Monitoring Strong Consistency
Riak KV's strong consistency is an experimental feature and may be removed from the product in the future. Strong consistency is not commercially supported or production-ready. Strong consistency is incompatible with Multi-Datacenter Replication, Riak Search, Bitcask Expiration, LevelDB Secondary Indexes, Riak Data Types and Commit Hooks. We do not recommend its usage in any production environment.
Monitoring Strong Consistency
Riak provides a wide variety of data related to the current operating
status of a node. This data is available by running the riak-admin status command. That data now
includes statistics specific to strongly consistent operations.
A full listing of these stats is available in Inspecting a Node.
All strong consistency-related stats are prefixed with consistent_,
e.g. consistent_gets, consistent_puts, etc. Many of these stats are
so-called "one-minute stats," meaning that they reflect node activity in
the last minute.
Strong consistency stats fall into two categories: GET-related and PUT-related stats.
GET-related stats
| Stat | Description |
|---|---|
consistent_gets | Number of strongly consistent GETs coordinated by this node in the last minute |
consistent_gets_total | Total number of strongly consistent GETs coordinated by this node |
consistent_get_objsize_mean | Mean object size for strongly consistent GETs on this node in the last minute |
consistent_get_objsize_median | Median object size for strongly consistent GETs on this node in the last minute |
consistent_get_objsize_95 | 95th-percentile object size for strongly consistent GETs on this node in the last minute |
consistent_get_objsize_99 | 99th-percentile object size for strongly consistent GETs on this node in the last minute |
consistent_get_objsize_100 | 100th-percentile object size for strongly consistent GETs on this node in the last minute |
consistent_get_time_mean | Mean time between reception of client GETs to strongly consistent keys and subsequent response |
consistent_get_time_median | Median time between reception of client GETs to strongly consistent keys and subsequent response |
consistent_get_time_95 | 95th-percentile time between reception of client GETs to strongly consistent keys and subsequent response |
consistent_get_time_99 | 99th-percentile time between reception of client GETs to strongly consistent keys and subsequent response |
consistent_get_time_100 | 100th-percentile time between reception of client GETs to strongly consistent keys and subsequent response |
PUT-related stats
| Stat | Description |
|---|---|
consistent_puts | Number of strongly consistent PUTs coordinated by this node in the last minute |
consistent_puts_total | Total number of strongly consistent PUTs coordinated by this node |
consistent_put_objsize_mean | Mean object size for strongly consistent PUTs on this node in the last minute |
consistent_put_objsize_median | Median object size for strongly consistent PUTs on this node in the last minute |
consistent_put_objsize_95 | 95th-percentile object size for strongly consistent PUTs on this node in the last minute |
consistent_put_objsize_99 | 99th-percentile object size for strongly consistent PUTs on this node in the last minute |
consistent_put_objsize_100 | 100th-percentile object size for strongly consistent PUTs on this node in the last minute |
consistent_put_time_mean | Mean time between reception of client PUTs to strongly consistent keys and subsequent response |
consistent_put_time_median | Median time between reception of client PUTs to strongly consistent keys and subsequent response |
consistent_put_time_95 | 95th-percentile time between reception of client PUTs to strongly consistent keys and subsequent response |
consistent_put_time_99 | 99th-percentile time between reception of client PUTs to strongly consistent keys and subsequent response |
consistent_put_time_100 | 100th-percentile time between reception of client PUTs to strongly consistent keys and subsequent response |