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https://issues.apache.org/jira/browse/AMQ-9855?focusedWorklogId=1005153&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-1005153
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ASF GitHub Bot logged work on AMQ-9855:
---------------------------------------
Author: ASF GitHub Bot
Created on: 13/Feb/26 23:14
Start Date: 13/Feb/26 23:14
Worklog Time Spent: 10m
Work Description: cshannon commented on PR #1659:
URL: https://github.com/apache/activemq/pull/1659#issuecomment-3900042408
The only other thing that I keep thinking is if we are going to go ahead and
add synchronization here it would be nice to better understand why the issue
happens at all. Just thinking about it more there really shouldn't be anything
else touching the message when it is copied during dispatch and then each
consumer should have its own copy so it makes me wonder if there's something
else weird about camel or something that is triggering multiple threads to
touch the message at the same time. Clients also have the ability to disable
copying during send which could be an issue if set.
Mostly I just want to make sure that we are solving an issue with the actual
broker and not a weird setup that is causing it.
Issue Time Tracking
-------------------
Worklog Id: (was: 1005153)
Time Spent: 5h (was: 4h 50m)
> Intermittent null/empty body when consuming from a topic (vm:// transport)
> --------------------------------------------------------------------------
>
> Key: AMQ-9855
> URL: https://issues.apache.org/jira/browse/AMQ-9855
> Project: ActiveMQ
> Issue Type: Bug
> Components: AMQP, Camel
> Affects Versions: 6.2.0, 6.1.2, 6.1.6, 6.1.7
> Reporter: JJ
> Priority: Major
> Fix For: 6.3.0
>
> Time Spent: 5h
> Remaining Estimate: 0h
>
> Also see AMQ-6708 This is very much the same issue but with more details. The
> op on that ticket hasn't been seen since 2017.
> We have a simple AMQ instance using Camel; It connects to an upstream remote
> server via OpenWire and subscribes to topics. It Bridges those topics to the
> local AMQ with some later Camel processing.
> The route looks like this:
> <route id="Route_SPLITTER">
> <from uri="remoteServer:topic:TOPIC_A?durableSubscriptionName=some.user"/>
> <choice>
> <when>
> <simple>${body} == null || ${body} == ''</simple>
> <log message="Received message with missing body:
> ${header.CamelMessageHistory}"/>
> </when>
> <otherwise>
> </otherwise>
> </choice>
>
> <to uri="localAMQ:topic:MY_TOPIC_A"/>
> <split streaming="true" >
> <method ref="Splitter" method="processMessage"/>
> <multicast>
> <to uri="direct:routeSorter"/>
> </multicast>
> </split>
> </route>
>
> Logging was added to make sure it wasn't an upstream issue (and it's not)
>
> The data being passed is formatted as arrays of JSON. The <to
> uri="localAMQ:topic:MY_TOPIC_A"/> just passes it untouched. The Splitter send
> a copy elsewhere to be filtered by an order number prefix.
> The internal Camel to AMQ connection is via the vm:// transport using
> org.apache.camel.component.activemq.ActiveMQComponent (but I have also tried
> a pooled JMS connection factory with the same results)
> When I connect a test non durable consumer from a Ruby script using STOMP, or
> NIO I see the same issue. Some messages appear to have a 0 sized body.
> I can connect an c++ open wire consumer from the same server and that
> instance gets all messages with no 0 size bodies.
> I have tried various versions of Camel and all exhibit the same results.
> It;'s also worth noting that the data sent to the splitter function reports
> no errors either.
> I have also tried some of the older STOPM GEM packages but no change. (Though
> I have found some odd connection issue when you upgrade to io-wait-0.4.0 from
> 0.3.1
>
> After much swapping things round and testing I've finally narrowed it down to
> some issue with the vm:// transport...
> I have swapped the internal Camel connection from using vm:// to tcp:// and
> for the last 24hrs have seen no client errors with 0 sized bodies.
> I don't have any way to debug this deeper but hopefully someone else will
> pick this up.
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