext.commit(TransactionContext.java:209)
>         at 
> org.apache.activemq.store.jdbc.JDBCPersistenceAdapter.commitTransaction(JDBCPersistenceAdapter.java:516)
>         at 
> org.apache.activemq.store.memory.MemoryTransactionStore$Tx.commit(MemoryTransactionStore.java:113)
>         at 
> org.apache.activemq.store.memory.MemoryTransactionStore.commit(MemoryTransactionStore.java:270){code}
> ActiveMQ propagates this exception directly to the client.
> I am assuming, that due to a failover some clients did not get acknowledgment 
> and message has been resent to a new node.
> If I am correct ActiveMq should just ignore duplicated message, or both 
> messages should be stored in database. But latest it's not possible, because  
> ACTIVEMQ_MSGS#ID is a PK
>  



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