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  1. Core Server
  2. SERVER-32154

Unbounded lookaside table growth during insert workload

    • Type: Icon: Bug Bug
    • Resolution: Fixed
    • Priority: Icon: Major - P3 Major - P3
    • 3.6.6, 4.0.0
    • Affects Version/s: 3.6.0-rc8
    • Component/s: Storage
    • Labels:
      None
    • Storage Execution
    • Fully Compatible
    • ALL

      1-node repl set, SSD, 50 GB oplog, 4 GB cache, 5 threads inserting 130 kB docs.

      It appears that the lookaside table, both number of entries and size of WiredTigerLAS.wt ("csv size" metric), grows without bound during a heavy write workload. Even after the workload is stopped the table doesn't shrink.

      FTDC data attached.

        1. growth.png
          growth.png
          146 kB
        2. dd-rc8-small.tar
          687 kB
        3. Screen Shot 2017-12-15 at 4.12.53 pm.png
          Screen Shot 2017-12-15 at 4.12.53 pm.png
          462 kB
        4. index-build.png
          index-build.png
          162 kB

            Assignee:
            backlog-server-execution Backlog - Storage Execution Team
            Reporter:
            bruce.lucas@mongodb.com Bruce Lucas (Inactive)
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            Watchers:
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              Created:
              Updated:
              Resolved: