kind

Specifies the spool storage backend type. There are two possible options:

• "LocalDisk" - the default. Stores data in individual files on the filesystem.
• "RocksDB" - uses RocksDB to achieve higher throughput.

"LocalDisk"'s performance characteristics are strongly coupled with your local storage device and filesystem performance.

"RocksDB" makes heavy use of memory buffers and intelligent layout of storage to reduce the I/O cost. To a certain degree, the buffering has similar characteristics to deferred spooling, but the risk of corruption is attenuated because RocksDB uses a write-ahead-log and a background sync thread.