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  1. MariaDB Server
  2. MDEV-32366

WSREP closes because of high traffic load and other replication

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      This Bug now happend twice and the server stopped to replicate in the galera cluster with wsrep because of an high load (not sure) with an classic mysql replication of the second mariadb server which replicates with an mysql 5.7 server for data migration.

      We dont understand why the server stopps to replicate over wsrep but still runs normally and is reachable, queryble, ...
      The haproxy in front can still login so it doesnt switch to the other backup server for connections.

      This is the problematic one:

      MariaDB [(none)]> show status like "%wsrep%";
      +-------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------+
      | Variable_name                 | Value                                                                                                                                          |
      +-------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------+
      | wsrep_local_state_uuid        | 00000000-0000-0000-0000-000000000000                                                                                                           |
      | wsrep_protocol_version        | 10                                                                                                                                             |
      | wsrep_last_committed          | -1                                                                                                                                             |
      | wsrep_replicated              | 3928800                                                                                                                                        |
      | wsrep_replicated_bytes        | 6318098688                                                                                                                                     |
      | wsrep_repl_keys               | 31628277                                                                                                                                       |
      | wsrep_repl_keys_bytes         | 347319288                                                                                                                                      |
      | wsrep_repl_data_bytes         | 5696592424                                                                                                                                     |
      | wsrep_repl_other_bytes        | 0                                                                                                                                              |
      | wsrep_received                | 495184                                                                                                                                         |
      | wsrep_received_bytes          | 334286424                                                                                                                                      |
      | wsrep_local_commits           | 3928751                                                                                                                                        |
      | wsrep_local_cert_failures     | 0                                                                                                                                              |
      | wsrep_local_replays           | 0                                                                                                                                              |
      | wsrep_local_send_queue        | 0                                                                                                                                              |
      | wsrep_local_send_queue_max    | 26                                                                                                                                             |
      | wsrep_local_send_queue_min    | 0                                                                                                                                              |
      | wsrep_local_send_queue_avg    | 0.0146288                                                                                                                                      |
      | wsrep_local_recv_queue        | 0                                                                                                                                              |
      | wsrep_local_recv_queue_max    | 102                                                                                                                                            |
      | wsrep_local_recv_queue_min    | 0                                                                                                                                              |
      | wsrep_local_recv_queue_avg    | 0.0784936                                                                                                                                      |
      | wsrep_local_cached_downto     | 9752343                                                                                                                                        |
      | wsrep_flow_control_paused_ns  | 9770684545                                                                                                                                     |
      | wsrep_flow_control_paused     | 4.2607e-06                                                                                                                                     |
      | wsrep_flow_control_sent       | 48                                                                                                                                             |
      | wsrep_flow_control_recv       | 584                                                                                                                                            |
      | wsrep_flow_control_active     | false                                                                                                                                          |
      | wsrep_flow_control_requested  | false                                                                                                                                          |
      | wsrep_cert_deps_distance      | 23.8889                                                                                                                                        |
      | wsrep_apply_oooe              | 0.0216107                                                                                                                                      |
      | wsrep_apply_oool              | 0.0038792                                                                                                                                      |
      | wsrep_apply_window            | 1.03378                                                                                                                                        |
      | wsrep_apply_waits             | 0                                                                                                                                              |
      | wsrep_commit_oooe             | 0                                                                                                                                              |
      | wsrep_commit_oool             | 0                                                                                                                                              |
      | wsrep_commit_window           | 1.00543                                                                                                                                        |
      | wsrep_local_state             | 5                                                                                                                                              |
      | wsrep_local_state_comment     | Inconsistent                                                                                                                                   |
      | wsrep_cert_index_size         | 21                                                                                                                                             |
      | wsrep_causal_reads            | 0                                                                                                                                              |
      | wsrep_cert_interval           | 152.001                                                                                                                                        |
      | wsrep_open_transactions       | 0                                                                                                                                              |
      | wsrep_open_connections        | 0                                                                                                                                              |
      | wsrep_incoming_addresses      |                                                                                                                                                |
      | wsrep_applier_thread_count    | 0                                                                                                                                              |
      | wsrep_cluster_capabilities    |                                                                                                                                                |
      | wsrep_cluster_conf_id         | 18446744073709551615                                                                                                                           |
      | wsrep_cluster_size            | 0                                                                                                                                              |
      | wsrep_cluster_state_uuid      | d33e2bef-eb15-11ed-b37c-bbeed863e828                                                                                                           |
      | wsrep_cluster_status          | Disconnected                                                                                                                                   |
      | wsrep_connected               | OFF                                                                                                                                            |
      | wsrep_local_bf_aborts         | 0                                                                                                                                              |
      | wsrep_local_index             | 18446744073709551615                                                                                                                           |
      | wsrep_provider_capabilities   | :MULTI_MASTER:CERTIFICATION:PARALLEL_APPLYING:TRX_REPLAY:ISOLATION:PAUSE:CAUSAL_READS:INCREMENTAL_WRITESET:UNORDERED:PREORDERED:STREAMING:NBO: |
      | wsrep_provider_name           | Galera                                                                                                                                         |
      | wsrep_provider_vendor         | Codership Oy <info@codership.com>                                                                                                              |
      | wsrep_provider_version        | 4.11(r7b59af73)                                                                                                                                |
      | wsrep_ready                   | OFF                                                                                                                                            |
      | wsrep_rollbacker_thread_count | 1                                                                                                                                              |
      | wsrep_thread_count            | 1                                                                                                                                              |
      +-------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------+
      

      And the other one:

      MariaDB [(none)]> show status like "%wsrep%";
      +-------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------+
      | Variable_name                 | Value                                                                                                                                          |
      +-------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------+
      | wsrep_local_state_uuid        | 00000000-0000-0000-0000-000000000000                                                                                                           |
      | wsrep_protocol_version        | 10                                                                                                                                             |
      | wsrep_last_committed          | -1                                                                                                                                             |
      | wsrep_replicated              | 3928800                                                                                                                                        |
      | wsrep_replicated_bytes        | 6318098688                                                                                                                                     |
      | wsrep_repl_keys               | 31628277                                                                                                                                       |
      | wsrep_repl_keys_bytes         | 347319288                                                                                                                                      |
      | wsrep_repl_data_bytes         | 5696592424                                                                                                                                     |
      | wsrep_repl_other_bytes        | 0                                                                                                                                              |
      | wsrep_received                | 495184                                                                                                                                         |
      | wsrep_received_bytes          | 334286424                                                                                                                                      |
      | wsrep_local_commits           | 3928751                                                                                                                                        |
      | wsrep_local_cert_failures     | 0                                                                                                                                              |
      | wsrep_local_replays           | 0                                                                                                                                              |
      | wsrep_local_send_queue        | 0                                                                                                                                              |
      | wsrep_local_send_queue_max    | 26                                                                                                                                             |
      | wsrep_local_send_queue_min    | 0                                                                                                                                              |
      | wsrep_local_send_queue_avg    | 0.0146288                                                                                                                                      |
      | wsrep_local_recv_queue        | 0                                                                                                                                              |
      | wsrep_local_recv_queue_max    | 102                                                                                                                                            |
      | wsrep_local_recv_queue_min    | 0                                                                                                                                              |
      | wsrep_local_recv_queue_avg    | 0.0784936                                                                                                                                      |
      | wsrep_local_cached_downto     | 9752343                                                                                                                                        |
      | wsrep_flow_control_paused_ns  | 9770684545                                                                                                                                     |
      | wsrep_flow_control_paused     | 4.26199e-06                                                                                                                                    |
      | wsrep_flow_control_sent       | 48                                                                                                                                             |
      | wsrep_flow_control_recv       | 584                                                                                                                                            |
      | wsrep_flow_control_active     | false                                                                                                                                          |
      | wsrep_flow_control_requested  | false                                                                                                                                          |
      | wsrep_cert_deps_distance      | 23.8889                                                                                                                                        |
      | wsrep_apply_oooe              | 0.0216107                                                                                                                                      |
      | wsrep_apply_oool              | 0.0038792                                                                                                                                      |
      | wsrep_apply_window            | 1.03378                                                                                                                                        |
      | wsrep_apply_waits             | 0                                                                                                                                              |
      | wsrep_commit_oooe             | 0                                                                                                                                              |
      | wsrep_commit_oool             | 0                                                                                                                                              |
      | wsrep_commit_window           | 1.00543                                                                                                                                        |
      | wsrep_local_state             | 5                                                                                                                                              |
      | wsrep_local_state_comment     | Inconsistent                                                                                                                                   |
      | wsrep_cert_index_size         | 21                                                                                                                                             |
      | wsrep_causal_reads            | 0                                                                                                                                              |
      | wsrep_cert_interval           | 152.001                                                                                                                                        |
      | wsrep_open_transactions       | 0                                                                                                                                              |
      | wsrep_open_connections        | 0                                                                                                                                              |
      | wsrep_incoming_addresses      |                                                                                                                                                |
      | wsrep_applier_thread_count    | 0                                                                                                                                              |
      | wsrep_cluster_capabilities    |                                                                                                                                                |
      | wsrep_cluster_conf_id         | 18446744073709551615                                                                                                                           |
      | wsrep_cluster_size            | 0                                                                                                                                              |
      | wsrep_cluster_state_uuid      | d33e2bef-eb15-11ed-b37c-bbeed863e828                                                                                                           |
      | wsrep_cluster_status          | Disconnected                                                                                                                                   |
      | wsrep_connected               | OFF                                                                                                                                            |
      | wsrep_local_bf_aborts         | 0                                                                                                                                              |
      | wsrep_local_index             | 18446744073709551615                                                                                                                           |
      | wsrep_provider_capabilities   | :MULTI_MASTER:CERTIFICATION:PARALLEL_APPLYING:TRX_REPLAY:ISOLATION:PAUSE:CAUSAL_READS:INCREMENTAL_WRITESET:UNORDERED:PREORDERED:STREAMING:NBO: |
      | wsrep_provider_name           | Galera                                                                                                                                         |
      | wsrep_provider_vendor         | Codership Oy <info@codership.com>                                                                                                              |
      | wsrep_provider_version        | 4.11(r7b59af73)                                                                                                                                |
      | wsrep_ready                   | OFF                                                                                                                                            |
      | wsrep_rollbacker_thread_count | 1                                                                                                                                              |
      | wsrep_thread_count            | 1                                                                                                                                              |
      +-------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------+
      

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            janlindstrom Jan Lindström
            dcz01 Daniel Czadek
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