How to verify if checkpoints are asynchronous or sync

[RKandoji]

Hi,

I'm using Flink 1.9, BlinkPlanner and rocksDB for backend with
checkpointing enabled.

I understand that checkpointing is async by default for RocksDB. But I'm
curious if there is way to verify if the checkpoints are happening
asynchronously or synchronously.

Please let me know.

Thanks,
RKandoji