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  1. Core Server
  2. SERVER-29843

Make oplog queries with point equality on ts field use getOplogStartHack

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Details

    • Improvement
    • Status: Closed
    • Major - P3
    • Resolution: Fixed
    • 3.5.9
    • 3.6.0-rc4
    • Querying
    • None
    • Minor Change
    • Sharding 2017-10-02, Query 2017-10-23, Query 2017-11-13
    • 35

    Description

      Doing point queries on the ts field is slow in the oplog because the oplog does not have any indexes. WT has a hack that allows it to do binary search on the ts field but is only enabled when the query predicate has top level $gt/$gte.

      This is needed by retryable writes in order to do fast lookup on oplog entries when traversing through the write history within a transaction.

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        Issue Links

          is depended on by

          Improvement - An improvement or enhancement to an existing feature or task. SERVER-31863 Make TransactionHistoryIterator use oplogHack

          • Major - P3 - Major loss of function.
          • Closed
          is documented by

          Task - A task that needs to be done. DOCS-11002 Make oplog queries with point equality on ts field use getOplogStartHack (SERVER-29843)

          • Major - P3 - Major loss of function.
          • Closed
          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. SERVER-31687 Missing minvalid in sync source cause oplog full table scan all the time

          • Major - P3 - Major loss of function.
          • Closed
          is related to

          Bug - A problem which impairs or prevents the functions of the product. SERVER-13566 Using the OplogReplay flag with extra predicates can yield incorrect results

          • Critical - P2 - Crashes, loss of data, severe memory leak.
          • Closed

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              tess.avitabile@mongodb.com Tess Avitabile (Inactive)
              randolph@mongodb.com Randolph Tan
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              Dates

                Created:
                Updated:
                Resolved: