MySQL Bugs: #40023: End the uncertainty on replication compatability

Bug #40023	End the uncertainty on replication compatability
Submitted:	14 Oct 2008 15:07	Modified:	26 Oct 2008 1:38
Reporter:	Chris Calender	Email Updates:
Status:	Closed	Impact on me:	None
Category:	MySQL Server: Documentation	Severity:	S4 (Feature request)
Version:	All	OS:	Any
Assigned to:	Jon Stephens	CPU Architecture:	Any
Tags:	incompatibility, replication, replication compatibility

Description:
End the uncertainty on replication compatability (feature request)

For an Enterprise RDBMS, replication from the previous stable version to the new stable version must always work. Note that the claim is 'must' rather than 'should' or 'generally'. Fear sets in when I read the sections in the MySQL manual.

There is too much uncertainty:
http://dev.mysql.com/doc/refman/5.1/en/replication-compatibility.html
http://dev.mysql.com/doc/refman/5.1/en/replication-features.html

My favorite paragraph follows.
"If you are planning to use replication between 5.1 and a previous version of MySQL you should consult the edition of the MySQL Reference Manual corresponding to the earlier release series for information regarding the replication characteristics of that series."

http://mysqlha.blogspot.com/2008/10/faith-based-upgrades.html

How to repeat:
N/A

Suggested fix:
N/A

This should have been filed as a Docs bug, rather than Server:Replication.

Updating category and lead, setting priority as P2, and assigning to myself.

Fix, Part I: Rewrite of replication-compatibility: http://lists.mysql.com/commits/56639

Phase 2 - overhaul of replication-features: http://lists.mysql.com/commits/57059