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migration-guide.md

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Migration guide

Libvalkey can replace both libraries hiredis and hiredis-cluster. This guide highlights which APIs that have changed and what you need to do when migrating to libvalkey.

The general actions needed are:

  • Replace the prefix redis with valkey in API usages.
  • Update include paths depending on your previous installation. All libvalkey headers are now found under include/valkey/.

Migrating from hiredis v1.2.0

The type sds is removed from the public API.

Removed API functions

  • redisFormatSdsCommandArgv removed from API. Can be replaced with valkeyFormatCommandArgv.
  • redisFreeSdsCommand removed since the sds type is for internal use only.

Migrating from hiredis-cluster 0.14.0

Renamed API functions

  • ctx_get_by_node is renamed to valkeyClusterGetValkeyContext.
  • actx_get_by_node is renamed to valkeyClusterGetValkeyAsyncContext.

Removed API functions

  • redisClusterSetMaxRedirect removed and replaced with valkeyClusterSetOptionMaxRetry.
  • redisClusterSetOptionConnectBlock removed since it was deprecated.
  • redisClusterSetOptionConnectNonBlock removed since it was deprecated.
  • parse_cluster_nodes removed from API, for internal use only.
  • parse_cluster_slots removed from API, for internal use only.

Removed support for splitting multi-key commands per slot

Since old days (from hiredis-vip) there has been support for sending some commands with multiple keys that covers multiple slots. The client would split the command into multiple commands and send to each node handling each slot. This was unnecessary complex and broke any expectations of atomicity. Commands affected are DEL, EXISTS, MGET and MSET.

Proposed action:

Partition the keys by slot using valkeyClusterGetSlotByKey before sending affected commands. Construct new commands when needed and send them using multiple calls to valkeyClusterCommand or equivalent.