正常なクラスターでseqno -1が設定されたgrastate.dat。どうして？
これらのバージョンを使用します。
# rpm -qa | egrep '(galera|maria)'
mariadb-libs-5.5.41-2.el7_0.x86_64
mariadb-galera-common-5.5.40-6.el7ost.x86_64
mariadb-galera-server-5.5.40-6.el7ost.x86_64
mariadb-5.5.41-2.el7_0.x86_64
galera-25.3.5-6.el7ost.x86_64
それが私たちのgrastate.datです
# cat /var/lib/mysql/data/grastate.dat
# GALERA saved state
version: 2.1
uuid: e7ead849-f2a3-11e4-bfda-7f651f709ee3
seqno: -1
cert_index:
seqno: -1魚のように見えます。他のクラスターには数があります。理由はわかりません。ドキュメントによると、これは「クラッシュした」ようです。 -1は停止後です。しかし、このクラスターは健全です。
修正時刻はずっと前です
# stat /var/lib/mysql/data/grastate.dat
File: â/var/lib/mysql/data/grastate.datâ
Size: 104 Blocks: 8 IO Block: 4096 regular file
Device: fd09h/64777d Inode: 108 Links: 1
Access: (0660/-rw-rw----) Uid: ( 1000/ mysql) Gid: ( 1000/ mysql)
Context: system_u:object_r:mysqld_db_t:s0
Access: 2015-07-29 14:51:25.170699518 +0200
Modify: 2015-06-02 11:50:21.564360655 +0200
Change: 2015-06-02 11:50:21.564360655 +0200
Birth: -
ログから（エラーと情報のみと警告のみ）：
150504 23:24:11 [Note] WSREP: gcomm: connected
150504 23:24:11 [Note] WSREP: Changing maximum packet size to 64500, resulting msg size: 32636
150504 23:24:11 [Note] WSREP: Shifting CLOSED -> OPEN (TO: 0)
150504 23:24:11 [Note] WSREP: Opened channel 'galera_cluster'
150504 23:24:11 [Note] WSREP: New COMPONENT: primary = yes, bootstrap = no, my_idx = 0, memb_num = 1
150504 23:24:11 [Note] WSREP: Waiting for SST to complete.
150504 23:24:11 [Note] WSREP: Starting new group from scratch: e7ead849-f2a3-11e4-bfda-7f651f709ee3
150504 23:24:11 [Note] WSREP: STATE_EXCHANGE: sent state UUID: e7eae37d-f2a3-11e4-a76e-6e8297197928
150504 23:24:11 [Note] WSREP: STATE EXCHANGE: sent state msg: e7eae37d-f2a3-11e4-a76e-6e8297197928
150504 23:24:11 [Note] WSREP: STATE EXCHANGE: got state msg: e7eae37d-f2a3-11e4-a76e-6e8297197928 from 0 (hostname.domain)
150504 23:24:11 [Note] WSREP: Quorum results:
version = 3,
component = PRIMARY,
conf_id = 0,
members = 1/1 (joined/total),
act_id = 0,
last_appl. = -1,
protocols = 0/5/3 (gcs/repl/appl),
group UUID = e7ead849-f2a3-11e4-bfda-7f651f709ee3
150504 23:24:11 [Note] WSREP: Flow-control interval: [16, 16]
150504 23:24:11 [Note] WSREP: Restored state OPEN -> JOINED (0)
150504 23:24:11 [Note] WSREP: Member 0.0 (hostname.domain) synced with group.
150504 23:24:11 [Note] WSREP: Shifting JOINED -> SYNCED (TO: 0)
150504 23:24:11 [Note] WSREP: New cluster view: global state: e7ead849-f2a3-11e4-bfda-7f651f709ee3:0, view# 1: Primary, number of nodes: 1, my index: 0, protocol version 3
150504 23:24:11 [Note] WSREP: SST complete, seqno: 0
150504 23:24:11 InnoDB: The InnoDB memory heap is disabled
150504 23:24:11 InnoDB: Mutexes and rw_locks use GCC atomic builtins
150504 23:24:11 InnoDB: Compressed tables use zlib 1.2.7
150504 23:24:11 InnoDB: Using Linux native AIO
状態
> SHOW STATUS LIKE 'wsrep%';
+------------------------------+----------------------------------------------------------+
| Variable_name | Value |
+------------------------------+----------------------------------------------------------+
| wsrep_local_state_uuid | e7ead849-f2a3-11e4-bfda-7f651f709ee3 |
| wsrep_protocol_version | 5 |
| wsrep_last_committed | 15995162 |
| wsrep_replicated | 15995162 |
| wsrep_replicated_bytes | 7552231516 |
| wsrep_repl_keys | 73658848 |
| wsrep_repl_keys_bytes | 957160108 |
| wsrep_repl_data_bytes | 5571381040 |
| wsrep_repl_other_bytes | 0 |
| wsrep_received | 127686 |
| wsrep_received_bytes | 1023418 |
| wsrep_local_commits | 15994368 |
| wsrep_local_cert_failures | 8 |
| wsrep_local_replays | 0 |
| wsrep_local_send_queue | 0 |
| wsrep_local_send_queue_avg | 0.000063 |
| wsrep_local_recv_queue | 0 |
| wsrep_local_recv_queue_avg | 0.002921 |
| wsrep_local_cached_downto | 15719139 |
| wsrep_flow_control_paused_ns | 0 |
| wsrep_flow_control_paused | 0.000000 |
| wsrep_flow_control_sent | 0 |
| wsrep_flow_control_recv | 0 |
| wsrep_cert_deps_distance | 1.046783 |
| wsrep_apply_oooe | 0.008655 |
| wsrep_apply_oool | 0.000000 |
| wsrep_apply_window | 1.009090 |
| wsrep_commit_oooe | 0.000000 |
| wsrep_commit_oool | 0.000000 |
| wsrep_commit_window | 1.000440 |
| wsrep_local_state | 4 |
| wsrep_local_state_comment | Synced |
| wsrep_cert_index_size | 57 |
| wsrep_causal_reads | 0 |
| wsrep_cert_interval | 0.011088 |
| wsrep_incoming_addresses | 192.168.221.22:3306,192.168.211.20:3306,192.168.210.21:3306 |
| wsrep_cluster_conf_id | 6 |
| wsrep_cluster_size | 3 |
| wsrep_cluster_state_uuid | e7ead849-f2a3-11e4-bfda-7f651f709ee3 |
| wsrep_cluster_status | Primary |
| wsrep_connected | ON |
| wsrep_local_bf_aborts | 0 |
| wsrep_local_index | 1 |
| wsrep_provider_name | Galera |
| wsrep_provider_vendor | Codership Oy <[email protected]> |
| wsrep_provider_version | 3.5(rXXXX) |
| wsrep_ready | ON |
| wsrep_thread_count | 2 |
+------------------------------+----------------------------------------------------------+
48 rows in set (0.00 sec)
シーケンス番号が-1のgrastate.datは、実行中のノードでは問題ありません。
クラスターが正常に停止すると、シーケンス番号は各ノードの値に設定されます。次に、bootstrap最も進んだシーケンス番号を持つノードからのクラスターを作成する必要があります。