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https://issues.apache.org/jira/browse/ARTEMIS-1221?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16068612#comment-16068612
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ASF GitHub Bot commented on ARTEMIS-1221:
-----------------------------------------
Github user asfgit closed the pull request at:
https://github.com/apache/activemq-artemis/pull/1347
> Duplicated ID causes LargeMessage lost at backup
> ------------------------------------------------
>
> Key: ARTEMIS-1221
> URL: https://issues.apache.org/jira/browse/ARTEMIS-1221
> Project: ActiveMQ Artemis
> Issue Type: Bug
> Components: Broker
> Affects Versions: 1.5.5, 2.1.0
> Reporter: Howard Gao
> Assignee: Howard Gao
> Fix For: 1.5.6, 2.2.0
>
>
> When a large message is replicated to backup, a pendingID is generated when
> the large message is finished. This pendingID is generated by a
> BatchingIDGenerator at backup.
> It is possible that a pendingID generated at backup may be a duplicate to an
> ID generated at live server.
> This can cause a problem when a large message with a messageID that is the
> same as another largemessage's pendingID is replicated and stored in the
> backup's journal, and then a deleteRecord for the pendingID is appended.
> If backup becomes live and loads the journal, it will drop the large message
> add record because there is a deleteRecord of the same ID (even though it is
> a pendingID of another message). As a result the expecting client will never
> get this large message.
>
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