your deployment.

Even though this change is backward compatible we do not expect that it affects
the vast majority of deployments in any negative way.

> Will an upgrade of an existing MinIO cluster impact the SLA of the cluster or will it even cause downtime?

No, an upgrade should not cause any downtime. However, on the first startup -
since MinIO will attempt to migrate any existing IAM data - the boot process may

minio server /mnt/export
```

Testing with an example
> Obtaining client ID and secrets follow [Keycloak configuring documentation](https://github.com/minio/minio/blob/master/docs/sts/keycloak.md)

```
$ go run client-grants.go -cid PoEgXP6uVO45IsENRngDXj5Au5Ya -csec eKsw6z8CtOJVBtrOWvhRWL4TUCga

##### Credentials
{
 "accessKey": "NUIBORZYTV2HG2BMRSXR",

### Prerequisites

- [Configuring keycloak](https://github.com/minio/minio/blob/master/docs/sts/keycloak.md) or [Configuring Casdoor](https://github.com/minio/minio/blob/master/docs/sts/casdoor.md)
- [Configuring etcd](https://github.com/minio/minio/blob/master/docs/sts/etcd.md)

### Setup MinIO with Identity Provider

  - [Deployment based on MinIO Helm Chart](https://github.com/helm/charts/tree/master/stable/minio)

## **3. Configure Hadoop, Spark, Hive to use MinIO**

After successful installation navigate to the Ambari UI `http://<ambari-server>:8080/` and login using the default credentials: [**_username: admin, password: admin_**]

![ambari-login](https://github.com/minio/minio/blob/master/docs/bigdata/images/image3.png?raw=true "ambari login")

## License

- MinIO source is licensed under the [GNU AGPLv3](https://github.com/minio/minio/blob/master/LICENSE).
- MinIO [documentation](https://github.com/minio/minio/tree/master/docs) is licensed under [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/).

		cacheDuration = defaultCacheDuration
	}
	if cacheDuration < time.Second {
		logger.LogOnceIf(ctx, errors.New("cache duration is less than 1s, using default of 10s"), "refresh-kms-master-key")
		cacheDuration = defaultCacheDuration
	}
	timer := time.NewTimer(cacheDuration)
	defer timer.Stop()

	for {
		select {
		case <-ctx.Done():
			return
		case <-timer.C:

- Liveness probe available at `/minio/health/live`
- Cluster probe available at `/minio/health/cluster`

Read more on how to use these endpoints in [MinIO healthcheck guide](https://github.com/minio/minio/blob/master/docs/metrics/healthcheck/README.md).

## Prometheus Probe

To set up replication from a source bucket `srcbucket` on myminio cluster to a bucket `destbucket` on the target minio cluster with endpoint https://replica-endpoint:9000, use:
```

		targetID)
	auditTotalMessagesMD = NewCounterMD(auditTotalMessages,
		"Total number of messages sent since start",
		targetID)
)

// loadClusterAuditMetrics - `MetricsLoaderFn` for cluster audit
// such as failed messages and total messages.
func loadClusterAuditMetrics(_ context.Context, m MetricValues, c *metricsCache) error {
	audit := logger.CurrentStats()
	for id, st := range audit {

	EnvKESServerCA         = "MINIO_KMS_KES_CAPATH"         // Path to file/directory containing CA certificates to verify the KES server certificate
	EnvKESKeyCacheInterval = "MINIO_KMS_KEY_CACHE_INTERVAL" // Period between polls of the KES KMS Master Key cache, to prevent it from being unused and purged