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Posted to issues@activemq.apache.org by "Apache Dev (Jira)" <ji...@apache.org> on 2022/05/13 18:24:00 UTC
[jira] [Created] (ARTEMIS-3831) Scale-down fails when using same discovery-group used by Broker cluster connection
Apache Dev created ARTEMIS-3831:
-----------------------------------
Summary: Scale-down fails when using same discovery-group used by Broker cluster connection
Key: ARTEMIS-3831
URL: https://issues.apache.org/jira/browse/ARTEMIS-3831
Project: ActiveMQ Artemis
Issue Type: Bug
Components: Broker
Affects Versions: 2.19.1
Reporter: Apache Dev
Using 2 Live brokers in cluster.
Both having the following HA Policy:
<ha-policy>
<live-only>
<scale-down>
<enabled>true</enabled>
<discovery-group-ref discovery-group-name="activemq-discovery-group"/>
</scale-down>
</live-only>
</ha-policy>
where "activemq-discovery-group" is using JGroups TCPPING:
<discovery-groups>
<discovery-group name="activemq-discovery-group">
<jgroups-file>...</jgroups-file>
<jgroups-channel>...</jgroups-channel>
<refresh-timeout>10000</refresh-timeout>
</discovery-group>
</discovery-groups>
and it is used by the cluster of 2 brokers:
<cluster-connections>
<cluster-connection name="activemq-cluster">
<connector-ref>netty-connector</connector-ref>
<retry-interval>5000</retry-interval>
<use-duplicate-detection>true</use-duplicate-detection>
<message-load-balancing>OFF</message-load-balancing>
<max-hops>1</max-hops>
<discovery-group-ref discovery-group-name="activemq-discovery-group"/>
</cluster-connection>
</cluster-connections>
Issue is that when shutdown happens, scale-down fails:
{code}
org.apache.activemq.artemis.core.server W AMQ222181: Unable to scaleDown messages
ActiveMQInternalErrorException[errorType=INTERNAL_ERROR message=AMQ219004: Failed to initialise session factory]
at org.apache.activemq.artemis.core.client.impl.ServerLocatorImpl.initialize(ServerLocatorImpl.java:272)
at org.apache.activemq.artemis.core.client.impl.ServerLocatorImpl.createSessionFactory(ServerLocatorImpl.java:655)
at org.apache.activemq.artemis.core.client.impl.ServerLocatorImpl.connect(ServerLocatorImpl.java:554)
at org.apache.activemq.artemis.core.client.impl.ServerLocatorImpl.connect(ServerLocatorImpl.java:533)
at org.apache.activemq.artemis.core.server.LiveNodeLocator.connectToCluster(LiveNodeLocator.java:85)
at org.apache.activemq.artemis.core.server.impl.LiveOnlyActivation.connectToScaleDownTarget(LiveOnlyActivation.java:146)
at org.apache.activemq.artemis.core.server.impl.LiveOnlyActivation.freezeConnections(LiveOnlyActivation.java:114)
at org.apache.activemq.artemis.core.server.impl.ActiveMQServerImpl.freezeConnections(ActiveMQServerImpl.java:1468)
at org.apache.activemq.artemis.core.server.impl.ActiveMQServerImpl.stop(ActiveMQServerImpl.java:1250)
at org.apache.activemq.artemis.core.server.impl.ActiveMQServerImpl.stop(ActiveMQServerImpl.java:1166)
at org.apache.activemq.artemis.core.server.impl.ActiveMQServerImpl.stop(ActiveMQServerImpl.java:1150)
...
Caused by: ActiveMQInternalErrorException[errorType=INTERNAL_ERROR message=channel is closed]
at org.apache.activemq.artemis.core.client.impl.ServerLocatorImpl.startDiscovery(ServerLocatorImpl.java:286)
at org.apache.activemq.artemis.core.client.impl.ServerLocatorImpl.initialize(ServerLocatorImpl.java:268)
... 44 more
Caused by: java.lang.IllegalStateException: channel is closed
at org.jgroups.JChannel.checkClosed(JChannel.java:957)
at org.jgroups.JChannel._preConnect(JChannel.java:548)
at org.jgroups.JChannel.connect(JChannel.java:288)
at org.jgroups.JChannel.connect(JChannel.java:279)
at org.apache.activemq.artemis.api.core.jgroups.JChannelWrapper.connect(JChannelWrapper.java:126)
at org.apache.activemq.artemis.api.core.JGroupsBroadcastEndpoint.internalOpen(JGroupsBroadcastEndpoint.java:113)
at org.apache.activemq.artemis.api.core.JGroupsBroadcastEndpoint.openClient(JGroupsBroadcastEndpoint.java:91)
at org.apache.activemq.artemis.core.cluster.DiscoveryGroup.start(DiscoveryGroup.java:111)
at org.apache.activemq.artemis.core.client.impl.ServerLocatorImpl.startDiscovery(ServerLocatorImpl.java:284)
... 45 more
{code}
JGroups channel used by scale-down is probably the same used by broker, but already being closed during broker shutdown itself.
As a workaround, it is possible to create a separate discovery-group (with its own broadcast-group) so that scale-down uses a new JGroups channel not being closed by broker.
However, this causes duplication of configurations and a new JGroups port for the scale-down discovery must be opened.
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