Jan Kašík created WFLY-9913:
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Summary: Balancer fails to balance requests according to load provided by
custom load metric
Key: WFLY-9913
URL:
https://issues.jboss.org/browse/WFLY-9913
Project: WildFly
Issue Type: Bug
Components: mod_cluster, Web (Undertow)
Affects Versions: 12.0.0.Beta1
Reporter: Jan Kašík
Assignee: Radoslav Husar
When balancer uses load provided by custom load metric, it intermittently fails to
redirect requests to expected workers. We use following scenario in our test:
# Prepare one balancer and three workers with custom load metric which has these attribute
values:
{{history: 0, decay: 0, capacity: 1000}} and uses implementation from \[1\].
# The implementation takes dummy load values from files in local filesystem. So the values
in files are set then.
# The verification, that expected load factor is loaded is made by running
{{"/subsystem=undertow/configuration=filter/mod-cluster=modcluster:read-resource(include-runtime=true,
recursive=true, recursive-depth=100)}}.
# 1000+ requests is made on balancer and for each request, the JVM route of handling node
is noted.
# It is verified, that expected amount of request went to each node according to load
factor.
# Load values in files are changes and varification, that they were loaded is made again.
# 1000+ requests is made on balancer and for each request, the JVM route of handling node
is noted.
# After the requests were made, the verification, that all went according to expectations
is made. In this step, the verification sometimes fails, because there were unexpected
count of requests on each node.
[1]:
https://github.com/Karm/mod_cluster-custom-load-metric
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