kind

Specifies the spool storage backend type. This field is required. There is no default. The possible options are:

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

Warning

The "LocalDisk" kind is deprecated and will be removed in a future release. Defining a spool with it will log an error. Use "RocksDB" instead. Earlier versions allowed omitting kind and assumed that you meant LocalDisk. (Since: Dev Builds Only)

"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.