BatchOperation: try to emit drain event when trying emit end event and actually it's not ended to make sure it won't 'hang'
BatchOperation: try to emit drain event when trying emit end event and actually it's not ended to make sure it won't 'hang'

Azure/azure-storage-node,XiaoningLiu/azure-storage-node,XiaoningLiu/azure-storage-node,yaxia/azure-storage-node,Azure/azure-storage-node