[infinispan-issues] [JBoss JIRA] (ISPN-4851) Make SyncConsistentHashFactory the default CH factory

[William Burns (JIRA)]

     [ https://issues.jboss.org/browse/ISPN-4851?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

William Burns updated ISPN-4851:
--------------------------------
    Fix Version/s: 7.2.0.Alpha1
                       (was: 7.1.0.Final)


> Make SyncConsistentHashFactory the default CH factory
> -----------------------------------------------------
>
>                 Key: ISPN-4851
>                 URL: https://issues.jboss.org/browse/ISPN-4851
>             Project: Infinispan
>          Issue Type: Feature Request
>          Components: Configuration, Core
>    Affects Versions: 7.0.0.CR1
>            Reporter: Dan Berindei
>            Assignee: Dan Berindei
>             Fix For: 7.2.0.Alpha1
>
>
> With ISPN-4682 fixed, SyncConsistentHashFactory should be good enough to be the default. It still allows for more variation in the number of owned segments per node (+/-10% owned segments and +/-20% for primary-owned segments), but that should be acceptable for most purposes. 
> The major advantage of SCHF is that it depends only on the cache members and not on the order they joined. Users expect a key to map to the same node in all caches (as long as the caches have the same members).
> One downside of SCHF, especially for testing, is that the segment ownership differs between test runs (being based on the random address assigned to each node). However, most tests that depend on key ownership should use {{ControlledConsistentHashFactory}} anyway.
> We also need to verify that the number of segments moved by SCHF is comparable to the number of segments moved by DefaultConsistentHashFactory (ISPN-3729).



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