ldb

LDB supports different CRDT replication models:

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

Configuration

• LDB_MODE:
  • state_based
  • delta_based
  • pure_op_based
• LDB_DRIVEN_MODE: see this for details on state_driven and digest_driven algorithms
  • none
  • state_driven
  • digest_driven
• LDB_STATE_SYNC_INTERVAL: in state_based and delta_based modes, 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
• LDB_DBUFFER_SHRINK_INTERVAL: in delta_based mode, try to shrink the delta buffer every X milliseconds
• LDB_DBUFFER_SHRINK_MODE:
  • normal: remove acknowledged entries in the buffer
  • dummy: remove all entries in the buffer (note that this mode is only for evaluation purposes)
• LDB_METRICS: metrics are recorded if true

Defaults

• LDB_MODE: state_based
• LDB_DRIVEN_MODE: none
• LDB_STATE_SYNC_INTERVAL: 1000
• LDB_REDUNDANT_DGROUPS: false
• LDB_DGROUP_BACK_PROPAGATION: false
• LDB_DBUFFER_SHRINK_INTERVAL: 20000
• LDB_DBUFFER_SHRINK_MODE: normal
• LDB_METRICS: false