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P4 Server Administration Documentation | 2025.2

# What’s new in P4 Server administration in 2022.2

Released: May 2021

For a complete list of what’s new in this release, see the Release notes and What’s new in the Helix Core Command-Line (P4) Reference.

## Parallel checkpointing

Support for Parallel checkpointing, dumping, and recovery.

## Triggers

- Support for failback triggers and extensions. See Triggering on failed-back.

- Server triggers can use `%serverprocesspid%` for the process to complement `%serverpid%` for the thread. See Trigger script variables.

- A unique command identifier. See `%commandIdent%` in Trigger script variables (and Server extension session variables).

- Triggers can use the `%maxOpenFiles%` variable. See Trigger script variables (and Server extension session variables).

## Structure logging

- Server log files now include an estimate of the memory used by a command. See "command-end" in Structured Log Events.

- A command group identifier that clients can use to tie multiple events to a single action for improved traceability. Requires using version `55` of the structured log schema. See Protocol for server and clients by release and Using structured logging.

- Server log support for tracking network stats for upstream server-to-server communication as well as with the client or downstream server. These stats are recorded as additional 'NetworkPerformance' events in the structured logs at version 55 (8.55). See `track-rpc` under Structured Log Events and the examples and explanations at Server-to-server network usage on replicas.

## Additional enhancements

- On Windows Server 2016 and newer, journal rotation can be performed using an atomic rename instead of a copy and truncate operation. To enable this feature, see the `filesys.atomic.rename` configurable in the P4 CLI Reference.

- The `-jr` recovery command to p4d supports recalculating the net storage reference count change from the revision records. See `-S` under Journal restore options and the associated "Important" note.

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