Use latest bb8 and use Lifo as the queue strategy in the pool (#455)

* Use git bb8

* Use latest bb8 and change pool is use stack

Author: zainkabani

Cargo.lock

@@ -8,7 +8,7 @@ edition = "2021"
 tokio = { version = "1", features = ["full"] }
 bytes = "1"
 md-5 = "0.10"
-bb8 = "0.8.0"
+bb8 = { git = "https://github.com/djc/bb8.git", rev = "ad653e0" } # https://github.com/djc/bb8/commit/ad653e021607eb1f90ed6ce554d1766920308ffa
 async-trait = "0.1"
 rand = "0.8"
 chrono = "0.4"

Cargo.toml

@@ -1,6 +1,6 @@
 use arc_swap::ArcSwap;
 use async_trait::async_trait;
-use bb8::{ManageConnection, Pool, PooledConnection};
+use bb8::{ManageConnection, Pool, PooledConnection, QueueStrategy};
 use bytes::{BufMut, BytesMut};
 use chrono::naive::NaiveDateTime;
 use log::{debug, error, info, warn};
@@ -401,6 +401,7 @@ impl ConnectionPool {
                             .idle_timeout(Some(std::time::Duration::from_millis(idle_timeout)))
                             .max_lifetime(Some(std::time::Duration::from_millis(server_lifetime)))
                             .reaper_rate(std::time::Duration::from_millis(reaper_rate))
+                            .queue_strategy(QueueStrategy::Lifo)
                             .test_on_check_out(false);
 
                         let pool = if config.general.validate_config {