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Recovering from a high availability system crash


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The Pega Platform provides crash recovery for browser and servers. With crash recovery enabled, the Pega Platform saves the structure of the user interface and relevant work metadata to the database on user interface events.

The following matrix details the events that occur if a browser, Pega Platform server, or machine crashes.

Events Browser crash Pega Platform server crash
Pega Platform application user interface is redrawn Yes Yes
User must re-authenticate
  • No, if redirected to the same Pega Platform server
  • Yes, if authentication cookie was lost
  • No, with single sign-on
  • Yes, without single sign-on
Data entry loss
  • No, if redirected to the same Pega Platform server
  • Data not committed is lost if authentication cookie was lost
Data not committed is lost

Additionally, after a crash event, users must:

  • Reacquire work object locks.
  • Manually reopen assignments.
  • Recovering from a server crash

    Pega Platform server failover occurs when you have enabled periodic work recording to shared storage and the Pega Platform server that fails is taken out of service from the load balancer.

  • Recovering from a browser crash

    Browser crash recovery is provided as a part of the Pega Platform. The state of a Pega Platform application is recovered without loss. The clipboard preserves both metadata for the user interface and any data entered on screens and submitted.

  • Enabling crash notification

    You can configure Pega Platform to display a message to users in the event of a server or browser crash.

  • Enabling periodic work recording

    To recover from server or browser crashes, you can configure Pega Platform to periodically record work in progress. When configured in this way, the system saves metadata about the state of user interface interactions, tabs, and screens, and restores the UI state to the last persisted state after a crash.

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