castellanprime / ldb

Replication of CRDTs

ldb

LDB supports different CRDT replication models:

• state-based
• delta-state-based
• dotted-based (scuttebutt)

Configuration

• LDB_MODE:
  • state_based
  • delta_based
  • scuttlebutt
  • vanilla_scuttlebutt
• LDB_STATE_SYNC_INTERVAL: state is propagated every X milliseconds
• 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

State-based and delta-based modes are described here, as well as the optimizations removal of redundant delta-groups and avoiding back-propagation of delta-groups.

NODE_NUMBER	0..	0..	0..
LDB_MODE	state_based	delta_based	scuttlebutt
LDB_STATE_SYNC_INTERVAL	0..	0..	0..
LDB_REDUNDANT_DGROUPS	NA	true / false	NA
LDB_DGROUP_BACK_PROPAGATION	NA	true / false	NA

Defaults

• LDB_MODE: state_based
• LDB_STATE_SYNC_INTERVAL: 1000
• LDB_REDUNDANT_DGROUPS: false
• LDB_DGROUP_BACK_PROPAGATION: false