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If the config file contains
then the value of the status variable contains "a.index" rather than "a.b".
However, "a.b" is the index file that actually gets created.
Upstream bug report
http://bugs.mysql.com/103400
The root cause for this problem is that MySQL incorrectly processes the binlog and relay log names.
https://support.oracle.com/knowledge/Oracle%20Database%20Products/2454709_1.html
If the config file contains
then the value of the status variable contains "a.index" rather than "a.b".
However, "a.b" is the index file that actually gets created.