# Automatic Site Replication

This feature allows multiple independent MinIO sites (or clusters) that are using the same external IDentity Provider (IDP) to be configured as replicas. In this situation the set of replica sites are referred to as peer sites or just sites. When site-replication is enabled on a set of sites, the following changes are replicated to all other sites:

- Creation and deletion of buckets and objects

	if !c.enabled {
		return info, nil
	}

	info.Enabled = true
	info.Name = c.state.Name
	info.Sites = make([]madmin.PeerInfo, 0, len(c.state.Peers))
	for _, peer := range c.state.Peers {
		info.Sites = append(info.Sites, peer)
	}
	sort.Slice(info.Sites, func(i, j int) bool {
		return info.Sites[i].Name < info.Sites[j].Name
	})

	info.ServiceAccountAccessKey = c.state.ServiceAccountAccessKey
	return info, nil
}

	if objectAPI == nil {
		return
	}

	var sites []madmin.PeerSite
	if err := parseJSONBody(ctx, r.Body, &sites, cred.SecretKey); err != nil {
		writeErrorResponseJSON(ctx, w, toAdminAPIErr(ctx, err), r.URL)
		return
	}

	opts := getSRAddOptions(r)
	status, err := globalSiteReplicationSys.AddPeerClusters(ctx, sites, opts)
	if err != nil {
		adminLogIf(ctx, err)

	}

	// Scale the number of connections from 32 -> 4 from small to large clusters.
	connectionsPerPeer := 3 + (29+len(clusterInfos.Sites)-1)/len(clusterInfos.Sites)

	errStr := ""
	var wg sync.WaitGroup

	for _, info := range clusterInfos.Sites {
		// skip self
		if globalDeploymentID() == info.DeploymentID {
			continue
		}
		info := info
		wg.Add(connectionsPerPeer)

failover occurs on `GET/HEAD` operations if object or object version requested qualifies for replication and is missing on one site, but present on the other. This allows the applications to take full advantage of two-way replication even before the two sites get fully synced.

In the case of multi destination replication, the replication status shows `COMPLETED` only after the replication operation succeeds on each of the targets specified in the replication configuration. If multiple targets are...

 * This form extends CreateForm to include fields necessary for updating existing web config entries,
 * including tracking information for optimistic locking and audit trails.
 * Web configs define how to crawl and index web sites and web applications.
 *
 */
public class EditForm extends CreateForm {

    /**
     * Creates a new EditForm instance.
     */
    public EditForm() {
        super();
    }

    /**

     * crawler may only retrieve Sitemaps that were modified since a certain
     * date. This incremental Sitemap fetching mechanism allows for the rapid
     * discovery of new URLs on very large sites.
     */
    private String lastmod;

    /**
     * Creates a new SitemapFile instance.
     */
    public SitemapFile() {
        // Default constructor
    }

    /*
     * (non-Javadoc)

    /**
     * The priority of this URL relative to other URLs on your site. Valid
     * values range from 0.0 to 1.0. This value does not affect how your pages
     * are compared to pages on other sites—it only lets the search engines know
     * which pages you deem most important for the crawlers.
     *
     * The default priority of a page is 0.5.
     *

		return errServerNotInitialized
	}
	info, err := globalSiteReplicationSys.GetClusterInfo(ctx)
	if err != nil {
		return err
	}
	if !info.Enabled {
		return nil
	}
	for _, peer := range info.Sites {
		if peer.DeploymentID == globalDeploymentID() {
			continue
		}
		rs, err := loadSiteResyncMetadata(ctx, objAPI, peer.DeploymentID)
		if err != nil {
			return err
		}
		sm.Lock()

replication_max_workers         (number)    set the maximum number of replication workers (default: '500')
replication_max_lrg_workers     (number)    set the maximum number of replication workers MinIO uses to replicate large objects between sites. (default: '10')
transition_workers              (number)    set the number of transition workers (default: '100')
stale_uploads_expiry            (duration)  set to expire stale multipart uploads older than this values (default: '24h')