Looking up a distributed queue with two persistent stores using two JMS Svr
I am trying to do the following:
1. Setup a distributed queue, i have two servers which are part of the cluster:
Server A: t3://localhost:7003
Server B: t3://localhost:7005
I go in and create two jms servers:
JMS Server JA: Target on Server A
JMS Server JB: Target on Server B
Now as the jms servers need to use a seperate persistent store for each one of them i create two persistent stores.
2. Now from my MDB which is deployed on another server i lookup the queue using
t3://localhost:7003,localhost:7005 as the provider url
My problem is that i always end up listening to the messages on the first jms server and never get to read the messages on jms server JB as i guess i am able to connect to JMS Server JA so i never try and connect to JB? What to do about this?
Edited by: user4828945 on Mar 23, 2009 2:32 PM
Allocation of consumers wouldn't take into account the number of messages on the queue - they'd be allocated randomly. The scenario you're proposing shouldn't happen though - WebLogic Server takes into account whether a member has consumers when sending to a distributed destination, but otherwise, assuming that Queue 1 and Queue 2 both have consumers, then distribution of load will be equal. It's not the amount of consumers that determine how many messages get sent to a distributed destination member - it's whether it has members at all.
Assuming that did occur initially though, you'd expect processing to be a little bit more intensive on the server with the queue holding 30 messages. It would pretty quickly even up though.
From that point forward, it would be somewhere between difficult and impossible to get to the second scenario, where you have an unequal number of messages in each distributed destination member, unless the work being sent with each message to an MDB can vary significantly in how long it would take to process.
Assuming (and it's a big if) you could get to that scenario, then the MDBs wouldn't switch over - they stay connected to a particular distributed destination member. And it's their connection to a member as a consumer that controls how WebLogic Server load balances messages (assuming default configuration) so that's part of what makes it unlikely to get there.
From going back to first principles in the documentation, it seems like your best result would actually be from deploying the MDB to the cluster - that way, there's no remote connections to JMS queues, and you get a pool of MDBs on each server instance.
Ref here: http://e-docs.bea.com/wls/docs81/ejb/message_beans.html
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According to the JMS documentation, I should be able to get the
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I noticed the load balancing happens when a JMS client is stopped and
restarted (meaning totally
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Any hints and ideas would greatly appreciated.
Here is the content of config.xml:
========================================================================
<?xml version="1.0" encoding="UTF-8"?>
<Domain ConfigurationVersion="8.1.0.0" Name="odh">
<Cluster ClusterAddress="localhost:8001,localhost:9001"
MulticastAddress="237.0.0.1" Name="odhCluster_1"/>
<Server ListenAddress="" ListenPort="7001" Machine="localhost"
Name="odhAdmin" NativeIOEnabled="true" ServerVersion="8.1.2.0">
<SSL Enabled="false" HostnameVerificationIgnored="false"
IdentityAndTrustLocations="KeyStores" Name="odhAdmin"/>
</Server>
<Server Cluster="odhCluster_1" ExpectedToRun="false"
IIOPEnabled="false" ListenAddress="" ListenPort="8001"
Machine="localhost" Name="odhManagedServer_1"
NativeIOEnabled="true" ServerVersion="8.1.2.0">
<SSL Enabled="false" IdentityAndTrustLocations="KeyStores"
Name="odhManagedServer_1"/>
<ExecuteQueue Name="weblogic.kernel.Default" ThreadCount="15"/>
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<SSL Enabled="false" IdentityAndTrustLocations="KeyStores"
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<ExecuteQueue Name="weblogic.kernel.Default" ThreadCount="15"/>
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server. Do not delete manually."
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Name="odhManagedServer_2 (migratable)"
Notes="This is a system generated default migratable target for a
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Name="DistributedQueueMember_1"/>
<JMSDistributedQueueMember JMSQueue="odhQueue_2"
Name="DistributedQueueMember_2"/>
</JMSDistributedQueue>
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Name="odhJMSJDBCStore_1" PrefixName="Order1_"/>
<JMSJDBCStore ConnectionPool="odhMessagePool"
Name="odhJMSJDBCStore_2" PrefixName="Order2_"/>
<JMSServer Name="odhJMSServer_1" Store="odhJMSJDBCStore_1"
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JNDIName="com.neoforma.odhQueue_2" Name="odhQueue_2"
StoreEnabled="true"/>
</JMSServer>
<JDBCConnectionPool
DriverName="oracle.jdbc.xa.client.OracleXADataSource"
Name="odhConnectionPool" Password="...."
Properties="user=..." Targets="odhCluster_1"
TestTableName="SQL SELECT 1 FROM DUAL" URL="................."/>
<JDBCConnectionPool DriverName="oracle.jdbc.driver.OracleDriver"
Name="odhMessagePool" Password="....."
Properties="user=....." Targets="odhCluster_1"
TestTableName="SQL SELECT 1 FROM DUAL" URL="............."/>
<JDBCMultiPool AlgorithmType="High-Availability"
Name="odhJDBCMultiPool_1"
PoolList="odhConnectionPool,odhMessagePool"
Targets="odhCluster_1"/>
<JDBCTxDataSource EnableTwoPhaseCommit="false"
JNDIName="com.neoforma.order.orderDS" Name="odhJDBCDataSource_1"
PoolName="odhConnectionPool" Targets="odhCluster_1"/>
<Security Name="odh" PasswordPolicy="wl_default_password_policy"
Realm="wl_default_realm" RealmSetup="true"/>
<!--
<EmbeddedLDAP
Credential="{3DES}j+xkS9y1EYJUfic+M9ZJ+5DqGjiwTaVnt+Ti0TQWxXg="
Name="odh"/>
<SecurityConfiguration
Credential="{3DES}OiyDMEOJS4gPLumKeKYWC+Kj9xWib6MhbmrNjeBmjJ7bpJypNb6Z7bUtAQF/bvi2RrFMs+3kqKerWNyD3NyT3QsrsyPoBDT0"
Name="odh" RealmBootStrapVersion="1"/>
-->
<Realm FileRealm="wl_default_file_realm" Name="wl_default_realm"/>
<FileRealm Name="wl_default_file_realm"/>
<PasswordPolicy Name="wl_default_password_policy"/>
<Application Deployed="true" Name="odh.ear"
Path="D:\bea\user_projects\domains\odh\applications\odh.ear"
StagedTargets="odhManagedServer_1,odhManagedServer_2"
StagingMode="stage" TwoPhase="true">
<EJBComponent Name="odh.jar" Targets="odhCluster_1" URI="odh.jar"/>
</Application>
<StartupClass ClassName="com.neoforma.startup.JMXMBeanStartup"
DeploymentOrder="1" Name="ODH MBean Startup Class"
Notes="ODH MBean Startup Class - Note" Targets="odhAdmin"/>
<EmbeddedLDAP
Credential="{3DES}YFY55/dsdxI9HL/AKGRXHuR1VwyJewNFdAHdrtk/WMM="
Name="odh"/>
<SecurityConfiguration
Credential="{3DES}ZCPa1Bsrj3z2DhVKVUbq32zTYipDVff+LDB9+1b2Dr4VLhz5yjZyHgPheqS/kum4VVZamDYN07Hyb6rALiCTHhwt1EzK5+M+"
Name="odh" RealmBootStrapVersion="1"/>
</Domain>
Thanks for the Makiey. I am surprise that BEA hasn't come back with any
info.
Hien
On 7 Jul 2004 01:51:01 -0700, makiey <[email protected]> wrote:
>
> Hi Hien Luu,
>
> We also have a problem with load balancing, tested with WLS 7.0 SP4 and
> WLS 8.1
> SP2 (HP UX). The only "working" configuration is load-balancing policy =
> random
> (CF deployed to cluster, load balancing enabled, affinity disabled).
> With the
> "round-robin" policy we cannot utilize more than 50% dis. queue's
> members.
>
> I'm trying to prepare a reproducer...
>
> greetings,
> makiey
>
>
> "Hien Luu" <[email protected]> wrote:
>> Hi,
>>
>> According to the JMS documentation, I should be able to get the =
>>
>> distributed queue to load balance
>> between each time the message producer calls Message.send(). I was not
>> =
>> =
>>
>> able to achieve this, however,
>> I noticed the load balancing happens when a JMS client is stopped and
>> =
>>
>> restarted (meaning totally
>> exit the JVM and restart the JVM).
>>
>> Here is my configuration:
>>
>> WLS 8.1 SP2 on XP
>> One cluster with two nodes (running on the same machine w/ different
>> por=
>> t)
>> Each node hosts one JMS server, which hosts one physical queue and
>> using=
>> =
>>
>> JDBC store
>> One distributed queue with two physical members from each of the JMS
>> =
>>
>> server.
>> JMS Connection Factory is configured with "Load Balancing Enabled" set
>> t=
>> o =
>>
>> yes,
>> and "Server Affinity Enabled" to no. This connection factory is target
>> =
>> to =
>>
>> the cluster.
>>
>> The queue session for the queue sender is created with transaction
>> setti=
>> ng =
>>
>> to false.
>>
>> Any hints and ideas would greatly appreciated.
>>
>>
>> Here is the content of config.xml:
>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
>>
>> <?xml version=3D"1.0" encoding=3D"UTF-8"?>
>> <Domain ConfigurationVersion=3D"8.1.0.0" Name=3D"odh">
>> <Cluster ClusterAddress=3D"localhost:8001,localhost:9001"
>> MulticastAddress=3D"237.0.0.1" Name=3D"odhCluster_1"/>
>> <Server ListenAddress=3D"" ListenPort=3D"7001" Machine=3D"localhost=
>> "
>> Name=3D"odhAdmin" NativeIOEnabled=3D"true" ServerVersion=3D"8.1=
>> .2.0">
>> <SSL Enabled=3D"false" HostnameVerificationIgnored=3D"false"
>> IdentityAndTrustLocations=3D"KeyStores" Name=3D"odhAdmin"/>=
>>
>> </Server>
>> <Server Cluster=3D"odhCluster_1" ExpectedToRun=3D"false"
>> IIOPEnabled=3D"false" ListenAddress=3D"" ListenPort=3D"8001"
>> Machine=3D"localhost" Name=3D"odhManagedServer_1"
>> NativeIOEnabled=3D"true" ServerVersion=3D"8.1.2.0">
>> <SSL Enabled=3D"false" IdentityAndTrustLocations=3D"KeyStores"
>> =
>> =
>>
>> Name=3D"odhManagedServer_1"/>
>> <ExecuteQueue Name=3D"weblogic.kernel.Default" ThreadCount=3D"1=
>> 5"/>
>> </Server>
>> <Server Cluster=3D"odhCluster_1" ExpectedToRun=3D"false"
>> IIOPEnabled=3D"false" ListenAddress=3D"" ListenPort=3D"9001"
>> Machine=3D"localhost" Name=3D"odhManagedServer_2"
>> NativeIOEnabled=3D"true" ServerVersion=3D"8.1.2.0">
>> <SSL Enabled=3D"false" IdentityAndTrustLocations=3D"KeyStores"
>> =
>> =
>>
>> Name=3D"odhManagedServer_2"/>
>> <ExecuteQueue Name=3D"weblogic.kernel.Default" ThreadCount=3D"1=
>> 5"/>
>> </Server>
>> <MigratableTarget Cluster=3D"odhCluster_1"
>> Name=3D"odhManagedServer_1 (migratable)"
>> Notes=3D"This is a system generated default migratable target
>> f=
>> or a =
>>
>> server. Do not delete manually."
>> UserPreferredServer=3D"odhManagedServer_1"/>
>> <MigratableTarget Cluster=3D"odhCluster_1"
>> Name=3D"odhManagedServer_2 (migratable)"
>> Notes=3D"This is a system generated default migratable target
>> f=
>> or a =
>>
>> server. Do not delete manually."
>> UserPreferredServer=3D"odhManagedServer_2"/>
>> <Machine Name=3D"localhost">
>> <NodeManager ListenAddress=3D"localhost" Name=3D"localhost"/>
>> </Machine>
>> <JMSConnectionFactory AcknowledgePolicy=3D"All"
>> DefaultDeliveryMode=3D"Persistent"
>> JNDIName=3D"com.neoforma.ConnectionFactory"
>> Name=3D"odhConnectionFactory" ServerAffinityEnabled=3D"false"
>> Targets=3D"odhCluster_1" XAConnectionFactoryEnabled=3D"true"/>
>> <JMSDistributedQueue JNDIName=3D"com.neoforma.odhDistributedQueue_1=
>> "
>> LoadBalancingPolicy=3D"Round-Robin" Name=3D"odhDistributedQueue=
>> _1" =
>>
>> Targets=3D"odhCluster_1">
>> <JMSDistributedQueueMember JMSQueue=3D"odhQueue_1" =
>>
>> Name=3D"DistributedQueueMember_1"/>
>> <JMSDistributedQueueMember JMSQueue=3D"odhQueue_2" =
>>
>> Name=3D"DistributedQueueMember_2"/>
>> </JMSDistributedQueue>
>> <JMSJDBCStore ConnectionPool=3D"odhMessagePool"
>> Name=3D"odhJMSJDBCStore_1" PrefixName=3D"Order1_"/>
>> <JMSJDBCStore ConnectionPool=3D"odhMessagePool"
>> Name=3D"odhJMSJDBCStore_2" PrefixName=3D"Order2_"/>
>> <JMSServer Name=3D"odhJMSServer_1" Store=3D"odhJMSJDBCStore_1"
>> =
>>
>> Targets=3D"odhManagedServer_1">
>> <JMSQueue CreationTime=3D"1076439896999"
>> JNDIName=3D"com.neoforma.odhQueue_1" Name=3D"odhQueue_1"
>> =
>>
>> StoreEnabled=3D"true"/>
>> </JMSServer>
>> <JMSServer Name=3D"odhJMSServer_2" Store=3D"odhJMSJDBCStore_2"
>> =
>>
>> Targets=3D"odhManagedServer_2">
>> <JMSQueue CreationTime=3D"1076439664343"
>> JNDIName=3D"com.neoforma.odhQueue_2" Name=3D"odhQueue_2"
>> =
>>
>> StoreEnabled=3D"true"/>
>> </JMSServer>
>> <JDBCConnectionPool
>> DriverName=3D"oracle.jdbc.xa.client.OracleXADataSource"
>> Name=3D"odhConnectionPool" Password=3D"...."
>> Properties=3D"user=3D..." Targets=3D"odhCluster_1"
>> TestTableName=3D"SQL SELECT 1 FROM DUAL" URL=3D"...............=
>> .."/>
>> <JDBCConnectionPool DriverName=3D"oracle.jdbc.driver.OracleDriver"
>> Name=3D"odhMessagePool" Password=3D"....."
>> Properties=3D"user=3D....." Targets=3D"odhCluster_1"
>> TestTableName=3D"SQL SELECT 1 FROM DUAL" URL=3D"............."/=
>>>
>> <JDBCMultiPool AlgorithmType=3D"High-Availability"
>> Name=3D"odhJDBCMultiPool_1"
>> PoolList=3D"odhConnectionPool,odhMessagePool" =
>>
>> Targets=3D"odhCluster_1"/>
>> <JDBCTxDataSource EnableTwoPhaseCommit=3D"false"
>> JNDIName=3D"com.neoforma.order.orderDS" Name=3D"odhJDBCDataSour=
>> ce_1"
>> PoolName=3D"odhConnectionPool" Targets=3D"odhCluster_1"/>
>> <Security Name=3D"odh" PasswordPolicy=3D"wl_default_password_policy=
>> "
>> Realm=3D"wl_default_realm" RealmSetup=3D"true"/>
>> <!--
>> <EmbeddedLDAP
>> Credential=3D"{3DES}j+xkS9y1EYJUfic+M9ZJ+5DqGjiwTaVnt+Ti0TQWxXg=
>> =3D" =
>>
>> Name=3D"odh"/>
>> <SecurityConfiguration
>> Credential=3D"{3DES}OiyDMEOJS4gPLumKeKYWC+Kj9xWib6MhbmrNjeBmjJ7=
>> bpJypNb6Z7bUtAQF/bvi2RrFMs+3kqKerWNyD3NyT3QsrsyPoBDT0"
>> Name=3D"odh" RealmBootStrapVersion=3D"1"/>
>> -->
>> <Realm FileRealm=3D"wl_default_file_realm" Name=3D"wl_default_realm=
>> "/>
>> <FileRealm Name=3D"wl_default_file_realm"/>
>> <PasswordPolicy Name=3D"wl_default_password_policy"/>
>> <Application Deployed=3D"true" Name=3D"odh.ear"
>> Path=3D"D:\bea\user_projects\domains\odh\applications\odh.ear"
>> StagedTargets=3D"odhManagedServer_1,odhManagedServer_2"
>> StagingMode=3D"stage" TwoPhase=3D"true">
>> <EJBComponent Name=3D"odh.jar" Targets=3D"odhCluster_1" URI=3D"=
>> odh.jar"/>
>> </Application>
>> <StartupClass ClassName=3D"com.neoforma.startup.JMXMBeanStartup"
>> DeploymentOrder=3D"1" Name=3D"ODH MBean Startup Class"
>> Notes=3D"ODH MBean Startup Class - Note" Targets=3D"odhAdmin"/>=
>>
>> <EmbeddedLDAP
>> Credential=3D"{3DES}YFY55/dsdxI9HL/AKGRXHuR1VwyJewNFdAHdrtk/WMM=
>> =3D" =
>>
>> Name=3D"odh"/>
>> <SecurityConfiguration
>> Credential=3D"{3DES}ZCPa1Bsrj3z2DhVKVUbq32zTYipDVff+LDB9+1b2Dr4=
>> VLhz5yjZyHgPheqS/kum4VVZamDYN07Hyb6rALiCTHhwt1EzK5+M+"
>> Name=3D"odh" RealmBootStrapVersion=3D"1"/>
>> </Domain>
>
Using Opera's revolutionary e-mail client: http://www.opera.com/m2/
-
WebLogic 12.1.2 erases subdeployment on Distributed Queue when targeted to multiple JMS Servers
Update: verified in a 12.1.1.0 (JDK6) cluster - bug does not occur there.
Hi,
I have been migrating an 10.3.5.0 server to WebLogic 12.1.2.0 and have been unable to keep the subdeployment dropdown populated in the subdeployment tab of a uniform distributed queue when the subdeployment targets more than 1 JMS Server.
If I uncheck one of the servers - I work fine - however I would like to target all JMS Servers in the cluster - this used to work fine in 10.3.5.0
Following
http://docs.oracle.com/cd/E24329_01/apirefs.1211/e24401/taskhelp/jms_modules/distributed_queues/CreateUniformDistributedQueues.html
I am able to create a new queue no problem against the multiple-server subdeployment - but when I navigate to the subdeployment dropdown - the target is erased with "None".
If I save the subdeployment after setting it during the queue create - it is erased
<sub-deployment-name>MW-JMS-SubDeployment</sub-deployment-name>
Before:
<weblogic-jms xmlns="http://xmlns.oracle.com/weblogic/weblogic-jms" xmlns:sec="http://xmlns.oracle.com/weblogic/security" xmlns:wls="http://xmlns.oracle.com/weblogic/security/wls" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.oracle.com/weblogic/weblogic-jms http://xmlns.oracle.com/weblogic/weblogic-jms/1.1/weblogic-jms.xsd">
<uniform-distributed-queue name="HousekeeperControlQueue">
<sub-deployment-name>MW-JMS-SubDeployment</sub-deployment-name>
<jndi-name>jms/HousekeeperControlQueue</jndi-name>
</uniform-distributed-queue>
</weblogic-jms>
After:
<weblogic-jms xmlns="http://xmlns.oracle.com/weblogic/weblogic-jms" xmlns:sec="http://xmlns.oracle.com/weblogic/security" xmlns:wls="http://xmlns.oracle.com/weblogic/security/wls" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.oracle.com/weblogic/weblogic-jms http://xmlns.oracle.com/weblogic/weblogic-jms/1.1/weblogic-jms.xsd">
<uniform-distributed-queue name="HousekeeperControlQueue">
<jndi-name>jms/HousekeeperControlQueue</jndi-name>
</uniform-distributed-queue>
</weblogic-jms>
Workaround:
- upon server startup the config is valid - just dont re-save the jms module or the subdeployment target will be erases
- also when creating a new subdeployment you will be able to select it from a jms distributed queue in the advanced targeting section even if it contains expected multiple JMS servers
- you will not however be able to edit the JMS queue once created - if there is any change to targeting - recreating the queue is required
thank you
/michaelUpdate: verified in a 12.1.1.0 (JDK6) cluster - bug does not occur there.
Hi,
I have been migrating an 10.3.5.0 server to WebLogic 12.1.2.0 and have been unable to keep the subdeployment dropdown populated in the subdeployment tab of a uniform distributed queue when the subdeployment targets more than 1 JMS Server.
If I uncheck one of the servers - I work fine - however I would like to target all JMS Servers in the cluster - this used to work fine in 10.3.5.0
Following
http://docs.oracle.com/cd/E24329_01/apirefs.1211/e24401/taskhelp/jms_modules/distributed_queues/CreateUniformDistributedQueues.html
I am able to create a new queue no problem against the multiple-server subdeployment - but when I navigate to the subdeployment dropdown - the target is erased with "None".
If I save the subdeployment after setting it during the queue create - it is erased
<sub-deployment-name>MW-JMS-SubDeployment</sub-deployment-name>
Before:
<weblogic-jms xmlns="http://xmlns.oracle.com/weblogic/weblogic-jms" xmlns:sec="http://xmlns.oracle.com/weblogic/security" xmlns:wls="http://xmlns.oracle.com/weblogic/security/wls" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.oracle.com/weblogic/weblogic-jms http://xmlns.oracle.com/weblogic/weblogic-jms/1.1/weblogic-jms.xsd">
<uniform-distributed-queue name="HousekeeperControlQueue">
<sub-deployment-name>MW-JMS-SubDeployment</sub-deployment-name>
<jndi-name>jms/HousekeeperControlQueue</jndi-name>
</uniform-distributed-queue>
</weblogic-jms>
After:
<weblogic-jms xmlns="http://xmlns.oracle.com/weblogic/weblogic-jms" xmlns:sec="http://xmlns.oracle.com/weblogic/security" xmlns:wls="http://xmlns.oracle.com/weblogic/security/wls" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.oracle.com/weblogic/weblogic-jms http://xmlns.oracle.com/weblogic/weblogic-jms/1.1/weblogic-jms.xsd">
<uniform-distributed-queue name="HousekeeperControlQueue">
<jndi-name>jms/HousekeeperControlQueue</jndi-name>
</uniform-distributed-queue>
</weblogic-jms>
Workaround:
- upon server startup the config is valid - just dont re-save the jms module or the subdeployment target will be erases
- also when creating a new subdeployment you will be able to select it from a jms distributed queue in the advanced targeting section even if it contains expected multiple JMS servers
- you will not however be able to edit the JMS queue once created - if there is any change to targeting - recreating the queue is required
thank you
/michael -
Cannot retrieve data in all members of my distributed queue
I have a distributed queue with 3 members, queue member 1, queue member 2, and queue member 3.
I triggered 2 events separately to go to the distributed queue, and it was successful as the 1st event triggered went to queue member 1 (physical queue1 – located on server 1) and the next event sent on the next trigger went to queue member 2 (physical queue 2 – located on server 2).
The problem now is, after triggering a job that gets the event from distributed queue, only the event in queue member 1 was picked up. The job got completed without picking up the event in queue member 2 (different VM). The data in queue member 2 was left. The config file for the JMS Queue Connectivity may be seen below:
jms.url=t3://<MS1_IP>:<MS1_PORT>,<MS2_IP>:<MS2_PORT>,<MS3_IP>:<MS3_PORT>
jms.connfactory=ConnFactoryName
jms.timeout=30000
jms.queue=DistributedQueueName
Note also that the connection factory is deployed to all managed servers as I could see the connection factory in the jndi tree of each managed server.
Our job was able to get data from each of the managed server, one by one. An example I tried is I placed an event in queue member 1 then triggered the job, then the data was picked up. Then next, I placed the data in queue member 2 (with no other data in queue member 1 and 3), then the data in queue member 2 was picked up after the job run, and same when placed only in queue member 3.
The main problem here is when there are data in all of the physical queues (queue member 1 to 3). As if the application is focused only to one physical queue, which shouldn’t be. Researching now how should it read all the members in the distributed queue.Hi,
A comma separated URL list helps a client setup its initial JNDI connection into the cluster - it doesn't directly control load balancing of future JEE EJB, RMI, or JMS calls. By default, for remote clients, JEE calls will automatically load balance a new direct connection randomly among all servers in the cluster, even if the initial JNDI URL only references a single server's address. It's actually not truly random, as there may be internal heuristics that effect the load balance decision, plus the behavior is actually tunable, but, for almost all use cases, its best to stay with the default behavior and think of it as effectively random.
WebLogic JMS load-balancing actually occurs at three layers: URL/DNS, "smart stub" connection creation (RMI, EJB, and JMS connection factory), and finally the distributed destination layers. For a full end-to-end explanation of load balancing at the different layers of the WL stack, I highly recommend the JMS chapter of the book "Professional Oracle WebLogic".
What's happening in your case is that JMS individual consumer always load balances to one particular queue member, and then sticks to that queue member for their lifetime. This is expected behavior for consumer load balancing, and is fully documented in the distributed destination documention of the JMS programmer's guide.
If you want to ensure full coverage of a distributed queue, in order of highest to lowest preference:
* Most highly recommend: Use a WL MDB or a 11gR1PS3 SOA Adapter (if you happen to be using Oracle's SOA layered product). These automatically ensure that all distributed queue members are serviced by at least one dedicated consumer.
* Ensure you have more sessions+consumers than queue members. Periodically refresh connections/sessions/consumers in order to ensure that newly started members are serviced even when all consumers are already connected (eg, code your clients to reconnect every few minutes).
* If your application is not performance sensitive, configure the "queue forward delay" setting on a distributed queue. Messages that are trapped on a queue member with no consumers for longer than this delay will be automatically forwarded a member that has consumers.
* Least recommended, very advanced usage only: Code clients to use the new 10.3.4 public "destination availability" extensions. These extension APIs provide a notification service for distributed destination member up/down events.
Regards,
Tom -
JMS Server on a cluster stores all msgs posted to Distributed Queue on 1 server failure
Hi
I have a Cluster setup with 2 managed servers srvr1 & srvr2 each running its own
JMS server.
Product version in use is Weblogic SP2.
Configured a Distributed Queue and deployed it on both the JMS servers.
Set the load-balancing to round-Robin and Server-Affinity to False on the connection
factory.
The producer is an external client which posts 100 messages to the Distributed
queue.
Consumers are MDBs pinned to the respective physical queues on the respective
JMS servers.
Each server has its own store.
Once 100 messages are posted to the Distributed Queue. The messages are distributed
to
the 2 Physical Destinations equally i.e 50-50 each.
While the MDBs are processing the msgs, server srvr1 is brought down at a point
when it has consumed only 10 of its 50 msgs.
When the srvr1 is brought up again, i am finding that the store for that JMS server
contains the 40 unprocessed msgs in its physical queue + the msgs on the other
queue that were unprocessed at the time this server crashed.
When srvr1 went down, srvr2 was running and it went on to process all its 50 msgs
completly. Why would those processed msgs show up again when srvr1 is brought
up ?
Please provide some input !!
Ravi.
The log message is from the distributed destination
"forwarders". In distributed queues, these forwarders
automatically move messages from queues without
consumers to queues that have them (queue
forwarders are disabled by default). In distributed topics,
the forwarders serve
to replicate a published message from the local
topic member to each of the remote topic members.
"Raviprasad Athivilli" <[email protected]> wrote:
>
>Tom
>
>I think you are right. When the server1 is brought up again, its picking
>up all
>the messages
>that were written to the store.
>
>But as it starts processing them, i get this exception on the server2
>that has
>been running from the beginning.
>
><Oct 10, 2003 6:20:19 PM EDT> <Error> <JMS> <040366> <JMS Distributed
>Destination
>member "MyQueue@JMSServer-02" in "MyQueue"
>unable to accept connection from remote member "MyQueue@JMSServer-01"
>due to exception
>weblogic.jms.common.JMSException: can't find
>queue target jndi table for MyQueue@JMSServer-01 != MyQueue
>weblogic.jms.common.JMSException: can't find queue target jndi table
>for MyQueue@JMSServer-01
>!= MyQueue
> at weblogic.jms.backend.BEDestination.setupSystemSubscription(BEDestination.java:3466)
> at weblogic.jms.backend.BEManager.sessionAndTopicSubscriberCreate(BEManager.java:234)
> at weblogic.jms.backend.BEManager.invoke(BEManager.java:384)
> at weblogic.jms.dispatcher.Request.wrappedFiniteStateMachine(Request.java:602)
> at weblogic.jms.dispatcher.DispatcherImpl.dispatchAsync(DispatcherImpl.java:152)
> at weblogic.jms.dispatcher.DispatcherImpl.dispatchAsyncFuture(DispatcherImpl.java:396)
> at weblogic.jms.dispatcher.DispatcherImpl_WLSkel.invoke(Unknown
>Source)
> at weblogic.rmi.internal.BasicServerRef.invoke(BasicServerRef.java:362)
> at weblogic.rmi.internal.BasicServerRef$1.run(BasicServerRef.java:313)
> at weblogic.security.service.SecurityServiceManager.runAs(SecurityServiceManager.java:821)
> at weblogic.rmi.internal.BasicServerRef.handleRequest(BasicServerRef.java:308)
> at weblogic.rmi.internal.BasicExecuteRequest.execute(BasicExecuteRequest.java:30)
> at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:213)
> at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:189)
>
>What does this mean ?
>
>Ravi.
>Tom Barnes <[email protected]> wrote:
>>Seems more than odd. Are you sure that q1 got unprocessed
>>messages from q2? How did you confirm?
>>
>>Perhaps q1 got messages its MDB already processed back again -
>>an indication that the MDB is throwing Runtime exceptions
>>or Errors, and the container is rolling back transactions.
>>
>>Raviprasad Athivilli wrote:
>>> Hi
>>>
>>> I have a Cluster setup with 2 managed servers srvr1 & srvr2 each running
>>its own
>>> JMS server.
>>> Product version in use is Weblogic SP2.
>>> Configured a Distributed Queue and deployed it on both the JMS servers.
>>> Set the load-balancing to round-Robin and Server-Affinity to False
>>on the connection
>>> factory.
>>>
>>> The producer is an external client which posts 100 messages to the
>>Distributed
>>> queue.
>>> Consumers are MDBs pinned to the respective physical queues on the
>>respective
>>> JMS servers.
>>> Each server has its own store.
>>>
>>> Once 100 messages are posted to the Distributed Queue. The messages
>>are distributed
>>> to
>>> the 2 Physical Destinations equally i.e 50-50 each.
>>>
>>> While the MDBs are processing the msgs, server srvr1 is brought down
>>at a point
>>> when it has consumed only 10 of its 50 msgs.
>>>
>>> When the srvr1 is brought up again, i am finding that the store for
>>that JMS server
>>> contains the 40 unprocessed msgs in its physical queue + the msgs
>on
>>the other
>>> queue that were unprocessed at the time this server crashed.
>>>
>>> When srvr1 went down, srvr2 was running and it went on to process
>all
>>its 50 msgs
>>> completly. Why would those processed msgs show up again when srvr1
>>is brought
>>> up ?
>>>
>>> Please provide some input !!
>>>
>>> Ravi.
>>
>
-
Error in Distributed transactions with tx data source
Hi, I need to write into two DB2 databases using two container managed entity beans
from a container managed session bean. I use a JDBC 3.0 compatible JDBC driver
and I have configured tx data source. When I run the session bean it gives me
following exception.
java.rmi.RemoteException: EJB Exception: ; nested exception is: javax.ejb.EJBException:
EJB Exception:; nested exception is: java.sql.SQLException: Connection has already
been created in this tx context for pool named DB2ConnectionPool2. Illegal attempt
to create connection from another pool: DB2ConnectionPool1
thank you Lahiru
For a connection pool with xa-drivers, create a tx datasource and select 'Honor
Global Transactions'. For a connection pool with non-xa drivers, create a tx datasource,
select 'Honor Global transactions', and select 'Enable Two-phase commit'.
"Lahiru Karunatilake" <[email protected]> wrote:
>
>Hi, I need to write into two DB2 databases using two container managed
>entity beans
>from a container managed session bean. I use a JDBC 3.0 compatible JDBC
>driver
>and I have configured tx data source. When I run the session bean it
>gives me
>following exception.
>
>java.rmi.RemoteException: EJB Exception: ; nested exception is: javax.ejb.EJBException:
>EJB Exception:; nested exception is: java.sql.SQLException: Connection
>has already
>been created in this tx context for pool named DB2ConnectionPool2. Illegal
>attempt
>to create connection from another pool: DB2ConnectionPool1
>
>thank you Lahiru
>
-
Removal of messages from persisted store
Hi,
If I'm using a JDBC store for my JMS server, are the messages removed from the
DB when they are acknowledged? Are there config settings which play into this?
Thanks,
Bob
Elias Sinderson wrote:
> Tom Barnes wrote:
>
>> An acknowledge deletes the associated
>> messages from the store, whether
>> it is a JDBC store or a file store. There is no config
>> setting to turn off this behavior - and you are the first
>> customer to ever ask if there was such a beast.
>
>
> Actually, I looked for such a configuration but have been put in the
> position of archiving JMS messages myself as this option is not provided
> out of the box...
Ah. Yes, I understand this use case. We are keeping it in mind
for the future. The future solution may involve simply sending
a duplicate message to another destination in the same
transaction. The adminstrative interface might simply
be something like an "ArchiveDestination" parameter on the
original destination's configuration. Would that be sufficient?
>
> There are a number of reasons one may want to do wuch a thing, ranging
> from record retention to simply allowing an end user to browse through
> the set of delivered messages.
I agree.
> Personally, I believe that it is a
> shortcoming of the JMS specification that it does not address this issue.
Well pub/sub can address this issue. The drawback is that a durable
subscriber is not the same as a queue - only one consumer can use
it a time.
>
> The long and the short of it, in my case, is that I've now reimplemented
> a good portion of the JMS specification on top of BEAs implementation.
With WL, you can use standard JMS pub/sub to replicate messages
and then use a messaging bridge to forward a subscription to a queue.
This, of course, does not give great performance, but many applications
are not sensitive to JMS performance.
Another approach is to have senders send two messages, one to a
pub/sub "monitoring" topic and one to the queue. Optionally
using a transaction to ensure that it is atomic. Again, this is
not a great performer.
>
>
> Elias
>
Tom, BEA
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