[jboss-jira] [JBoss JIRA] Created: (AS7-1170) support configuration of number of virtual nodes

[Michal Linhard (JIRA)]

support configuration of number of virtual nodes
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                 Key: AS7-1170
                 URL: https://issues.jboss.org/browse/AS7-1170
             Project: Application Server 7
          Issue Type: Feature Request
          Components: Clustering
    Affects Versions: 7.0.0.CR1
            Reporter: Michal Linhard
            Assignee: Paul Ferraro
            Priority: Critical


I recently played with consistent hash function implementation and produced various performance statistics.
It shows that number of virtual nodes (configuration parameter I98 in https://docspace.corp.redhat.com/docs/DOC-69249) has substantial effect on performance. (it makes distribution of data among nodes in the cluster much more even and thus avoids overstressing of one particular node, that would then hinder performance of the whole cluster)

If the next EDG6 Alpha build will take configuration from infinispan subsystem, we'll need to have this configurable, otherwise we won't be able to execute some very important performance comparisons.

it applies to the level of subsystem.cache-container.distributed-cache

so I propose addition of configuration parameter:
subsystem.cache-container.distributed-cache.numVirtualNodes that would have the same effect as I98 infinispan.configuration.clustering.hash.numVirtualNodes

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