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From "Teemu Torma (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AMQCPP-363) failover: consumer does not always restart properly after reconnect
Date Wed, 20 Apr 2011 19:05:06 GMT

    [ https://issues.apache.org/jira/browse/AMQCPP-363?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13022304#comment-13022304
] 

Teemu Torma commented on AMQCPP-363:
------------------------------------

This is not about durable subscribers, just normal queue consumers.  Besides, it is not just
non-acked messages that are not redelivered, but no more messages are received in case b).
 However, if the broker is again restarted the second time (no non-acked messages since the
consumer is not working at all) the consumer resumes fine. 

We could not reproduce this problem with java client.  Every combination works just fine without
duplicate messages.

> failover: consumer does not always restart properly after reconnect
> -------------------------------------------------------------------
>
>                 Key: AMQCPP-363
>                 URL: https://issues.apache.org/jira/browse/AMQCPP-363
>             Project: ActiveMQ C++ Client
>          Issue Type: Bug
>          Components: CMS Impl
>    Affects Versions: 3.3.0
>         Environment: GNU Linux
>            Reporter: Chris Hoffmann
>            Assignee: Timothy Bish
>            Priority: Critical
>
> Hi,
> While testing AMQCPP-355, we came across a problem when resuming from a broker restart.
Resuming seems to be erratic when the broker shutdown happens during message processing in
an onMessage callback.
> a) if a message is ack'ed while the broker is still down, the same message will be redelivered
after connection resumes. The command tracing does not show the sending of the 1st acknowledgment.

> b) if a message is ack'ed after the broker is brought back (connection resumed OK), the
command tracing shows that the ack is send, but on the broker side we see an warning message:
>  WARN | Ignoring ack received before dispatch; result of failover with an outstanding
ack. Acked messages will be replayed if present on this broker. 
> Ignored ack: MessageAck {commandId = 22, responseRequired = false, ackType = 2, consumerId
= ID:hostname-44923-1303316424844-0:0:0:0,
> firstMessageId = ID:hostname-58084-1303317597544-0:0:0:0:0,
> lastMessageId = ID:hostname-58084-1303317597544-0:0:0:0:0,
> destination = queue://test, transactionId = null, messageCount = 1, poisonCause = null}
> We can't see any redelivery message in the command trace and subsequent messages are
not delivered either. The consumer is nevertheless shown on broker admin console. 
> When the connection is resumed, we see that the prefetch size is set to 0 in the consumerInfo
message.
> c) resuming works fine, if the message is not in process when the shutdown happens.
> Cases a+b work fine, when we tried to reproduce with a java client from the ActiveMQ
examples dir.
> Regards,
> Chris

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