TransactionalMap - rework internal keys, sizes to descend from MvccObject, not MvccObjectVersions

nevella / alcina

Automatically exported from code.google.com/p/alcina

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TransactionalMap - rework internal keys, sizes to descend from MvccObject, not MvccObjectVersions #12

Open nevella opened 2 years ago

nevella commented 2 years ago

MvccObjectVersions is heavyweight, so the gain from vacumming is significant for long-running, high-job-performing instances

nevella commented 2 years ago

Actually there isn't so much advantage, since whatever the key object is needs to hold more than just versions() state (particularly was_deleted, initial_transaction_visible) - so...

Make MvccObjectVersions.versions nullable (and other references)
Look at STW pause (per map) to merge concurrent > nonconcurrent after a certain threshold (or maintain a queue where size > x %)

nevella commented 2 years ago

versions, cachedResolution now nulled in vacuum if there are no visible transactional versions beyond the domainidentity