apache/kafka — pull request #39 by tedxia (2014-12-29 07:25:43+00:00)
Title: KAFKA-1833: OfflinePartitionLeaderSelector may return null leader when ISR and Assgi...

In OfflinePartitonLeaderSelector::selectLeader, when liveBrokerInIsr is not empty and have no common broker with liveAssignedreplicas, selectLeader will return no leader;