Disable causal reads with FTWRL + galera-info

Bug #1320441 reported by Raghavendra D Prabhu on 2014-05-17
14
This bug affects 2 people
Affects Status Importance Assigned to Milestone
Percona XtraBackup
High
Alexey Kopytov
2.1
High
Alexey Kopytov
2.2
High
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
issues.

Tags: pxc Edit Tag help

Related branches

lp:~akopytov/percona-xtrabackup/bug1320441-2.1
Merged into lp:percona-xtrabackup/2.1 at revision 749
Alexey Kopytov (community): Approve on 2014-06-05
tags: added: pwx
tags: added: pxc
removed: pwx
Alexey Kopytov (akopytov) wrote :

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

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.

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