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  1. Core Server
  2. SERVER-40433

Mongodump extremely slow on 4.0.8

    • Type: Icon: Bug Bug
    • Resolution: Done
    • Priority: Icon: Major - P3 Major - P3
    • None
    • Affects Version/s: 4.0.8
    • Component/s: None
    • None
    • ALL
    • Storage Engines 2019-07-01
    • 3

      Since upgrading to mongo 4.0.8 from 3.4.6 our mongodumps have become extremely slow.

      mongodump --archive=${DIR}.gz \
      -h ${MONGO_REPL_SET_NAME}/${MONGO_SET} \
      -u ${MONGO_USER} \
      -p ${MONGO_PWD} \
      --gzip \
      --readPreference secondaryPreferred \
      --ssl \
      --sslCAFile mongodb-ca.crt \
      --authenticationDatabase admin \
      --${DB_OR_OPLOG} \
      --forceTableScan 

      is the command we run for backups. Since the upgrade we are seeing about 10x slower backups.
      Tried moving to a new machine with more memory and didn't see any speed improvement. CPU has 1 core at 100% while the rest of the cores have little to no activity. iostat doesn't show disk to be anywhere near saturated. We have tried running mongodump with the 3.6 and 4.0 cli too without any improvement. 

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        6. SERVER-40433-3.6.6-vs-4.0.9-eviction.png
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        8. server-40433-4.09-metrics.png
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        9. server-40433-lock-issue.png
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            Assignee:
            daniel.hatcher@mongodb.com Danny Hatcher (Inactive)
            Reporter:
            paulblend Paul Henderson
            Votes:
            1 Vote for this issue
            Watchers:
            21 Start watching this issue

              Created:
              Updated:
              Resolved: