Comments - Galera cluster fail during dump or optimize
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Yes, that was the issue. Thank you very much :)
I've added the suggested wsrep_provider_options from blog of Jay Janssen: gcs.fc_limit=500; gcs.fc_master_slave=YES; gcs.fc_factor=1.0";
Which resolved the problem. However it also created a new problem, the job now finishes correctly but after that the cluster still go's down.