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https://issues.jboss.org/browse/AS7-4862?page=com.atlassian.jira.plugin.s...
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jaikiran pai commented on AS7-4862:
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Rado, like I said, this isn't a bug. If there are multiple nodes that can handle the
same bean and if the client application expects the deployment node selection to be as per
his application requirements, then the application is expected to configure such a
deployment node selector for the initial load balancing on the beans. The EJB client API
will have no knowledge of which of the nodes to select. For now, the only available
implementation of a deployment node selector in the EJB client API is the random node
selector.
{quote}
The defaults and default implementation logic MUST be reasonable. We cannot expect users
to go on an change every default to get the product working.
{quote}
What's reasonable? Which part of the product isn't working? Like I have said in
some JIRAs and forum threads, the EJB client API identifies a EJB target by the
appname/modulename/distinctname/beanname combination. If multiple nodes can handle it,
then it uses a deployment node selector to pick one node. The only implementation of that
selector currently is the random node selector. The EJB client API cannot really come up
with a different reasonable implementation since it's the application which decides
what's reasonable. For example, how do you define a round robin implementation when
the number of nodes keep changing? Each application might deal with that differently.
{quote}
we have a test for that in the upstream testsuite but only on 2 nodes, so even the
balancing might be really broken.
{quote}
It's not broken. Which test is this? The tests that I'm aware of do not check any
round robin or other similar load balancing techniques.
{quote}
The latest job shows the distribution problem in CR1 build as well
https://hudson.qa.jboss.com/hudson/job/eap-6x-failover-ejb-ejbremote-unde...
{quote}
Why would the results be any different if the same random deployment node selector was
used?
I'm assigning this back, since this isn't broken and isn't a bug. If
there's a requirement to provide a different implementation for deployment node
selector then please create a feature request with details of the exact requirements of
that selector.
Remote EJB cluster view propagation or SFSB load balancing broken
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Key: AS7-4862
URL:
https://issues.jboss.org/browse/AS7-4862
Project: Application Server 7
Issue Type: Bug
Components: Clustering, EJB
Affects Versions: 7.1.2.Final (EAP)
Reporter: Radoslav Husar
Assignee: jaikiran pai
Fix For: 7.1.3.Final (EAP)
Looking at the load-balancing again, it seems still wrong. Checking the logs, servers
were started *and cluster was formed* ~10 seconds prior to starting the client and
load-balancing was roughly:
* node perf18: ~50% of sessions
* node perf19: 0
* node perf20: 0
* node perf21: ~50% of sessions
I let all the session to be created in one minute (not all at once).
The nodes were also specified in the properties.
{noformat}
node perf18
[JBossINF] 07:01:53,991 INFO
[org.infinispan.remoting.transport.jgroups.JGroupsTransport] (CacheService lifecycle - 1)
ISPN000094: Received new cluster view: [perf19/ejb|3] [perf19/ejb, perf21/ejb, perf20/ejb,
perf18/ejb]
node perf19
[JBossINF] 07:01:53,781 INFO
[org.infinispan.remoting.transport.jgroups.JGroupsTransport] (Incoming-19,null)
ISPN000094: Received new cluster view: [perf19/ejb|3] [perf19/ejb, perf21/ejb, perf20/ejb,
perf18/ejb]
node perf20
[JBossINF] 07:01:53,781 INFO
[org.infinispan.remoting.transport.jgroups.JGroupsTransport] (Incoming-14,null)
ISPN000094: Received new cluster view: [perf19/ejb|3] [perf19/ejb, perf21/ejb, perf20/ejb,
perf18/ejb]
node perf21
[JBossINF] 07:01:53,780 INFO
[org.infinispan.remoting.transport.jgroups.JGroupsTransport] (Incoming-12,null)
ISPN000094: Received new cluster view: [perf19/ejb|3] [perf19/ejb, perf21/ejb, perf20/ejb,
perf18/ejb]
controller node
2012/05/22 07:02:02:932 EDT [DEBUG][TestController] HOST
perf17.mw.lab.eng.bos.redhat.com:rootProcess:c - Setting thread count: 2000, was: 0
2012/05/22 07:02:53:731 EDT [DEBUG][TestController] HOST
perf17.mw.lab.eng.bos.redhat.com:rootProcess:c - All runners (2000) started in 50799
milliseconds
{noformat}
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