The feature is called timeline-consistent because the secondaries apply the edits in the order that the primary committed them. This is actually a good design choice as these clauses are not necessary for data warehouses. The intermediate key-value pairs produced by the Map function are buffered in memory. Big Data is thus very important to foster productivity growth in Europe since it is affecting not only software - intensive industries but also public services, for example the health, administration and education sectors. Compared to Paxos, Zab is primarily designed for primarybackup systems rather than for state machine replication.
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