There appears to be an undocumented change from 3.23.49 to 3.23.51,
possibly for the worse.
Consider two sessions executing the following sequence of commands on an
innodb table (assume maximum ACID properties):
session 1> begin;
session 1> update table set field = field + 1 where primary_key = 1;
session 2> select * from table where primary_key = 1;
In version 3.23.49, session 2 returns a row relatively quickly. In
version 3.23.51, session 2 blocks. The 3.23.49 behavior is reasonable
-- the 2nd session is not required to block because the database is
allowed to choose an ordering of transactions when transactions are
concurrent and it is reasonable to choose the order where session 2
completes before session 1.
So, it appears that version 3.23.51 has different behavior and I don't
see this documented in the list of changes. And it could be argued that
the 3.23.49 behavior was better.
[fyi... one other undocumented change would be the change to the client
libraries so that when an application tries to parse a group out of a
configuration file, there won't be a core dump. I think this was a bug
fix to libmysql.c, adding a '*' to the statement 'for (end= *option ;
*(end= strcend(end,'_')) ; )'.]
chuck
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