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Add example to CCRFilter documentation

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The example has a filter configuration for a minimal setup. It also
describes how to tune the filter for greater performance.
This commit is contained in:
Markus Mäkelä 2017-02-08 14:46:52 +02:00
parent 1f9365f29b
commit 25c5e9ec9e
1 changed files with 21 additions and 0 deletions
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Documentation/Filters/CCRFilter.md
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@ -70,3 +70,24 @@ An optional parameter that can be used to control which statements don't trigger
the statement re-routing. This does the opposite of the _match_ parameter. The
parameter value is a regular expression that is used to match against the SQL
text. Only non-SELECT statements are inspected.
## Example Configuration
Here is a minimal filter configuration for the CCRFilter which should solve most
problems with critical reads after writes.
```
[CCRFilter]
type=filter
module=ccrfilter
time=5
```
This configuration will force all read queries after a write to the master for 5
seconds, preventing read scaling until the modifications have been replicated to
the slaves.
For best performance, the value of _time_ should be slightly greater than the
actual replication lag between the master and its slaves. If the number of
critical read statements is known, the _count_ parameter could be used to
control the number reads that are sent to the master.