Browse Definitions :
Definition

stateful app

A stateful app is a program that saves client data from the activities of one session for use in the next session. The data that is saved is called the application’s state.

Apps can be stateful or stateless. When an app is stateful, client data is either stored locally or on a remote host until the user logs out or the session expires after a predetermined time limit. The session data that is saved to persistent disk storage is accessible to the server, to the client and to other applications.

HTTP, on the other hand, is inherently stateless. A web server does not retain information from multiple sessions, so when a state is needed for a web app, it must be built in. If desired, stateful features can be built in with dynamic pages. These pages can retain sessions by way of web address variables and server- and client-side stored data. Cookies are a common way such data is stored.

Most desktop applications and operating systems are stateful. In the early days of cloud computing, however, developers were encouraged to build stateless apps, because stateful apps didn't scale well in the cloud's distributed, virtualized architecture. Limiting data stores to specific locations was difficult in an environment where virtual machines themselves were stateless; the result was that stateful apps moved straight to the cloud often became unstable.

Containerization may be changing that. This OS-level virtualization method for deploying and running distributed applications, without launching an entire VM for each application, allows files to be pulled into the container on startup, and persist somewhere else when containers stop and start. Google's Kubernetes 1.3, for example, adds support for stateful applications in a product called Pet Sets, which allows for hosts to be named and persist beyond container restarts. FlexVolume and Mesos also provide persistent volumes for containers' state data.

This was last updated in April 2018

Continue Reading About stateful app

SearchCompliance
  • OPSEC (operations security)

    OPSEC (operations security) is a security and risk management process and strategy that classifies information, then determines ...

  • smart contract

    A smart contract is a decentralized application that executes business logic in response to events.

  • compliance risk

    Compliance risk is an organization's potential exposure to legal penalties, financial forfeiture and material loss, resulting ...

SearchSecurity
  • buffer overflow

    A buffer overflow occurs when a program or process attempts to write more data to a fixed-length block of memory, or buffer, than...

  • biometric verification

    Biometric verification is any means by which a person can be uniquely identified by evaluating one or more distinguishing ...

  • password

    A password is a string of characters used to verify the identity of a user during the authentication process.

SearchHealthIT
SearchDisasterRecovery
  • What is risk mitigation?

    Risk mitigation is a strategy to prepare for and lessen the effects of threats faced by a business.

  • change control

    Change control is a systematic approach to managing all changes made to a product or system.

  • disaster recovery (DR)

    Disaster recovery (DR) is an organization's ability to respond to and recover from an event that affects business operations.

SearchStorage
  • What is RAID 6?

    RAID 6, also known as double-parity RAID, uses two parity stripes on each disk. It allows for two disk failures within the RAID ...

  • PCIe SSD (PCIe solid-state drive)

    A PCIe SSD (PCIe solid-state drive) is a high-speed expansion card that attaches a computer to its peripherals.

  • VRAM (video RAM)

    VRAM (video RAM) refers to any type of random access memory (RAM) specifically used to store image data for a computer display.

Close