WL#3940: Print changed positions etc to error log
Affects: Server-7.1 — Status: Un-Assigned — Priority: Medium
DESCRIPTION 1. Write new information and old position to error log so that users can see what hold before (and after) the change master command. James: "One fairly common error is to use the relay log number and position instead of the master binary log number and position when fixing a broken slave setup. Logging the master and relay log names and positions before and after CHANGE MASTER TO settings in the error log would be helpful when working out what has happened. The current log entries on shutdown and startup are already very helpful but not quite complete enough. For cases like some users, it would be good to have the slave write to the error log the master binary log name and position once an hour. Same for relay log name and position. We've seen cases where people seem to change the configuration files directly instead of using CHANGE MASTER TO. Sometimes by just copying the files from another slave." 2. Including the name of the slave server in the startup error log entry would be helpful for some support cases. 3. Logging free disk space on the drive holding the binary logs on startup, shutdown and in hourly status entries in the error log would be helpful. Related: BUG#43406
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