Housekeeping

Intervall and Time Budget

Housekeeping interval and time budget is configured by setting up a StorageHousekeepingController.

Available properties are:

EmbeddedStorageManager storage = EmbeddedStorage.Foundation(
Storage.ConfigurationBuilder()
.setHousekeepingController(Storage.HousekeepingController(1000, 10_000_000))
.createConfiguration())
.start();

File Sizes and Payload

The desired file min and max sizes and payload ratio is configured by the StorageDataFileEvaluator:

available properties are:

  • Data file minimum size Files smaller then minimum file size will be merged with other files if possible, default is 1 MB.

  • Data file maximum size Files larger then maximum file size will be split in smaller ones, default is 8 MB.

  • Data file dissolve ratio Data file payload min ratio to trigger file refactoring, default is 0.75 (75%).

EmbeddedStorageManager storage = EmbeddedStorage.Foundation(
Storage.ConfigurationBuilder()
.setFileEvaluator(Storage.DataFileEvaluator(1024*1024, 1024*1024*8, 0.75))
.createConfiguration())
.start();

Cache

The lifetime of objects in the internal entity cache can be configured by the StorageEntityCacheEvaluator:

Available properties are:

  • Entity cache threshold

    Abstract threshold value, roughly comparable to size in bytes with a time component, at which a cache must be cleared of some entities. Default is 1000000000.

  • Entity cache timeout Time in milliseconds after that an entity is considered to be old if not read meanwhile. must be greater zero, default is 86400000ms (1 day).

EmbeddedStorageManager storage = EmbeddedStorage.Foundation(
Storage.ConfigurationBuilder()
.setEntityCacheEvaluator(Storage.EntityCacheEvaluator(
86_400_000,
1_000_000_000))
.createConfiguration())
.start();

For external configuration see: Properties