Comment 14 for bug 1220579

Couple of related bug reports were fixed since then, like:
https://bugs.launchpad.net/percona-toolkit/+bug/1217466
https://bugs.launchpad.net/percona-toolkit/+bug/1399789

I also double checked with latest toolkit and all works as expected to me:

[root@percona3 ~]# pt-table-checksum --recursion-method=cluster --databases=test --tables a,b
Not checking replica lag on percona2 because it is a cluster node.
Not checking replica lag on percona1 because it is a cluster node.
            TS ERRORS DIFFS ROWS CHUNKS SKIPPED TIME TABLE
10-31T12:28:04 0 0 3 1 0 0.072 test.a
10-31T12:28:04 0 0 3 1 0 0.057 test.b
[root@percona3 ~]# pt-table-checksum --version
pt-table-checksum 3.0.4

[root@percona3 ~]# mysql -E -e "select @@version,@@version_comment"
*************************** 1. row ***************************
        @@version: 5.7.18-15-57
@@version_comment: Percona XtraDB Cluster (GPL), Release rel15, Revision 7693d6e, WSREP version 29.20, wsrep_29.20

Tested also against PXC 5.6.36