[infinispan-issues] [JBoss JIRA] (ISPN-4683) DefaultConsistentHash segment size is not not computed correctly

[Dan Berindei (JIRA)]

     [ https://issues.jboss.org/browse/ISPN-4683?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dan Berindei updated ISPN-4683:
-------------------------------
    Priority: Critical  (was: Major)


> DefaultConsistentHash segment size is not not computed correctly
> ----------------------------------------------------------------
>
>                 Key: ISPN-4683
>                 URL: https://issues.jboss.org/browse/ISPN-4683
>             Project: Infinispan
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>          Components: Core, Remote Protocols
>    Affects Versions: 6.0.2.Final, 7.0.0.Beta1
>            Reporter: Dan Berindei
>            Assignee: Dan Berindei
>            Priority: Critical
>             Fix For: 7.0.0.Beta2
>
>
> The segment size is computed using {{o.i.commons.util.Util.getSegmentSize()}} both on the server and in the Java client. The computation uses {{float}} division, but {{float}} precision is not good enough and sometimes the segments are too small (e.g. with 200 segments, the segment size is 10737418 instead of 10737419). This means the keys with a hash of {{Integer.MAX_VALUE}} or {{-1}} are not properly mapped to a segment.



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