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_EVICTION_ROUND_NUMBER: evict a peer from the ack map if no ack is received from this peer after X rounds of state synchronization (where messages where sent to this peer). If this value is -1, peer eviction is not performed
• 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_MODE | state_based | delta_based | pure_op_based | | LDB_DRIVEN_MODE | none / state_driven / digest_driven | none / state_driven / digest_driven | NA | | LDB_STATE_SYNC_INTERVAL | 0.. | 0.. | NA | | LDB_EVICTION_ROUND_NUMBER | NA | -1.. | NA | | LDB_REDUNDANT_DGROUPS | NA | true / false | NA | | LDB_DGROUP_BACK_PROPAGATION | NA | true / false | NA |

Defaults

• LDB_MODE: state_based
• LDB_DRIVEN_MODE: none
• LDB_STATE_SYNC_INTERVAL: 1000
• LDB_EVICTION_ROUND_NUMBER: -1
• LDB_REDUNDANT_DGROUPS: false
• LDB_DGROUP_BACK_PROPAGATION: false
• LDB_METRICS: false