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https://issues.apache.org/jira/browse/HDDS-12560?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated HDDS-12560:
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Labels: pull-request-available (was: )
> 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
> Priority: Major
> Labels: pull-request-available
>
> 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
> after taking a read lock on all of these snapshots. If there are lesser than
> N previous snapshot in the chain, only the existing snapshots would be
> considered and rest of them would be just marked as null. 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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