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https://issues.apache.org/jira/browse/HDDS-7598?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated HDDS-7598:
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Labels: proton pull-request-available (was: proton)
> Quota for snapshot handling
> ---------------------------
>
> Key: HDDS-7598
> URL: https://issues.apache.org/jira/browse/HDDS-7598
> Project: Apache Ozone
> Issue Type: Sub-task
> Reporter: Sumit Agrawal
> Assignee: Sumit Agrawal
> Priority: Minor
> Labels: proton, pull-request-available
>
> Snapshot is created as a copy of OM DB at that point of time for the bucket.
> Here, quota consumed will be shared between active and snapshot DB.
> space-quota: diskspace as used by keys/files remains same when snapshot is
> taken. Same block content are referrred by both active DB and snapshot DB. Eg:
> # In active DB, a key is created with 1GB space. (reference count is 1)
> # A snapshot is taken and key is a part of snapshot, so Reference count
> becomes "2". And space qouta remains same as consumed.
> # If any further snapshot is taken and key is present in snapshot, reference
> count is increased. While if snapshot is removed, reference count gets
> decremented.
> # If reference count becomes "0", quota is released as key is getting
> deleted.
> namespace-quota: This is the number of keys and files in bucket recursively
> for the bucket. For snapshot, this is also shared with active DB (reference
> counted).
> So, snapshot in Ozone does not consume extra namespace and space-quota
> whenever snapshot is created.
>
> Handling of Quota release when key/files/directories are getting removed:
> * Whenever a snapshot is deleted, it will check if entity
> (keys/files/directories) present in deletedTable/deletedDirectory table are
> also being referred by previous snapshot
> ** If previous snapshot also have same entity is present, then the entity
> will be moved from deletedTable/deletedDirectory table of current snapshot to
> previous snapshot DB.
> ** If not present, then it will perform cleanup of entity (cleanup of
> blocks) and while purge will handle quota (similar to active DB key and
> directory deleting service).
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