为什么我在 MariaDB Galera Clutser 中收到此错误？

Question

我使用的是Galera Cluster，最近重启MariaDB时遇到如下错误，一共3个节点。 当只有第一个节点运行时，可以访问DB，但是当第二个节点执行时，会显示如下错误信息，并且没有形成集群。 为什么？

MariaDB 版本：10.4.20

mariadb | =====================================
mariadb | 2022-08-11 12:00:11 0x7f37339cf700 INNODB MONITOR OUTPUT
mariadb | =====================================
mariadb | Per second averages calculated from the last 60 seconds
mariadb | -----------------
mariadb | BACKGROUND THREAD
mariadb | -----------------
mariadb | srv_master_thread loops: 3 srv_active, 0 srv_shutdown, 74 srv_idle
mariadb | srv_master_thread log flush and writes: 76
mariadb | ----------
mariadb | SEMAPHORES
mariadb | ----------
mariadb | OS WAIT ARRAY INFO: reservation count 20
mariadb | --Thread 139884474328832 has waited at dict0dict.cc line 880 for 232.00 seconds the semaphore:
mariadb | Mutex at 0x556c68691100, Mutex DICT_SYS created dict0dict.cc:824, lock var 2
mariadb |
mariadb | --Thread 139874768164608 has waited at srv0srv.cc line 2011 for 242.00 seconds the semaphore:
mariadb | X-lock on RW-latch at 0x556c68691130 created in file dict0dict.cc line 833
mariadb | a writer (thread id 139875057460992) has reserved it in mode  exclusive
mariadb | number of readers 0, waiters flag 1, lock_word: 0
mariadb | Last time write locked in file dict0stats.cc line 2486
mariadb | OS WAIT ARRAY INFO: signal count 13
mariadb | RW-shared spins 19, rounds 487, OS waits 13
mariadb | RW-excl spins 17, rounds 103, OS waits 2
mariadb | RW-sx spins 0, rounds 0, OS waits 0
mariadb | Spin rounds per wait: 25.63 RW-shared, 6.06 RW-excl, 0.00 RW-sx
mariadb | ------------
mariadb | TRANSACTIONS
mariadb | ------------
mariadb | Trx id counter 2908999983
mariadb | Purge done for trx's n:o < 2908999981 undo n:o < 0 state: running but idle
mariadb | History list length 4
mariadb | LIST OF TRANSACTIONS FOR EACH SESSION:
mariadb | ---TRANSACTION 421359460385048, COMMITTED IN MEMORY flushing log
mariadb | 0 lock struct(s), heap size 1128, 0 row lock(s), undo log entries 2
mariadb | ---TRANSACTION 421359460380824, not started
mariadb | 0 lock struct(s), heap size 1128, 0 row lock(s)
mariadb | --------
mariadb | FILE I/O
mariadb | --------
mariadb | I/O thread 0 state: waiting for completed aio requests (insert buffer thread)
mariadb | I/O thread 1 state: waiting for completed aio requests (log thread)
mariadb | I/O thread 2 state: waiting for completed aio requests (read thread)
mariadb | I/O thread 3 state: waiting for completed aio requests (read thread)
mariadb | I/O thread 4 state: waiting for completed aio requests (read thread)
mariadb | I/O thread 5 state: waiting for completed aio requests (read thread)
mariadb | I/O thread 6 state: waiting for completed aio requests (write thread)
mariadb | I/O thread 7 state: waiting for completed aio requests (write thread)
mariadb | I/O thread 8 state: waiting for completed aio requests (write thread)
mariadb | I/O thread 9 state: waiting for completed aio requests (write thread)
mariadb | Pending normal aio reads: [0, 0, 0, 0] , aio writes: [0, 0, 0, 0] ,
mariadb |  ibuf aio reads:, log i/o's:, sync i/o's:
mariadb | Pending flushes (fsync) log: 0; buffer pool: 0
mariadb | 129125 OS file reads, 323 OS file writes, 57 OS fsyncs
mariadb | 0.00 reads/s, 0 avg bytes/read, 0.00 writes/s, 0.00 fsyncs/s
mariadb | -------------------------------------
mariadb | INSERT BUFFER AND ADAPTIVE HASH INDEX
mariadb | -------------------------------------
mariadb | Ibuf: size 1, free list len 4026, seg size 4028, 0 merges
mariadb | merged operations:
mariadb |  insert 0, delete mark 0, delete 0
mariadb | discarded operations:
mariadb |  insert 0, delete mark 0, delete 0
mariadb | Hash table size 2212699, node heap has 0 buffer(s)
mariadb | Hash table size 2212699, node heap has 0 buffer(s)
mariadb | Hash table size 2212699, node heap has 0 buffer(s)
mariadb | Hash table size 2212699, node heap has 0 buffer(s)
mariadb | Hash table size 2212699, node heap has 2 buffer(s)
mariadb | Hash table size 2212699, node heap has 2 buffer(s)
mariadb | Hash table size 2212699, node heap has 2 buffer(s)
mariadb | Hash table size 2212699, node heap has 3 buffer(s)
mariadb | 0.00 hash searches/s, 0.00 non-hash searches/s
mariadb | ---
mariadb | LOG
mariadb | ---
mariadb | Log sequence number 1202450201026
mariadb | Log flushed up to   1202450200636
mariadb | Pages flushed up to 1202450196728
mariadb | Last checkpoint at  1202450196719
mariadb | 1 pending log flushes, 0 pending chkp writes
mariadb | 35 log i/o's done, 0.00 log i/o's/second
mariadb | ----------------------
mariadb | BUFFER POOL AND MEMORY
mariadb | ----------------------
mariadb | Total large memory allocated 8606711808
mariadb | Dictionary memory allocated 407480
mariadb | Buffer pool size   513728
mariadb | Free buffers       384737
mariadb | Database pages     128982
mariadb | Old database pages 47768
mariadb | Modified db pages  136
mariadb | Percent of dirty pages(LRU & free pages): 0.026
mariadb | Max dirty pages percent: 75.000
mariadb | Pending reads 0
mariadb | Pending writes: LRU 0, flush list 20, single page 0
mariadb | Pages made young 0, not young 0
mariadb | 0.00 youngs/s, 0.00 non-youngs/s
mariadb | Pages read 128851, created 131, written 282
mariadb | 0.00 reads/s, 0.00 creates/s, 0.00 writes/s
mariadb | No buffer pool page gets since the last printout
mariadb | Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
mariadb | LRU len: 128982, unzip_LRU len: 0
mariadb | I/O sum[0]:cur[0], unzip sum[0]:cur[0]
mariadb | ----------------------
mariadb | INDIVIDUAL BUFFER POOL INFO
mariadb | ----------------------
mariadb | ---BUFFER POOL 0
mariadb | Buffer pool size   64216
mariadb | Free buffers       48110
mariadb | Database pages     16104
mariadb | Old database pages 5964
mariadb | Modified db pages  20
mariadb | Percent of dirty pages(LRU & free pages): 0.031
mariadb | Max dirty pages percent: 75.000
mariadb | Pending reads 0
mariadb | Pending writes: LRU 0, flush list 20, single page 0
mariadb | Pages made young 0, not young 0
mariadb | 0.00 youngs/s, 0.00 non-youngs/s
mariadb | Pages read 16100, created 4, written 31
mariadb | 0.00 reads/s, 0.00 creates/s, 0.00 writes/s
mariadb | No buffer pool page gets since the last printout
mariadb | Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
mariadb | LRU len: 16104, unzip_LRU len: 0
mariadb | I/O sum[0]:cur[0], unzip sum[0]:cur[0]
mariadb | ---BUFFER POOL 1
mariadb | Buffer pool size   64216
mariadb | Free buffers       48038
mariadb | Database pages     16177
mariadb | Old database pages 5991
mariadb | Modified db pages  5
mariadb | Percent of dirty pages(LRU & free pages): 0.008
mariadb | Max dirty pages percent: 75.000
mariadb | Pending reads 0
mariadb | Pending writes: LRU 0, flush list 0, single page 0
mariadb | Pages made young 0, not young 0
mariadb | 0.00 youngs/s, 0.00 non-youngs/s
mariadb | Pages read 16177, created 0, written 8
mariadb | 0.00 reads/s, 0.00 creates/s, 0.00 writes/s
mariadb | No buffer pool page gets since the last printout
mariadb | Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
mariadb | LRU len: 16177, unzip_LRU len: 0
mariadb | I/O sum[0]:cur[0], unzip sum[0]:cur[0]
mariadb | ---BUFFER POOL 2
mariadb | Buffer pool size   64216
mariadb | Free buffers       48125
mariadb | Database pages     16089
mariadb | Old database pages 5959
mariadb | Modified db pages  0
mariadb | Percent of dirty pages(LRU & free pages): 0.000
mariadb | Max dirty pages percent: 75.000
mariadb | Pending reads 0
mariadb | Pending writes: LRU 0, flush list 0, single page 0
mariadb | Pages made young 0, not young 0
mariadb | 0.00 youngs/s, 0.00 non-youngs/s
mariadb | Pages read 16089, created 0, written 0
mariadb | 0.00 reads/s, 0.00 creates/s, 0.00 writes/s
mariadb | No buffer pool page gets since the last printout
mariadb | Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
mariadb | LRU len: 16089, unzip_LRU len: 0
mariadb | I/O sum[0]:cur[0], unzip sum[0]:cur[0]
mariadb | ---BUFFER POOL 3
mariadb | Buffer pool size   64216
mariadb | Free buffers       48078
mariadb | Database pages     16137
mariadb | Old database pages 5976
mariadb | Modified db pages  64
mariadb | Percent of dirty pages(LRU & free pages): 0.100
mariadb | Max dirty pages percent: 75.000
mariadb | Pending reads 0
mariadb | Pending writes: LRU 0, flush list 0, single page 0
mariadb | Pages made young 0, not young 0
mariadb | 0.00 youngs/s, 0.00 non-youngs/s
mariadb | Pages read 16137, created 0, written 65
mariadb | 0.00 reads/s, 0.00 creates/s, 0.00 writes/s
mariadb | No buffer pool page gets since the last printout
mariadb | Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
mariadb | LRU len: 16137, unzip_LRU len: 0
mariadb | I/O sum[0]:cur[0], unzip sum[0]:cur[0]
mariadb | ---BUFFER POOL 4
mariadb | Buffer pool size   64216
mariadb | Free buffers       48092
mariadb | Database pages     16124
mariadb | Old database pages 5972
mariadb | Modified db pages  46
mariadb | Percent of dirty pages(LRU & free pages): 0.072
mariadb | Max dirty pages percent: 75.000
mariadb | Pending reads 0
mariadb | Pending writes: LRU 0, flush list 0, single page 0
mariadb | Pages made young 0, not young 0
mariadb | 0.00 youngs/s, 0.00 non-youngs/s
mariadb | Pages read 16124, created 0, written 46
mariadb | 0.00 reads/s, 0.00 creates/s, 0.00 writes/s
mariadb | No buffer pool page gets since the last printout
mariadb | Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
mariadb | LRU len: 16124, unzip_LRU len: 0
mariadb | I/O sum[0]:cur[0], unzip sum[0]:cur[0]
mariadb | ---BUFFER POOL 5
mariadb | Buffer pool size   64216
mariadb | Free buffers       48143
mariadb | Database pages     16071
mariadb | Old database pages 5952
mariadb | Modified db pages  1
mariadb | Percent of dirty pages(LRU & free pages): 0.002
mariadb | Max dirty pages percent: 75.000
mariadb | Pending reads 0
mariadb | Pending writes: LRU 0, flush list 0, single page 0
mariadb | Pages made young 0, not young 0
mariadb | 0.00 youngs/s, 0.00 non-youngs/s
mariadb | Pages read 16071, created 0, written 1
mariadb | 0.00 reads/s, 0.00 creates/s, 0.00 writes/s
mariadb | No buffer pool page gets since the last printout
mariadb | Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
mariadb | LRU len: 16071, unzip_LRU len: 0
mariadb | I/O sum[0]:cur[0], unzip sum[0]:cur[0]
mariadb | ---BUFFER POOL 6
mariadb | Buffer pool size   64216
mariadb | Free buffers       48087
mariadb | Database pages     16129
mariadb | Old database pages 5973
mariadb | Modified db pages  0
mariadb | Percent of dirty pages(LRU & free pages): 0.000
mariadb | Max dirty pages percent: 75.000
mariadb | Pending reads 0
mariadb | Pending writes: LRU 0, flush list 0, single page 0
mariadb | Pages made young 0, not young 0
mariadb | 0.00 youngs/s, 0.00 non-youngs/s
mariadb | Pages read 16066, created 63, written 63
mariadb | 0.00 reads/s, 0.00 creates/s, 0.00 writes/s
mariadb | No buffer pool page gets since the last printout
mariadb | Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
mariadb | LRU len: 16129, unzip_LRU len: 0
mariadb | I/O sum[0]:cur[0], unzip sum[0]:cur[0]
mariadb | ---BUFFER POOL 7
mariadb | Buffer pool size   64216
mariadb | Free buffers       48064
mariadb | Database pages     16151
mariadb | Old database pages 5981
mariadb | Modified db pages  0
mariadb | Percent of dirty pages(LRU & free pages): 0.000
mariadb | Max dirty pages percent: 75.000
mariadb | Pending reads 0
mariadb | Pending writes: LRU 0, flush list 0, single page 0
mariadb | Pages made young 0, not young 0
mariadb | 0.00 youngs/s, 0.00 non-youngs/s
mariadb | Pages read 16087, created 64, written 68
mariadb | 0.00 reads/s, 0.00 creates/s, 0.00 writes/s
mariadb | No buffer pool page gets since the last printout
mariadb | Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
mariadb | LRU len: 16151, unzip_LRU len: 0
mariadb | I/O sum[0]:cur[0], unzip sum[0]:cur[0]
mariadb | --------------
mariadb | ROW OPERATIONS
mariadb | --------------
mariadb | 0 queries inside InnoDB, 0 queries in queue
mariadb | 0 read views open inside InnoDB
mariadb | Process ID=1, Main thread ID=139874768164608, state: enforcing dict cache limit
mariadb | Number of rows inserted 0, updated 0, deleted 0, read 200
mariadb | 0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
mariadb | Number of system rows inserted 5, updated 0, deleted 4, read 9
mariadb | 0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
mariadb | ----------------------------
mariadb | END OF INNODB MONITOR OUTPUT
mariadb | ============================

Answer 1

好吧，不幸的是，您没有包含错误。 或者这就是它的样子。 您所包含的 output 没有任何异常 - 这是SHOW ENGINE INNODB STATUS; 命令，它公开了一些内部结构。 基于此，它表明您有一个相当未使用的服务器，流量非常有限。 有两个事务在运行，其中一个在某些行上被锁定。 InnoDB 缓冲池中仍然有空闲的 memory。 没有什么会指向任何问题。

一般来说，Galera 集群的问题可能是第二个节点没有正确加入集群。 除非所有节点都在“Primary”state，如SHOW STATUS LIKE 'wsrep_cluster_status'; 如果该节点不在主节点 state 中，您将无法对该节点运行查询（除非您设置wsrep_dirty_reads ，然后您可以运行SELECTs ，但那是另一回事了）。 这是为了确保您不会获得过时的读取（非主节点上的数据集已过时，因为它不是集群的一部分）。