Disable causal reads with FTWRL + galera-info

Bug #1320441 reported by Raghavendra D Prabhu
This bug affects 2 people
Affects Status Importance Assigned to Milestone
Percona XtraBackup moved to https://jira.percona.com/projects/PXB
Fix Released
Alexey Kopytov
Fix Released
Alexey Kopytov
Fix Released
Alexey Kopytov

Bug Description

Reported based on the last comment here: https://bugs.launchpad.net/percona-xtradb-cluster/+bug/1271177/comments/6

This is required since otherwise, 'show status' blocks on FTWRL.

Note, it is still possible to do this in SST script with --init-connect of
innobackupex, however, for those who take backups, this will still cause

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tags: added: pwx
tags: added: pxc
removed: pwx
Revision history for this message
Alexey Kopytov (akopytov) wrote :

The fix is to run "set session wsrep-causal-reads=0" before executing FTWRL.

Revision history for this message
Raghavendra D Prabhu (raghavendra-prabhu) wrote :

Yes, that would be apt since status variables (required for xtrabackup galera
info) are queried after FTWRL.

Besides, since FTWRL is already in place, causality violation shouldn't matter since provider is paused at the time.

Revision history for this message
Shahriyar Rzayev (rzayev-sehriyar) wrote :

Percona now uses JIRA for bug reports so this bug report is migrated to: https://jira.percona.com/browse/PXB-405

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