*: Fix the setting method of innodb_buffer_pool_instances parameter and change podSpec.Resources name. #244

[runkecheng]

What type of PR is this?

/enhancement

Which issue(s) this PR fixes?

Fixes #244

What this PR does?

Summary:

• PodSpec.Resources ->PodPolicy.defaultResources
• The method of calculating innodb_buffer_pool_instances is changed from using podSpec.Resources to using mysqlOpts.Resources

Special notes for your reviewer?

[runkecheng]

after modification:

    Resources:
      Limits:
        Cpu:     4000m
        Memory:  8Gi
      Requests:
        Cpu:        2000m
        Memory:     4Gi

• innodb_buffer_pool_instances should be 2. √
• innodb_buffer_pool_size should be 2.5G(it must be an integer multiple of innodb_buffer_pool_chunk_size * innodb_buffer_pool_instances). √

mysql> SHOW VARIABLES LIKE 'innodb_buffer_pool_%';
+-------------------------------------+----------------+
| Variable_name                       | Value          |
+-------------------------------------+----------------+
| innodb_buffer_pool_instances        | 2              |
| innodb_buffer_pool_size             | 2684354560     |
+-------------------------------------+----------------+
11 rows in set (0.01 sec)

[acekingke]

LGTM

[hustjieke]

LGTM.

[andyli029]

LGTM.