ldb

LDB supports different CRDT replication models:

• state-based
• delta-state-based
• pure-op-based

Next features:

• implement Delta-state-based replication (as in http://novasys.di.fct.unl.pt/~alinde/publications/a12-van_der_linde.pdf)
• implement new replication model only using join-decompositions (http://haslab.uminho.pt/cbm/files/pmldc-2016-join-decomposition.pdf)

Configuration

• LDB_MODE:
  • state_based
  • delta_based
  • pure_op_based
• LDB_REDUNDANT_DGROUPS: when set to true, removes redundant state that may be present in the received delta-groups, using join-decompositions
• LDB_DGROUP_BACK_PROPAGATION: when set to true, avoids back-propagation of delta-groups
• LDB_METRICS: metrics are recorded if true

LDB_REDUNDANT_DGROUPS and LDB_DGROUP_BACK_PROPAGATION only have an effect if LDB_MODE=delta_based.