[jira] [Updated] (HDDS-7598) Quota for snapshot handling

["Hemant Kumar (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDDS-7598?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hemant Kumar updated HDDS-7598:
-------------------------------
        Parent:     (was: HDDS-8319)
    Issue Type: Bug  (was: Sub-task)

> Quota for snapshot handling
> ---------------------------
>
>                 Key: HDDS-7598
>                 URL: https://issues.apache.org/jira/browse/HDDS-7598
>             Project: Apache Ozone
>          Issue Type: Bug
>            Reporter: Sumit Agrawal
>            Assignee: Sumit Agrawal
>            Priority: Minor
>              Labels: proton, pull-request-available
>             Fix For: 1.4.0
>
>
> 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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