Uploaded image for project: 'Core Server'
  1. Core Server
  2. SERVER-63217

Handle returning the collection namespace at the time of the checkpoint if it was renamed

XMLWordPrintableJSON

    • Type: Icon: Task Task
    • Resolution: Duplicate
    • Priority: Icon: Major - P3 Major - P3
    • None
    • Affects Version/s: None
    • Component/s: None
    • Labels:
      None
    • Execution Team 2022-02-21

      The backup cursor ns field may not be representative of the collection name at the time of the backup. Consider the following scenario:

      System -> checkpointTimestamp = 10, oldestTimestamp = 15
Client -> Rename collection "a" to "b" at timestamp 20
System -> checkpointTimestamp = 10, oldestTimestamp = 25
Client -> Open $backupCursor. Will copy files at the checkpointTimestamp
Client -> Comes across the file for renamed collection. ns field is "b". Want "a".

      We need a way to keep track of collection renames in memory. This would be a similar mechanism as two-phase collection drops, which keeps the collection files until the dropTimestamp is < min(checkpointTimestamp, oldestTimestamp). This would allow us to resolve the collection name at the checkpointTimestamp.

            Assignee:
            gregory.wlodarek@mongodb.com Gregory Wlodarek
            Reporter:
            gregory.wlodarek@mongodb.com Gregory Wlodarek
            Votes:
            0 Vote for this issue
            Watchers:
            1 Start watching this issue

              Created:
              Updated:
              Resolved: