iamUserPolicyMap:        xsync.NewMapOf[string, MappedPolicy](),
		iamSTSAccountsMap:       map[string]UserIdentity{},
		iamSTSPolicyMap:         xsync.NewMapOf[string, MappedPolicy](),
		iamGroupsMap:            map[string]GroupInfo{},
		iamUserGroupMemberships: map[string]set.StringSet{},
		iamGroupPolicyMap:       xsync.NewMapOf[string, MappedPolicy](),
	}
}

				writeErrorResponse(ctx, w, exportError(ctx, err, iamFile, ""), r.URL)
				return
			}
		case userPolicyMappingsFile:
			userPolicyMap := xsync.NewMapOf[string, MappedPolicy]()
			err := globalIAMSys.store.loadMappedPolicies(ctx, regUser, false, userPolicyMap)
			if err != nil {
				writeErrorResponse(ctx, w, exportError(ctx, err, iamFile, ""), r.URL)
				return

	purgeStart := time.Now()

	// Purge expired STS credentials.

	// Scan STS users on disk and purge expired ones.
	stsAccountsFromStore := map[string]UserIdentity{}
	stsAccPoliciesFromStore := xsync.NewMapOf[string, MappedPolicy]()
	for _, item := range listedConfigItems[stsListKey] {
		userName := path.Dir(item)
		// loadUser() will delete expired user during the load.

			time.Sleep(retry)
			attempt++
			continue
		}
		break
	}

	// initialize the incomplete uploads cache
	z.mpCache = xsync.NewMapOf[string, MultipartInfo]()

	go z.cleanupStaleMPCache(ctx)

	return z, nil
}

func (z *erasureServerPools) cleanupStaleMPCache(ctx context.Context) {