Artemis 2.9.0. (as well as 2.6.3 where I first was testing).
I've got a working master / backup cluster, using static connectors. My
server broker.xml has these components:
<connectors>
<connector
name="master-connector">tcp://activemqmaster:61616</connector>
<connector
name="slave-connector">tcp://activemqbackup:61616</connector>
</connectors>
<acceptors>
<acceptor
name="netty-acceptor">tcp://0.0.0.0:61616?tcpSendBufferSize=1048576;tcpReceiveBufferSize=1048576;protocols=CORE;useEpoll=true</acceptor>
</acceptors>
<ha-policy>
<shared-store>
<master>
<failover-on-shutdown>true</failover-on-shutdown>
</master>
</shared-store>
</ha-policy>
<cluster-connections>
<cluster-connection name="${bc.core.deploy.env}-cluster">
<connector-ref>master-connector</connector-ref>
<static-connectors allow-direct-connections-only="true">
<connector-ref>slave-connector</connector-ref>
</static-connectors>
</cluster-connection>
</cluster-connections>
I want to adjust the behaviour when (for example) master starts up and the
backup server isn't present. With the above, the master console just shows
exception after exception like this:
2019-07-11 15:38:45,750 ERROR [org.apache.activemq.artemis.core.client]
AMQ214016: Failed to create netty connection: java.net.UnknownHostException:
activemqbackup
activemqmaster_1 | at
java.net.InetAddress.getAllByName0(InetAddress.java:1281) [rt.jar:1.8.0_212]
every half second. (Well - twice every half second for some reason - there
seem to be two threads or something trying to connect to the backup server).
When I try to add options into the <cluster-connection>, some of them work,
some of them don't seem to work, and some cause compile errors when Artemis
starts up. For example, adding:
<retry-interval>2</retry-interval>
setting works - the retries go from every half second to every 2 seconds
(although there seem to be two threads trying to connect).
Adding:
<retry-interval-multiplier>1.5</retry-interval-multiplier>
doesn't seem to make any difference - the exceptions still come every 2
seconds.
Adding a
<initial-connect-attempts>3</initial-connect-attempts>
to try to limit the initial number of connection attempts yields an error
activemqmaster_1 | Caused by: org.xml.sax.SAXParseException;
cvc-complex-type.2.4.a: Invalid content was found starting with element
'initial-connect-attempts'. One of
'{"urn:activemq:core":use-duplicate-detection,
"urn:activemq:core":forward-when-no-consumers,
"urn:activemq:core":message-load-balancing, "urn:activemq:core":max-hops,
"urn:activemq:core":confirmation-window-size,
"urn:activemq:core":producer-window-size,
"urn:activemq:core":call-failover-timeout,
"urn:activemq:core":notification-interval,
"urn:activemq:core":notification-attempts,
"urn:activemq:core":scale-down-connector,
"urn:activemq:core":static-connectors,
"urn:activemq:core":discovery-group-ref}' is expected.
activemqmaster_1 | at
com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:203)
when I look at the artemis-configuration.xsd, the "cluster-connectionType"
has "initial-connect-attempts" defined.
<xsd:element name="initial-connect-attempts" type="xsd:int"
default="-1" maxOccurs="1" minOccurs="0">
<xsd:annotation>
<xsd:documentation>
How many attempts should be made to connect initially
</xsd:documentation>
</xsd:annotation>
</xsd:element>
What I'm trying to get to is something like this:
<cluster-connections>
<cluster-connection name="${bc.core.deploy.env}-cluster">
<connector-ref>master-connector</connector-ref>
<retry-interval>2000</retry-interval>
<retry-interval-multiplier>1.5</retry-interval-multiplier>
<max-retry-interval>120000</max-retry-interval>
<reconnect-attempts>30</reconnect-attempts>
<initial-connect-attempts>30</initial-connect-attempts>
<static-connectors allow-direct-connections-only="true">
<connector-ref>slave-connector</connector-ref>
</static-connectors>
</cluster-connection>
</cluster-connections>
Does anyone have any ideas on what I might be doing wrong?
Thanks!
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