MySQL挂在带有blob字段的表中的SELECT上

如何解决MySQL挂在带有blob字段的表中的SELECT上

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我设法创建了一个包含三个节点和一个路由器的 MysqL InnoDB 集群，一切正常，但是当我尝试从另一台服务器运行下表中的选择查询时，它会冻结，但是当我将结果限制为26岁以下的人数

SET NAMES utf8;
SET time_zone = '+00:00';

SET NAMES utf8mb4;

DROP TABLE IF EXISTS `v7_addad`;
CREATE TABLE `v7_addad` (
  `id` int NOT NULL AUTO_INCREMENT,`body` text CHaraCTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL,`page_id` int NOT NULL,`done` tinyint NOT NULL DEFAULT '0',`book` varchar(255) CHaraCTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL,PRIMARY KEY (`id`),FULLTEXT KEY `body` (`body`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci;

例如：

select * from v7_addad limit 25; # this works
select * from v7_addad limit 26; # this freezes

顺便说一句，如果从 R/W 节点（托管主模式的服务器）尝试时没有冻结。

show engine innodb status;

=====================================
2021-01-02 15:49:26 0x7f8584324700 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 11 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 35520 srv_active,0 srv_shutdown,135529 srv_idle
srv_master_thread log flush and writes: 0
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 398
OS WAIT ARRAY INFO: signal count 589
RW-shared spins 269,rounds 269,OS waits 0
RW-excl spins 145,rounds 4321,OS waits 134
RW-sx spins 1,rounds 1,OS waits 0
Spin rounds per wait: 1.00 RW-shared,29.80 RW-excl,1.00 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 207413
Purge done for trx's n:o < 207412 undo n:o < 0 state: running but idle
History list length 12
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421696252934904,not started
0 lock struct(s),heap size 1136,0 row lock(s)
---TRANSACTION 421696252933192,0 row lock(s)
---TRANSACTION 421696252934048,0 row lock(s)
---TRANSACTION 421696252932336,0 row lock(s)
---TRANSACTION 421696252931480,0 row lock(s)
---TRANSACTION 421696252930624,0 row lock(s)
---TRANSACTION 421696252929768,0 row lock(s)
--------
FILE I/O
--------
I/O thread 0 state: waiting for completed aio requests (insert buffer thread)
I/O thread 1 state: waiting for completed aio requests (log thread)
I/O thread 2 state: waiting for completed aio requests (read thread)
I/O thread 3 state: waiting for completed aio requests (read thread)
I/O thread 4 state: waiting for completed aio requests (read thread)
I/O thread 5 state: waiting for completed aio requests (read thread)
I/O thread 6 state: waiting for completed aio requests (write thread)
I/O thread 7 state: waiting for completed aio requests (write thread)
I/O thread 8 state: waiting for completed aio requests (write thread)
I/O thread 9 state: waiting for completed aio requests (write thread)
Pending normal aio reads: [0,0],aio writes: [0,ibuf aio reads:,log I/O's:,sync I/O's:
Pending flushes (fsync) log: 0; buffer pool: 18446744073709551589
5225 OS file reads,765431 OS file writes,599449 OS fsyncs
0.00 reads/s,0 avg bytes/read,2.91 writes/s,2.45 fsyncs/s
-------------------------------------
INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1,free list len 0,seg size 2,0 merges
merged operations:
 insert 0,delete mark 0,delete 0
discarded operations:
 insert 0,delete 0
Hash table size 3984439,node heap has 2 buffer(s)
Hash table size 3984439,node heap has 1 buffer(s)
Hash table size 3984439,node heap has 3 buffer(s)
Hash table size 3984439,node heap has 4 buffer(s)
Hash table size 3984439,node heap has 7 buffer(s)
0.18 hash searches/s,1.55 non-hash searches/s
---
LOG
---
Log sequence number          2237873266
Log buffer assigned up to    2237873266
Log buffer completed up to   2237873266
Log written up to            2237873266
Log flushed up to            2237873266
Added dirty pages up to      2237873266
Pages flushed up to          2237873266
Last checkpoint at           2237873266
247265 log I/O's done,1.18 log I/O's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 16483614720
Dictionary memory allocated 1956558
Buffer pool size   983040
Free buffers       977601
Database pages     5418
Old database pages 2027
Modified db pages  0
Pending reads      0
Pending writes: LRU 0,flush list 0,single page 0
Pages made young 0,not young 0
0.00 youngs/s,0.00 non-youngs/s
Pages read 5153,created 265,written 361560
0.00 reads/s,0.00 creates/s,0.00 writes/s
Buffer pool hit rate 1000 / 1000,young-making rate 0 / 1000 not 0 / 1000
Pages read ahead 0.00/s,evicted without access 0.00/s,Random read ahead 0.00/s
LRU len: 5418,unzip_LRU len: 0
I/O sum[0]:cur[0],unzip sum[0]:cur[0]
----------------------
INDIVIDUAL BUFFER POOL INFO
----------------------
---BUFFER POOL 0
Buffer pool size   491520
Free buffers       488755
Database pages     2754
Old database pages 1026
Modified db pages  0
Pending reads      0
Pending writes: LRU 0,0.00 non-youngs/s
Pages read 2596,created 158,written 229420
0.00 reads/s,Random read ahead 0.00/s
LRU len: 2754,unzip sum[0]:cur[0]
---BUFFER POOL 1
Buffer pool size   491520
Free buffers       488846
Database pages     2664
Old database pages 1001
Modified db pages  0
Pending reads      0
Pending writes: LRU 0,0.00 non-youngs/s
Pages read 2557,created 107,written 132140
0.00 reads/s,Random read ahead 0.00/s
LRU len: 2664,unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB,0 queries in queue
0 read views open inside InnoDB
Process ID=3803,Main thread ID=140203552966400,state=sleeping
Number of rows inserted 0,updated 33674,deleted 0,read 5195822
0.00 inserts/s,0.18 updates/s,0.00 deletes/s,15.91 reads/s
Number of system rows inserted 33706,updated 1120,deleted 33702,read 85994
0.18 inserts/s,0.00 updates/s,0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================