[doc] wsrep_sst_donor can be overridden by IST preference

Bug #1401558 reported by Jay Janssen on 2014-12-11
This bug affects 1 person
Affects Status Importance Assigned to Milestone
Percona XtraDB Cluster moved to https://jira.percona.com/projects/PXC
Status tracked in 5.6
Fix Released
Alexey Zhebel

Bug Description

Newer versions of Galera take into account IST possibility when selecting a donor (by checking the gcache contents). I discovered that even if you select an explicit wsrep_sst_donor, Galera will still choose a different donor if our selection cannot IST.

This behavior could be arguably a bug, but either way we should document its behavior properly in the manual (it is not).

Tags: doc Edit Tag help

Yes, that has been the behavior since Galera 3.5 when smart donor selection was introduced. It applies to State transfer in general now, and so wsrep-sst-donor is also affected.

tags: added: doc
Alexey Zhebel (alexey-zhebel) wrote :

This page mentions that the wsrep-sst-donor variable takes both SST and IST into account: https://www.percona.com/doc/percona-xtradb-cluster/5.7/wsrep-system-index.html#wsrep_sst_donor

Percona now uses JIRA for bug reports so this bug report is migrated to: https://jira.percona.com/browse/PXC-1117

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