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  1. Core Server
  2. SERVER-75814

MDB compact commands running in testing aren't actually exercising WT compact because the data size is too small and WT skips it

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    • Type: Icon: Task Task
    • Resolution: Unresolved
    • Priority: Icon: Major - P3 Major - P3
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    • Storage Engines
    • StorEng - Defined Pipeline, 2023-11-28 - Anthill Tiger
    • 5

      WT::compact skips compaction if the data size is too small
      "skipping because the file size must be greater than 1MB"

      [js_test:index_version_autoupgrade] d50050| {"t":{"$date":"2023-04-06T20:06:52.860+00:00"},"s":"I",  "c":"WTCMPCT",  "id":22430,   "ctx":"conn1","msg":"WiredTiger message","attr":{"message":{"ts_sec":1680811612,"ts_usec":860738,"thread":"11893:0x7f3546e11700","session_dhandle_name":"file:collection-15--5349796768648330457.wt","session_name":"WT_SESSION.compact","category":"WT_VERB_COMPACT","category_id":7,"verbose_level":"INFO","verbose_level_id":0,"msg":"collection-15--5349796768648330457.wt: skipping because the file size must be greater than 1MB: 4096B."}}}

      MDB layer JS tests calling the compact command aren't actually testing compaction because compaction is skipped due to too little data. For reference this is the WT::compact code.

      This is the list of effected tests:

      jstests/noPassthrough/index_version_autoupgrade.js.
      jstests/replsets/read_committed_with_catalog_changes.js
      jstests/concurrency/fsm_workloads/compact.js
      jstests/concurrency/fsm_workloads/compact_while_creating_indexes.js

      There are other tests call the MDB compact command, but the intent in those tests are things like auth, allowed to run on a secondary, view namespace handling, etc.

            Assignee:
            backlog-server-storage-engines [DO NOT USE] Backlog - Storage Engines Team
            Reporter:
            dianna.hohensee@mongodb.com Dianna Hohensee (Inactive)
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              Created:
              Updated: