[infinispan-issues] [JBoss JIRA] (ISPN-2420) Increment the topology id when a node leaves the cache

[Mircea Markus (JIRA)]

     [ https://issues.jboss.org/browse/ISPN-2420?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mircea Markus updated ISPN-2420:
--------------------------------

        Status: Resolved  (was: Pull Request Sent)
    Resolution: Done

    
> Increment the topology id when a node leaves the cache
> ------------------------------------------------------
>
>                 Key: ISPN-2420
>                 URL: https://issues.jboss.org/browse/ISPN-2420
>             Project: Infinispan
>          Issue Type: Feature Request
>          Components: State transfer
>    Affects Versions: 5.2.0.Beta2
>            Reporter: Dan Berindei
>            Assignee: Dan Berindei
>             Fix For: 6.0.0.Final
>
>
> We currently increment the topology id only when we "rebalance" the consistent hash (i.e. we add new owners). This allows us to to do some optimizations after a leave, like not forwarding commands (because there are no new owners).
> Unfortunately, it is not very intuitive, because it doesn't match how JGroups works, so it can cause bugs like ISPN-2417.
> Additionally, it turns out there are many places where we care that a node left, so the code is more complex to handle this (e.g. TransactionTable.useStrictTopologyIdComparison()), or it is more slow for the common case when there is no leaver (e.g. LocalTransaction.getCommitNodes()).

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