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

[Dan Berindei (JIRA)]

Dan Berindei created ISPN-2420:
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             Summary: 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: 5.2.0.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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