quantranhong1999 commented on code in PR #1671:
URL: https://github.com/apache/james-project/pull/1671#discussion_r1296645690


##########
server/mailet/rate-limiter-redis/src/main/scala/org/apache/james/rate/limiter/redis/RedisHealthCheck.scala:
##########
@@ -47,16 +49,18 @@ class RedisHealthCheck @Inject()(redisConfiguration: 
RedisRateLimiterConfigurati
     if (redisConfiguration.isCluster) {
       val redisUris = redisConfiguration.redisURI.value.asJava
       redisUris.forEach(redisUri => redisUri.setTimeout(healthcheckTimeout))
+      val redisClusterClient = RedisClusterClient.create(redisUris)
 
-      SMono.fromPublisher(Mono.using(() => 
RedisClusterClient.create(redisUris),
-        (redisClusterClient: RedisClusterClient) => Mono.fromCallable(() => 
redisClusterClient.connect()),
-        (redisClusterClient: RedisClusterClient) => 
redisClusterClient.close()))
+      
SMono.fromFuture(redisClusterClient.connectAsync(StringCodec.UTF8).asScala)
+        .doOnNext(redisConnection => redisConnection.closeAsync())
+        .doOnTerminate(() => redisClusterClient.close())

Review Comment:
   Which ones do you mean?
   
   `redisClusterClient.connectAsync `+ `redisConnection.closeAsync` -> non 
blocking
   `redisClusterClient.close()` -> release Java objects, should be fast enough.



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