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Set MaxIdleConns to reduce connection churn (postgresql physical) (#6967)

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* Set MaxIdleConns to reduce connection churn (postgresql physical)

* Make new  "max_idle_connection" config option for physical postgresql

* Add docs for "max_idle_connections" for postgresql storage

* Add minimum version to docs for max_idle_connections
This commit is contained in:
Garrett T
2019-07-02 18:03:56 -04:00
committed by Brian Kassouf
parent 628ccce65e
commit 8f6d2002f8
3 changed files with 36 additions and 0 deletions
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16
physical/postgresql/postgresql.go
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@@ -114,6 +114,18 @@ func NewPostgreSQLBackend(conf map[string]string, logger log.Logger) (physical.B
maxParInt = physical.DefaultParallelOperations
}
maxIdleConnsStr, maxIdleConnsIsSet := conf["max_idle_connections"]
var maxIdleConns int
if maxIdleConnsIsSet {
maxIdleConns, err = strconv.Atoi(maxIdleConnsStr)
if err != nil {
return nil, errwrap.Wrapf("failed parsing max_idle_connections parameter: {{err}}", err)
}
if logger.IsDebug() {
logger.Debug("max_idle_connections set", "max_idle_connections", maxIdleConnsStr)
}
}
// Create PostgreSQL handle for the database.
db, err := sql.Open("postgres", connURL)
if err != nil {
@@ -121,6 +133,10 @@ func NewPostgreSQLBackend(conf map[string]string, logger log.Logger) (physical.B
}
db.SetMaxOpenConns(maxParInt)
if maxIdleConnsIsSet {
db.SetMaxIdleConns(maxIdleConns)
}
// Determine if we should use a function to work around lack of upsert (versions < 9.5)
var upsertAvailable bool
upsertAvailableQuery := "SELECT current_setting('server_version_num')::int >= 90500"