Cyclic initialization & deinitilization of persistent.Map cause memory leak

[hicolour]

In a single application life cycle I have a need to use multiple times fresh instance of persistence map to reduce pressure on memory.

    val map = {
      persistent.Map[String, Int, Nothing, Glass](File.newTemporaryDirectory("suggestions_topn_").deleteOnExit().path)
    }

when the business operation is completed ( multiple map.put and one map.values.foreach ) persistent map is being closed using

map.close()

After multiple cycles memory is being occupied by swaydb.core.level.zero.LevelZeroMapCache that have root reference in scala.sys.ShutdownHookThread

It is not clear from docs is something else e.g. map.delete should be called to clear references.

[simerplaha]

Calling map.close() should be enough. delete() simply calls close and then deletes all persisted file.

This sounds like a bug with the shutdown hook.

Thank you for reporting this.