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  1. Core Server
  2. SERVER-61859

Investigate performance penalty of change streams optimizations in "shard lite" configuration

    • Type: Icon: Bug Bug
    • Resolution: Unresolved
    • Priority: Icon: Minor - P4 Minor - P4
    • None
    • Affects Version/s: None
    • Component/s: None
    • None
    • Query Execution
    • ALL
    • QE 2022-02-07

      The change_streams_listen_throughput benchmark shows a roughly 7% performance loss in 5.2 (compared to 5.0) in the case where there is no `$match` stage to optimize.

      This tradeoff is reasonable in exchange for the substantial performance improvement available when `$match` can be optimized (especially considering that other variants show much less of a performance penalty), but it would be worthwhile to investigate the specifics of the loss and see if there are potential mitigations.

            Assignee:
            backlog-query-execution [DO NOT USE] Backlog - Query Execution
            Reporter:
            justin.seyster@mongodb.com Justin Seyster
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              Created:
              Updated: