FLUSH STATUS zeroes up wsrep_cluster_size and wsrep_local_index

[Alex Yurchenko]

This is likely because wsrep_cluster_size and wsrep_local_index reside in mysqld unlike the rest of status variables.

Before FLUSH STATUS:

+----------------------------+-------------------------------------------------+
| Variable_name | Value |
+----------------------------+-------------------------------------------------+
| wsrep_local_state_uuid | b88da040-2721-11e3-a23c-ea75bf4d1b2a |
| wsrep_protocol_version | 5 |
| wsrep_last_committed | 0 |
| wsrep_replicated | 0 |
| wsrep_replicated_bytes | 0 |
| wsrep_repl_keys | 0 |
| wsrep_repl_keys_bytes | 0 |
| wsrep_repl_data_bytes | 0 |
| wsrep_repl_other_bytes | 0 |
| wsrep_received | 7 |
| wsrep_received_bytes | 1008 |
| wsrep_local_commits | 0 |
| wsrep_local_cert_failures | 0 |
| wsrep_local_replays | 0 |
| wsrep_local_send_queue | 0 |
| wsrep_local_send_queue_avg | 0.000000 |
| wsrep_local_recv_queue | 0 |
| wsrep_local_recv_queue_avg | 0.250000 |
| wsrep_flow_control_paused | 0.000000 |
| wsrep_flow_control_sent | 0 |
| wsrep_flow_control_recv | 0 |
| wsrep_cert_deps_distance | 0.000000 |
| wsrep_apply_oooe | 0.000000 |
| wsrep_apply_oool | 0.000000 |
| wsrep_apply_window | 0.000000 |
| wsrep_commit_oooe | 0.000000 |
| wsrep_commit_oool | 0.000000 |
| wsrep_commit_window | 0.000000 |
| wsrep_local_state | 4 |
| wsrep_local_state_comment | Synced |
| wsrep_cert_index_size | 0 |
| wsrep_causal_reads | 0 |
| wsrep_incoming_addresses | 10.21.32.1:3305,10.21.32.1:3303,10.21.32.1:3304 |
| wsrep_cluster_conf_id | 4 |
| wsrep_cluster_size | 3 |
| wsrep_cluster_state_uuid | b88da040-2721-11e3-a23c-ea75bf4d1b2a |
| wsrep_cluster_status | Primary |
| wsrep_connected | ON |
| wsrep_local_index | 1 |
| wsrep_provider_name | Galera |
| wsrep_provider_vendor | Codership Oy <email address hidden> |
| wsrep_provider_version | 3.1dev(r1978) |
| wsrep_ready | ON |
+----------------------------+-------------------------------------------------+
43 rows in set (0.00 sec)

mysql> flush status;
Query OK, 0 rows affected (0.01 sec)

mysql> show status like 'wsrep%';
+----------------------------+-------------------------------------------------+
| Variable_name | Value |
+----------------------------+-------------------------------------------------+
| wsrep_local_state_uuid | b88da040-2721-11e3-a23c-ea75bf4d1b2a |
| wsrep_protocol_version | 5 |
| wsrep_last_committed | 0 |
| wsrep_replicated | 0 |
| wsrep_replicated_bytes | 0 |
| wsrep_repl_keys | 0 |
| wsrep_repl_keys_bytes | 0 |
| wsrep_repl_data_bytes | 0 |
| wsrep_repl_other_bytes | 0 |
| wsrep_received | 7 |
| wsrep_received_bytes | 1008 |
| wsrep_local_commits | 0 |
| wsrep_local_cert_failures | 0 |
| wsrep_local_replays | 0 |
| wsrep_local_send_queue | 0 |
| wsrep_local_send_queue_avg | 0.000000 |
| wsrep_local_recv_queue | 0 |
| wsrep_local_recv_queue_avg | 0.000000 |
| wsrep_flow_control_paused | 0.000000 |
| wsrep_flow_control_sent | 0 |
| wsrep_flow_control_recv | 0 |
| wsrep_cert_deps_distance | 0.000000 |
| wsrep_apply_oooe | 0.000000 |
| wsrep_apply_oool | 0.000000 |
| wsrep_apply_window | 0.000000 |
| wsrep_commit_oooe | 0.000000 |
| wsrep_commit_oool | 0.000000 |
| wsrep_commit_window | 0.000000 |
| wsrep_local_state | 4 |
| wsrep_local_state_comment | Synced |
| wsrep_cert_index_size | 0 |
| wsrep_causal_reads | 0 |
| wsrep_incoming_addresses | 10.21.32.1:3305,10.21.32.1:3303,10.21.32.1:3304 |
| wsrep_cluster_conf_id | 4 |
| wsrep_cluster_size | 0 |
| wsrep_cluster_state_uuid | b88da040-2721-11e3-a23c-ea75bf4d1b2a |
| wsrep_cluster_status | Primary |
| wsrep_connected | ON |
| wsrep_local_index | 0 |
| wsrep_provider_name | Galera |
| wsrep_provider_vendor | Codership Oy <email address hidden> |
| wsrep_provider_version | 3.1dev(r1978) |
| wsrep_ready | ON |
+----------------------------+-------------------------------------------------+
43 rows in set (0.01 sec)

[Vladislav Klyachin (klyachin)]

Fix pushed in wsrep-5.5-23 in revision: http://bazaar.launchpad.net/~codership/codership-mysql/5.5-23/revision/3938
Fix pushed in wsrep-5.5 in revision: http://bazaar.launchpad.net/~codership/codership-mysql/wsrep-5.5/revision/3915
Fix pushed in wsrep-5.6 in revision: http://bazaar.launchpad.net/~codership/codership-mysql/5.6/revision/4000

[Shahriyar Rzayev (rzayev-sehriyar)]

Percona now uses JIRA for bug reports so this bug report is migrated to: https://jira.percona.com/browse/PXC-1454