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  1. Core Server
  2. SERVER-56563

[RRFaM] Forge noop image oplog entries for chunk migration

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Details

    • Task
    • Status: Closed
    • Major - P3
    • Resolution: Fixed
    • None
    • 4.0.25, 4.2.15, 4.4.7, 5.0.0-rc0
    • None
    • None
    • Fully Compatible
    • v4.4, v4.2, v4.0
    • 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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            daniel.gottlieb@mongodb.com Daniel Gottlieb
            daniel.gottlieb@mongodb.com Daniel Gottlieb
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              Created:
              Updated:
              Resolved: