hcq/MaxScale
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

MXS-827: Add connection keepalive

Browse Source 
The readwritesplit now sends COM_PING queries to backend servers that have
been idle for too long. The option is configured with the
`connection_keepalive` parameter.
This commit is contained in:
Markus Mäkelä
2017-03-24 05:22:25 +02:00
parent e3bae59e1a
commit 710012ac5d
10 changed files with 125 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
Documentation/Routers/ReadWriteSplit.md
View File

@ -65,6 +65,22 @@ disable_sescmd_history=true
master_failure_mode=fail_on_write
```
### `connection_keepalive`
Send keepalive pings to backend servers. This feature was introduced in MaxScale
2.1.2 and is disabled by default.
The parameter value is the interval in seconds between each keepalive ping. A
keepalive ping will be sent to a backend server if the connection is idle and it
has not been used within `n` seconds where `n` is greater than or equal to the
value of _connection_keepalive_. The keepalive pings are only sent when the
client executes a query.
This functionality allows the readwritesplit module to keep all backend
connections alive even if they are not used. This is a common problem if the
backend servers have a low _wait_timeout_ value and the client connections live
for a long time.
## Router options
**`router_options`** may include multiple **readwritesplit**-specific options. All the options are parameter-value pairs. All parameters listed in this section must be configured as a value in `router_options`.