[infinispan-issues] [JBoss JIRA] (ISPN-4587) Re-add old owners in the pending CH when a node leaves during rebalance

[Dan Berindei (JIRA)]

Dan Berindei created ISPN-4587:
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             Summary: Re-add old owners in the pending CH when a node leaves during rebalance
                 Key: ISPN-4587
                 URL: https://issues.jboss.org/browse/ISPN-4587
             Project: Infinispan
          Issue Type: Enhancement
      Security Level: Public (Everyone can see)
          Components: Core, State Transfer
    Affects Versions: 7.0.0.Alpha5
            Reporter: Dan Berindei
            Assignee: Dan Berindei
            Priority: Minor
             Fix For: 7.0.0.Beta1


Say we have a distributed cache \[A, B\] with {{numSegments = 1}} and {{numOwners = 2}}. The initial topology is _T_: currentCH = {0: A B}, pendingCH = null

C joins, and A starts a rebalance. The topology is now _T + 1_: currentCH = {0: A B}, pendingCH = {0: A C}

C now leaves, A updates the consistent hashes to remove it with a new topology _T + 2: currentCH = {0: A B}, pendingCH = {0: A}

A doesn't need to receive any data, so the rebalance ends and the pending CH is installed as the current CH in topology _T + 3_: currentCH = {0: A}, pendingCH = null

This algorithm is relatively easy to follow and implement, but it does result in reduced availability of the cache data. It would be better if topology _T + 2_ could re-add B as an owner in the pending CH.



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