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MXS-2153: Update available_when_donor documentation

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Added a more precise description of what the parameter does, what the
accepted values are and where to get more information.
This commit is contained in:
Markus Mäkelä 2018-11-09 07:58:53 +02:00
parent 293d45aaf1
commit aadd6f38dc
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19
Documentation/Monitors/Galera-Monitor.md
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@ -51,11 +51,20 @@ disable_master_failback=true
### `available_when_donor`
This option only has an effect if there is a single Galera node being backed up
an XtraBackup instance. This causes the initial node to go into Donor state
which would normally prevent if from being marked as a valid server inside
MaxScale. If this option is enabled, a single node in Donor state where the
method is XtraBackup will be kept in Synced state.
This option allows Galera nodes to be used normally when they are donors in an
SST operation when the SST method is non-blocking
(e.g. `wsrep_sst_method=mariabackup`).
Normally when an SST is performed, both participating nodes lose their Synced,
Master or Slave statuses. When this option is enabled, the donor is treated as
if it was a normal member of the cluster (i.e. `wsrep_local_state = 4`). This is
especially useful if the cluster drops down to one node and an SST is required
to increase the cluster size.
The current list of non-blocking SST
methods are `xtrabackup`, `xtrabackup-v2` and `mariabackup`. Read the
[wsrep_sst_method](https://mariadb.com/kb/en/library/galera-cluster-system-variables/#wsrep_sst_method)
documentation for more details.
```
available_when_donor=true