MySQL Bugs: #79207: relay_log_space_limit cannot be set to larget than 4GB with 64 bit mysql

Bug #79207	relay_log_space_limit cannot be set to larget than 4GB with 64 bit mysql
Submitted:	10 Nov 2015 14:54	Modified:	10 Nov 2015 17:56
Reporter:	Tim Smith	Email Updates:
Status:	Verified	Impact on me:	None
Category:	MySQL Server: Replication	Severity:	S3 (Non-critical)
Version:	5.6.27/5.7	OS:	Windows
Assigned to:		CPU Architecture:	Any

Description:
As title.

How to repeat:
If the relay_log_space_limit is set to greater than 4 GB in my.ini (i.e. relay_log_space_limit=107374182400), the mysqld can start without any error log about relay_log_space_limit settings. However, if we issue "show global variables like 'relay_log_space_limit'", it outputs the following.
+-----------------------+------------+
| Variable_name         | Value      |
+-----------------------+------------+
| relay_log_space_limit | 4294967295 |
+-----------------------+------------+
1 row in set (0.00 sec)

The result does not match what the manual describes at http://dev.mysql.com/doc/refman/5.6/en/replication-options-slave.html#option_mysqld_relay-... and means that mysqld auto shrink the value to 4 GB. If the manual is right, we can set the value up to 18446744073709551615.

Suggested fix:
Please let 64 bit mysqld can be set with relay_log_space_limit up to 18446744073709551615.

C:\dbs>5.6\bin\mysql -uroot -p
Enter password: ******
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.6.27-log MySQL Community Server (GPL)

Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> show global variables like 'relay_log_space_limit';
+-----------------------+------------+
| Variable_name         | Value      |
+-----------------------+------------+
| relay_log_space_limit | 4294967295 |
+-----------------------+------------+
1 row in set (0.00 sec)

mysql> SHOW VARIABLES LIKE "%VERSION%";
+-------------------------+------------------------------+
| Variable_name           | Value                        |
+-------------------------+------------------------------+
| innodb_version          | 5.6.27                       |
| protocol_version        | 10                           |
| slave_type_conversions  |                              |
| version                 | 5.6.27-log                   |
| version_comment         | MySQL Community Server (GPL) |
| version_compile_machine | x86_64                       |
| version_compile_os      | Win64                        |
+-------------------------+------------------------------+
7 rows in set (0.00 sec)

Thank you for the bug report. Below the warning on 5.7 log error file:

2015-11-10T17:16:42.732322Z 0 [Warning] option 'relay_log_space_limit': unsigned value 107374182400 adjusted to 4294967295