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  1. Core Server
  2. SERVER-56563

[RRFaM] Forge noop image oplog entries for chunk migration

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    Details

    • Type: Task
    • Status: Closed
    • Priority: Major - P3
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 4.0.25, 4.2.15, 4.4.7, 5.0.0-rc0
    • Component/s: None
    • Labels:
      None
    • Backwards Compatibility:
      Fully Compatible
    • Backport Requested:
      v4.4, v4.2, v4.0
    • Sprint:
      Repl 2021-05-17

      Description

      Chunk migrations replicate retryable findAndModify information by transferring the noop oplog entries that represent the pre/post images.

      With retryable images being saved into an implicitly replicated collection, those images are no longer naturally discovered to be transferred.

      When a chunk migration source is about to transfer an oplog entry that requires a pre/post image written in the new format, we will:

      1. perform the lookup on image collection
      2. forge a noop oplog entry

      This effectively downconverts the new retryable findAndModify format to the old format for chunk migrations.

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            Assignee:
            daniel.gottlieb Daniel Gottlieb
            Reporter:
            daniel.gottlieb Daniel Gottlieb
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              Updated:
              Resolved: