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From "ASF subversion and git services (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (QPID-7811) [Java Broker] Asynchronous message store recoverer can delete message content for the message enqueued after broker startup
Date Fri, 09 Jun 2017 16:08:18 GMT

    [ https://issues.apache.org/jira/browse/QPID-7811?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16044598#comment-16044598
] 

ASF subversion and git services commented on QPID-7811:
-------------------------------------------------------

Commit f03a3c460b1782688627588fcb646df6a9a537e6 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=f03a3c4 ]

QPID-7811: Improve test to verify that last stored orphaned message is removed


> [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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