[jira] [Closed] (AMQ-6911) Constraint violation on failover (Postgresql)

["Maciej Miklas (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/AMQ-6911?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Maciej Miklas closed AMQ-6911.
------------------------------
    Resolution: Not A Bug

Out JDBC configuration was incorrect - autocommit was set to false, and in result messages were propagated in DB with delay.

> 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: 5.15.2
>            Reporter: Maciej Miklas
>            Priority: Major
>
> We have ActiveMq 5.15.2 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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