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Posted to dev@qpid.apache.org by "ASF subversion and git services (JIRA)" <ji...@apache.org> on 2017/06/09 10:53:19 UTC
[jira] [Commented] (QPID-7811) [Java Broker] Asynchronous message
store recoverer can delete message content for the message enqueued after
broker startup
[ https://issues.apache.org/jira/browse/QPID-7811?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16044301#comment-16044301 ]
ASF subversion and git services commented on QPID-7811:
-------------------------------------------------------
Commit 06dfe565ffe95aee8d0eee246d6c00c1fbf278d7 in qpid-broker-j's branch refs/heads/master from [~alex.rufous]
[ https://git-wip-us.apache.org/repos/asf?p=qpid-broker-j.git;h=06dfe56 ]
QPID-7811: [Java Broker] Ensure that newly enqueued message is not deleted by AsynchronousMessageStoreRecoverer
* prevent deletion of newly enqueued message
* shutdown recoverer executor service after recovery is complete
> [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
>
> Attachments: 0001-QPID-7811-Java-Broker-Ensure-AsynchronousMessageStor.patch
>
>
> {{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) is 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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