Index of wsrep status variables

variable wsrep_apply_oooe

This variable shows parallelization efficiency, how often writesets have been applied out of order.

variable wsrep_apply_oool

This variable shows how often a writeset with a higher sequence number was applied before one with a lower sequence number.

variable wsrep_apply_window

Average distance between highest and lowest concurrently applied sequence numbers.

variable wsrep_causal_reads_

Shows the number of writesets processed while the variable wsrep_causal_reads was set to ON.

variable wsrep_cert_bucket_count

Shows the number of cells in the certification index hash-table.

variable wsrep_cert_deps_distance

Average distance between highest and lowest sequence number that can be possibly applied in parallel.

variable wsrep_cert_index_size

Number of entries in the certification index.

variable wsrep_cert_interval

Average number of write-sets received while a transaction replicates.

variable wsrep_cluster_conf_id

The number of cluster membership changes that have taken place.

variable wsrep_cluster_size

Current number of nodes in the cluster.

variable wsrep_cluster_state_uuid

This variable contains UUID state of the cluster. When this value is the same as the one in wsrep_local_state_uuid, node is synced with the cluster.

variable wsrep_cluster_status

Status of the cluster component. Possible values are:

  • Primary
  • Non-Primary
  • Disconnected
variable wsrep_commit_oooe

This variable shows how often a transaction was committed out of order.

variable wsrep_commit_oool

This variable currently has no meaning.

variable wsrep_commit_window

Average distance between highest and lowest concurrently committed sequence number.

variable wsrep_connected

This variable shows if the node is connected to the cluster. If the value is OFF, the node has not yet connected to any of the cluster components. This may be due to misconfiguration.

variable wsrep_evs_delayed

Comma separated list of nodes that are considered delayed. The node format is <uuid>:<address>:<count>, where <count> is the number of entries on delayed list for that node.

variable wsrep_evs_evict_list

List of UUIDs of the evicted nodes.

variable wsrep_evs_repl_latency

This status variable provides information regarding group communication replication latency. This latency is measured in seconds from when a message is sent out to when a message is received.

The format of the output is <min>/<avg>/<max>/<std_dev>/<sample_size>.

variable wsrep_evs_state

Internal EVS protocol state.

variable wsrep_flow_control_interval

This variable shows the lower and upper limits for Galera flow control. The upper limit is the maximum allowed number of requests in the queue. If the queue reaches the upper limit, new requests are denied. As existing requests get processed, the queue decreases, and once it reaches the lower limit, new requests will be allowed again.

variable wsrep_flow_control_interval_high

Shows the upper limit for flow control to trigger.

variable wsrep_flow_control_interval_low

Shows the lower limit for flow control to stop.

variable wsrep_flow_control_paused

Time since the last status query that was paused due to flow control.

variable wsrep_flow_control_paused_ns

Total time spent in a paused state measured in nanoseconds.

variable wsrep_flow_control_recv

Number of FC_PAUSE events received since the last status query. Unlike most status variables, the counter for this one does not reset every time you run the query.

variable wsrep_flow_control_sent

Number of FC_PAUSE events sent since the last status query. Unlike most status variables, the counter for this one does not reset every time you run the query.

variable wsrep_flow_control_status

This variable shows whether a node has flow control enabled for normal traffic. It does not indicate the status of flow control during SST.

variable wsrep_gcache_pool_size

This variable shows the size of the page pool and dynamic memory allocated for GCache (in bytes).

variable wsrep_gcomm_uuid

This status variable exposes UUIDs in gvwstate.dat, which are Galera view IDs (thus unrelated to cluster state UUIDs). This UUID is unique for each node. You will need to know this value when using manual eviction feature.

variable wsrep_incoming_addresses

Shows the comma-separated list of incoming node addresses in the cluster.

variable wsrep_ist_receive_status

Displays the progress of IST for joiner node. If IST is not running, the value is blank. If IST is running, the value is the percentage of transfer completed.

variable wsrep_ist_receive_seqno_end

The sequence number of the last transaction in IST.

variable wsrep_ist_receive_seqno_current

The sequence number of the current transaction in IST.

variable wsrep_ist_receive_seqno_start

The sequence number of the first transaction in IST.

variable wsrep_last_applied

Sequence number of the last applied transaction.

variable wsrep_last_committed

Sequence number of the last committed transaction.

variable wsrep_local_bf_aborts

Number of local transactions that were aborted by replica transactions while being executed.

variable wsrep_local_cached_downto

The lowest sequence number in GCache. This information can be helpful with determining IST and SST. If the value is 0, then it means there are no writesets in GCache (usual for a single node).

variable wsrep_local_cert_failures

Number of writesets that failed the certification test.

variable wsrep_local_commits

Number of writesets commited on the node.

variable wsrep_local_index

Node’s index in the cluster.

variable wsrep_local_recv_queue

Current length of the receive queue (that is, the number of writesets waiting to be applied).

variable wsrep_local_recv_queue_avg

Average length of the receive queue since the last status query. When this number is bigger than 0 this means node can’t apply writesets as fast as they are received. This could be a sign that the node is overloaded and it may cause replication throttling.

variable wsrep_local_replays

Number of transaction replays due to asymmetric lock granularity.

variable wsrep_local_send_queue

Current length of the send queue (that is, the number of writesets waiting to be sent).

variable wsrep_local_send_queue_avg

Average length of the send queue since the last status query. When cluster experiences network throughput issues or replication throttling, this value will be significantly bigger than 0.

variable wsrep_local_state

Internal Galera cluster FSM state number

variable wsrep_local_state_comment

Internal number and the corresponding human-readable comment of the node’s state. Possible values are:

Num Comment Description
1 Joining Node is joining the cluster
2 Donor/Desynced Node is the donor to the node joining the cluster
3 Joined Node has joined the cluster
4 Synced Node is synced with the cluster
variable wsrep_local_state_uuid

The UUID of the state stored on the node.

variable wsrep_monitor_status

The status of the local monitor (local and replicating actions), apply monitor (apply actions of write-set), and commit monitor (commit actions of write sets). In the value of this variable, each monitor (L: Local, A: Apply, C: Commit) is represented as a last_entered, and last_left pair:

wsrep_monitor_status (L/A/C) [ ( 7, 5), (2, 2), ( 2, 2) ]
Shows which transaction or write-set has recently entered the queue
Shows which last transaction or write-set has been executed and left the queue

According to the Galera protocol, transactions can be applied in parallel but must be committed in a given order. This rule implies that there can be multiple transactions in the apply state at a given point of time but transactions are committed sequentially.

See also

Galera Documentation: Database replication
variable wsrep_protocol_version

Version of the wsrep protocol used.

variable wsrep_provider_name

Name of the wsrep provider (usually Galera).

variable wsrep_provider_vendor

Name of the wsrep provider vendor (usually Codership Oy)

variable wsrep_provider_version

Current version of the wsrep provider.

variable wsrep_ready

This variable shows if node is ready to accept queries. If status is OFF, almost all queries will fail with ERROR 1047 (08S01) Unknown Command error (unless the wsrep_on variable is set to 0).

variable wsrep_received

Total number of writesets received from other nodes.

variable wsrep_received_bytes

Total size (in bytes) of writesets received from other nodes.

variable wsrep_repl_data_bytes

Total size (in bytes) of data replicated.

variable wsrep_repl_keys

Total number of keys replicated.

variable wsrep_repl_keys_bytes

Total size (in bytes) of keys replicated.

variable wsrep_repl_other_bytes

Total size of other bits replicated.

variable wsrep_replicated

Total number of writesets sent to other nodes.

variable wsrep_replicated_bytes

Total size of replicated writesets. To compute the actual size of bytes sent over network to cluster peers, multiply the value of this variable by the number of cluster peers in the given network segment.

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