Maciej Miklas created AMQ-6911:
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Summary: 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
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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