208708a58b
It is a thing: 2 nodes joining at the same time, with 2 JOINERs and 2 DONORs cluster-wide It can happen on operators with 2 garbd joining at the same time Before, pt-galera-log-explainer was using SST metadata naively. Basically if a node was DONOR and we found a "transfer completed" message, we assumed the donor name we found is the correct one. So for concurrent SSTs, donors were swapping names. Now, it is handled by a map, indexed by a donor name. To know if a node is actual donor or not, it now compare timestamps of events. It assumes both "selected donor" and "shifting DONOR" messages should have happen in less than 0.01 secs to avoid any conflict. Regression tests coming in next commit with an operator logs having concurrent SSTs. Another conflicts was sometimes breaking the test depending on the order on which we read files, hence why it's not added here yet
Percona Toolkit
Percona Toolkit is a collection of advanced command-line tools used by Percona support staff to perform a variety of MySQL and system tasks that are too difficult or complex to perform manually.
These tools are ideal alternatives to private or "one-off" scripts because they are professionally developed, formally tested, and fully documented. They are also fully self-contained, so installation is quick and easy and no libraries are installed.
Percona Toolkit is developed and supported by Percona Inc. For more information and other free, open-source software developed by Percona, visit http://www.percona.com/software/.
Installing
To install all tools, run:
perl Makefile.PL
make
make test
make install
You probably need to be root to make install. On most systems, the tools
are installed in /usr/local/bin. See the INSTALL file for more information.
Documentation
Run man percona-toolkit to see a list of installed tools, then man tool
to read the embedded documentation for a specific tool. You can also read
the documentation online at http://www.percona.com/software/percona-toolkit/.