I did an ALTER TABLE on a huge table on a MariaDB Galera Cluster 10.2, but after a while of waiting I changed my mind and tried to kill the connection. However, MariaDB said ERROR 1095 (HY000): You are not owner of thread 123 even though I most definitely am the owner. So what is going on?

1 Answer 1


The error message is misleading. Galera can mark user threads as high priority which means they can't be killed. Currently, this gives the ERROR 1095 (HY000): You are not owner of thread... See MDEV-12008 for details.

This will probably affect other distributions of Galera as well, such as Percona XtraDB Cluster.

  • How did you end killing the query?
    – nbari
    Commented Apr 24, 2019 at 14:13
  • @nbari I couldn't, I waited until it finished.
    – dbdemon
    Commented Apr 24, 2019 at 15:28

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