Function Specifications

When used as a Flink state backend, OmniStateStore and RocksDB both support core functions such as basic state read/write, checkpoints, and savepoints, providing a reference for evaluating the feasibility of replacing RocksDB with OmniStateStore.

Table 1 describes the comparison between RocksDB and OmniStateStore.

**Table 1** State backend comparison
Item	Function	RocksDB State Backend	OmniStateStore State Backend
Basic status read and write APIs	Operator state	Supported	Supported
	Broadcast state	Supported	Supported
	Value state	Supported	Supported
	List state	Supported	Supported
	Map state	Supported	Supported
	Reducing state	Supported	Supported
	Aggregating state	Supported	Supported
	Time to live (TTL)	Supported	Supported
	Timer	Supported	Supported
Checkpoint	Full snapshot	Supported	Supported
	Incremental snapshot	Supported	Supported
	Aligned snapshot	Supported	Supported
	Non-aligned snapshot	Supported	Supported
	Common snapshot restoration	Supported	Supported
	Snapshot restoration in scenarios with scaling parallelism	Supported	Supported
Savepoint	Hitless savepoint	Supported	Supported
	Blocking savepoint	Supported	Supported
	Standard savepoint	Supported	Supported
	Native savepoint	Supported	Supported
	Savepoint release	Supported	Supported
	Common savepoint restoration	Supported	Supported
	Savepoint restoration in scenarios with scaling parallelism	Supported	Supported
	Status data structure upgrade with savepoints	Supported	Supported

Parent topic: References