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From "Alex Rudyy (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (QPID-7811) [Java Broker] Asynchronous message store recoverer can delete message content for the message enqueued after broker startup
Date Mon, 05 Jun 2017 13:09:04 GMT

     [ https://issues.apache.org/jira/browse/QPID-7811?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Alex Rudyy updated QPID-7811:
-----------------------------
    Priority: Blocker  (was: Major)

> [Java Broker] Asynchronous message store recoverer can delete message content for the
message enqueued after broker startup
> ---------------------------------------------------------------------------------------------------------------------------
>
>                 Key: QPID-7811
>                 URL: https://issues.apache.org/jira/browse/QPID-7811
>             Project: Qpid
>          Issue Type: Bug
>          Components: Java Broker
>    Affects Versions: qpid-java-6.0, qpid-java-6.0.1, qpid-java-6.0.2, qpid-java-6.0.3,
qpid-java-6.0.4, qpid-java-6.0.5, qpid-java-6.0.6, qpid-java-6.0.7, qpid-java-6.1, qpid-java-6.1.1,
qpid-java-6.1.2, qpid-java-6.1.3
>            Reporter: Alex Rudyy
>            Priority: Blocker
>             Fix For: qpid-java-broker-7.0.0, qpid-java-6.1.4, qpid-java-6.0.8
>
>
> {{AsynchronousMessageStoreRecoverer}} recovers messages with ID values less than "max
message id" evaluated on broker startup.  On completion of queue recovery, the {{AsynchronousMessageStoreRecoverer}}
iterates over the orphan messages and deletes them. The message is considered orphan when
enqueuing record is not found among recovered enqueuing records and the message id is less
than "max message id evaluated on broker startup".
> When queues have huge backlogs (millions of messages), the recovery can take time. The
messages on other queues can be consumed and published during this time. When messages with
message id equals to ("max message id" - 2)  and less values are consumed, the recoverer can
mistakenly put message with id greater than "max message id evaluated on broker startup" into
orphan messages and the content of such message could be deleted.
> The following code causes such mistaken orphan message detection:
> {code}
> getStoreReader().visitMessages(new MessageHandler()
>             {
>                 @Override
>                 public boolean handle(final StoredMessage<?> storedMessage)
>                 {
>                     long messageNumber = storedMessage.getMessageNumber();
>                     if (!_recoveredMessages.containsKey(messageNumber))
>                     {
>                         messagesToDelete.add(storedMessage);
>                     }
>                     return _continueRecovery.get() && messageNumber < _maxMessageId
- 1;
>                 }
>             });
> {code}
> The message id should be checked before putting message into collection "messagesToDelete"




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