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https://issues.apache.org/jira/browse/ARTEMIS-1353?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16129769#comment-16129769
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ASF GitHub Bot commented on ARTEMIS-1353:
-----------------------------------------
Github user jbertram commented on the issue:
https://github.com/apache/activemq-artemis/pull/1466
The wait is in ReplicationManager#sendStartSyncMessage. It's essentially
the same kind of thing that's done in
ReplicationManager#sendSynchronizationDone.
BTW, I ran the full test-suite. No regressions.
> Replication packets can get out of order
> ----------------------------------------
>
> Key: ARTEMIS-1353
> URL: https://issues.apache.org/jira/browse/ARTEMIS-1353
> Project: ActiveMQ Artemis
> Issue Type: Bug
> Affects Versions: 2.2.0
> Reporter: Justin Bertram
> Assignee: Justin Bertram
> Fix For: 2.3.0
>
>
> {{ReplicationEndpoint}} my throw a {{NullPointerException}} during initial
> synchronization.
> The issue is caused by incorrect ordering of replication packets. The NPE
> arises when {{ReplicationSyncFileMessage}} packets are sent before
> {{ReplicationStartSyncMessage}} packets.
> Incorrect ordering of replication packets may happen because of
> {{useExecutor}} parameter in the {{sendReplicatePacket}} method.
> {{ReplicationStartSyncMessage}} packets are sent as first, but they are sent
> with {{useExecutor=true}}. Although {{ReplicationSyncFileMessage}} packets
> are sent after {{ReplicationStartSyncMessage}} packets, they are sent with
> {{useExecutor=false}}. So sending of {{ReplicationStartSyncMessage}} packets
> is scheduled to executor and there is no guarantee when the task will be
> executed, whereas {{ReplicationStartSyncMessage}} packets are sent
> immediately.
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