Cluster: introduced repl_offset fields in clusterNode.
The two fields are used in order to remember the latest known replication offset and the time we received it from other slave nodes. This will be used by slaves in order to start the election procedure with a delay that is proportional to the rank of the slave among the other slaves for this master, when sorted for replication offset. Usually this allows the slave with the most updated offset to win the election and replace the failing master in the cluster.
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