Swaminathan Balachandran created HDDS-12560:
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Summary: Reclaimable Filter for Snaphost Garbage Collections
Key: HDDS-12560
URL: https://issues.apache.org/jira/browse/HDDS-12560
Project: Apache Ozone
Issue Type: Sub-task
Reporter: Swaminathan Balachandran
Assignee: Swaminathan Balachandran
Currently all garbage collection threads peek into previous snapshots to check
whether a particular deleted key/deleted Directory/ RenameEntry can be removed
from the system. All of these operations happen without taking locks because of
which all of these threads could be working on an inconsistent snapshot data.
This patch implements a general utility class which would be responsible for
opening last N snapshots from the snapshot chain corresponding to the keys
bucket where N is going to be defined by the garbage collection thread based on
whether if it is reclaiming a deletedKey/deletedDirectory/RenameEntry. This
utility class should fail opening the snapshot if any of these snaphshots are
not active, since a deleted snapshot could be in an inconsistent state.
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