def logger = Mock(Logger)

    def "only reports problems once"() {
        when:
        problemReporter.reportProblemIfNeeded(logger, InstallationLocation.userDefined(location, "source"), "message")
        problemReporter.reportProblemIfNeeded(logger, InstallationLocation.userDefined(location, "source"), "message")
        then:
        1 * logger.log(LogLevel.WARN, "message")
    }

    def "reports different problems"() {
        when:

					errs[idx] = err
				}
			}()

			userDefined := make(map[string]string, len(req.UserMetadata))
			for k, v := range req.UserMetadata {
				userDefined[k] = v
			}
			userDefined[xhttp.AmzObjectTagging] = s3utils.TagEncode(req.UserTags)

			if opts.Kind != nil {
				encrd, objectEncryptionKey, err := newEncryptReader(ctx, hr, opts.Kind, opts.KeyID, opts.Key, bucket, req.Key, userDefined, opts.KmsCtx)
				if err != nil {

		SSES3SinglePartObjects := make(map[int]bool)
		for i, object := range batch {
			if kind, ok := crypto.IsEncrypted(object.UserDefined); ok && kind == crypto.S3 && !crypto.IsMultiPart(object.UserDefined) {
				SSES3SinglePartObjects[i] = true

				metadata = append(metadata, object.UserDefined)
				buckets = append(buckets, object.Bucket)
				names = append(names, object.Name)
			}
		}

				if err != nil || (err == nil && ondiskTimestamp.Before(srcTimestamp)) {
					srcInfo.UserDefined[ReservedMetadataPrefixLower+TaggingTimestamp] = srcTimestamp.UTC().Format(time.RFC3339Nano)
					srcInfo.UserDefined[xhttp.AmzObjectTagging] = objTags
				}
			}
		} else {
			srcInfo.UserDefined[xhttp.AmzObjectTagging] = objTags
			srcInfo.UserDefined[ReservedMetadataPrefixLower+TaggingTimestamp] = UTCNow().Format(time.RFC3339Nano)
		}

					return
				}
			}
		case "UserDefined":
			var zb0003 uint32
			zb0003, bts, err = msgp.ReadMapHeaderBytes(bts)
			if err != nil {
				err = msgp.WrapError(err, "UserDefined")
				return
			}
			if z.UserDefined == nil {
				z.UserDefined = make(map[string]string, zb0003)
			} else if len(z.UserDefined) > 0 {
				for key := range z.UserDefined {
					delete(z.UserDefined, key)
				}

		ReplicationStatusInternal:  o.ReplicationStatusInternal,
		VersionPurgeStatusInternal: o.VersionPurgeStatusInternal,
	}
	cinfo.UserDefined = make(map[string]string, len(o.UserDefined))
	for k, v := range o.UserDefined {
		cinfo.UserDefined[k] = v
	}
	return cinfo
}

func (o ObjectInfo) tierStats() tierStats {
	ts := tierStats{
		TotalSize:   uint64(o.Size),
		NumVersions: 1,
	}

			return nil, err
		}
	}

	userDefined := cloneMSS(opts.UserDefined)
	if opts.PreserveETag != "" {
		userDefined["etag"] = opts.PreserveETag
	}
	onlineDisks := er.getDisks()

	// Get parity and data drive count based on storage class metadata
	parityDrives := globalStorageClass.GetParityForSC(userDefined[xhttp.AmzStorageClass])
	if parityDrives < 0 {

	_, isEncrypted := crypto.IsEncrypted(mi.UserDefined)
	_, replicationStatus := mi.UserDefined[xhttp.AmzBucketReplicationStatus]
	_, sourceReplReq := r.Header[xhttp.MinIOSourceReplicationRequest]
	var objectEncryptionKey crypto.ObjectKey
	if isEncrypted {
		if !crypto.SSEC.IsRequested(r.Header) && crypto.SSEC.IsEncrypted(mi.UserDefined) && !replicationStatus {

	if objInfo.DeleteMarker {
		return false
	}

	lhold := objectlock.GetObjectLegalHoldMeta(objInfo.UserDefined)
	if lhold.Status.Valid() && lhold.Status == objectlock.LegalHoldOn {
		return true
	}

	ret := objectlock.GetObjectRetentionMeta(objInfo.UserDefined)
	if ret.Mode.Valid() && (ret.Mode == objectlock.RetCompliance || ret.Mode == objectlock.RetGovernance) {
		t, err := objectlock.UTCNowNTP()

				}
			}
		}
		if ct.wantusrdef != 0 && ct.wantusrdef != *ct.d.(*userDefined) {
			errf("want userDefined %f, got %f", ct.wantusrdef, *ct.d.(*userDefined))
		}
		if len(ct.wantusrstr) != 0 && ct.wantusrstr != *ct.d.(*userDefinedString) {
			errf("want userDefined %q, got %q", ct.wantusrstr, *ct.d.(*userDefinedString))
		}
	}
}

func TestNullString(t *testing.T) {