func (r *ReplicationStats) Delete(bucket string) {
	if r == nil {
		return
	}

	r.Lock()
	defer r.Unlock()
	delete(r.Cache, bucket)
}

// UpdateReplicaStat updates in-memory replica statistics with new values.
func (r *ReplicationStats) UpdateReplicaStat(bucket string, n int64) {
	if r == nil {
		return
	}

	r.Lock()
	defer r.Unlock()
	bs, ok := r.Cache[bucket]
	if !ok {

    // NPE on null listener, so we propagate that contract up into the add method as well.
    checkNotNull(runnable, "Runnable was null.");
    checkNotNull(executor, "Executor was null.");

    // Lock while we check state. We must maintain the lock while adding the new pair so that
    // another thread can't run the list out from under us. We only add to the list if we have not
    // yet started execution.
    synchronized (this) {

	lock := z.serverPools[0].NewNSLock(minioMetaBucket, rebalMetaName)
	lkCtx, err := lock.GetLock(ctx, globalOperationTimeout)
	if err != nil {
		rebalanceLogIf(ctx, fmt.Errorf("failed to acquire write lock on %s/%s: %w", minioMetaBucket, rebalMetaName, err))
		return err
	}
	defer lock.Unlock(lkCtx)

	ctx = lkCtx.Context()

type IAMStorageAPI interface {
	// The role of the read-write lock is to prevent go routines from
	// concurrently reading and writing the IAM storage. The (r)lock()
	// functions return the iamCache. The cache can be safely written to
	// only when returned by `lock()`.
	lock() *iamCache
	unlock()
	rlock() *iamCache
	runlock()
	getUsersSysType() UsersSysType

		}
	case debugWaitForExit:
		c.reconnectMu.Lock()
		c.handleMsgWg.Wait()
		c.reconnectMu.Unlock()
	case debugSetConnPingDuration:
		c.connMu.Lock()
		defer c.connMu.Unlock()
		c.connPingInterval, _ = args[0].(time.Duration)
		if c.connPingInterval < time.Second {
			panic("CONN ping interval too low")
		}
	case debugSetClientPingDuration:
		c.connMu.Lock()
		defer c.connMu.Unlock()

	exit_1
fi

./mc mb --with-lock minio3/newbucket-olock
sleep 5

enabled_minio2=$(./mc stat --json minio2/newbucket-olock | jq -r .ObjectLock.enabled)
if [ $? -ne 0 ]; then
	echo "expected bucket to be mirrored with object-lock but not present, exiting..."
	exit_1
fi

if [ "${enabled_minio2}" != "Enabled" ]; then
	echo "expected bucket to be mirrored with object-lock enabled, exiting..."
	exit_1
fi

	registerPeerRESTHandlers(router, commonGrid)

	// Register bootstrap REST router for distributed setups.
	registerBootstrapRESTHandlers(commonGrid)

	// Register distributed namespace lock routers.
	registerLockRESTHandlers(lockGrid)

	// Add lock grid to router
	router.Handle(grid.RouteLockPath, adminMiddleware(lockGrid.Handler(storageServerRequestValidate), noGZFlag, noObjLayerFlag))

	// Add grid to router

}

func (t *tierMetrics) logSuccess(tier string) {
	t.Lock()
	defer t.Unlock()

	stat := t.requestsCount[tier]
	stat.success++
	t.requestsCount[tier] = stat
}

func (t *tierMetrics) logFailure(tier string) {
	t.Lock()
	defer t.Unlock()

	stat := t.requestsCount[tier]
	stat.failure++
	t.requestsCount[tier] = stat
}

	AmzCopySourceRange            = "X-Amz-Copy-Source-Range"
	AmzMetadataDirective          = "X-Amz-Metadata-Directive"
	AmzObjectLockMode             = "X-Amz-Object-Lock-Mode"
	AmzObjectLockRetainUntilDate  = "X-Amz-Object-Lock-Retain-Until-Date"
	AmzObjectLockLegalHold        = "X-Amz-Object-Lock-Legal-Hold"
	AmzObjectLockBypassGovernance = "X-Amz-Bypass-Governance-Retention"
	AmzBucketReplicationStatus    = "X-Amz-Replication-Status"

	if err != nil {
		t.Fatal(err)
	}

	erasureDisks := xl.getDisks()
	z.serverPools[0].erasureDisksMu.Lock()
	xl.getDisks = func() []StorageAPI {
		for i := range erasureDisks[:6] {
			erasureDisks[i] = newNaughtyDisk(erasureDisks[i], nil, errFaultyDisk)
		}
		return erasureDisks
	}