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Adjust table_open_cache to avoid getting error 24 (too many open files)

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MDEV--15609 engines/funcs.crash_manytables_number crashes with error 24
           (too many open files)
MDEV-10286  Adjustment of table_open_cache according to system limits
            does not work when open-files-limit option is provided

Fixed by adjusting tc_size downwards if there is not enough file
descriptors to use.

Other changes:
- Ensure that there is 30 (was 10) extra file descriptors for other usage
- Decrease TABLE_OPEN_CACHE_MIN to 200 as it's better to have a smaller
  table cache than getting error 24
- Increase minimum of max_connections and table_open_cache from 1 to 10
  as 1 is not usable for any real application, only for testing.
This commit is contained in:
Monty
2018-03-22 20:03:54 +02:00
parent 4d83b01537
commit ca0c96fc89
29 changed files with 193 additions and 85 deletions
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20
mysql-test/suite/sys_vars/r/max_connections_basic.result
View File

@ -27,20 +27,24 @@ SELECT @@global.max_connections;
@@global.max_connections
65536
SET @@global.max_connections = 1;
Warnings:
Warning 1292 Truncated incorrect max_connections value: '1'
SELECT @@global.max_connections;
@@global.max_connections
1
10
SET @@global.max_connections = 2;
Warnings:
Warning 1292 Truncated incorrect max_connections value: '2'
SELECT @@global.max_connections;
@@global.max_connections
2
10
'#--------------------FN_DYNVARS_074_04-------------------------#'
SET @@global.max_connections = -1;
Warnings:
Warning 1292 Truncated incorrect max_connections value: '-1'
SELECT @@global.max_connections;
@@global.max_connections
1
10
SET @@global.max_connections = 100000000000;
Warnings:
Warning 1292 Truncated incorrect max_connections value: '100000000000'
@ -57,13 +61,13 @@ Warnings:
Warning 1292 Truncated incorrect max_connections value: '-1024'
SELECT @@global.max_connections;
@@global.max_connections
1
10
SET @@global.max_connections = 0;
Warnings:
Warning 1292 Truncated incorrect max_connections value: '0'
SELECT @@global.max_connections;
@@global.max_connections
1
10
SET @@global.max_connections = 100001;
Warnings:
Warning 1292 Truncated incorrect max_connections value: '100001'
@ -98,15 +102,17 @@ WHERE VARIABLE_NAME='max_connections';
1
'#---------------------FN_DYNVARS_074_07----------------------#'
SET @@global.max_connections = TRUE;
Warnings:
Warning 1292 Truncated incorrect max_connections value: '1'
SELECT @@global.max_connections;
@@global.max_connections
1
10
SET @@global.max_connections = FALSE;
Warnings:
Warning 1292 Truncated incorrect max_connections value: '0'
SELECT @@global.max_connections;
@@global.max_connections
1
10
'#---------------------FN_DYNVARS_074_08----------------------#'
SET @@global.max_connections = 5000;
SELECT @@max_connections = @@global.max_connections;