Uploaded image for project: 'Core Server'
  1. Core Server
  2. SERVER-27315

Mongo wt cache will not be reclaimed

    XMLWordPrintableJSON

Details

    • Icon: Bug Bug
    • Resolution: Works as Designed
    • Icon: Major - P3 Major - P3
    • None
    • 3.2.9
    • WiredTiger
    • None
    • CentOS release 6.6

    Description

      At 18:15 this time point, wt cache continues to grow until 96%. then at 19:00, we switch primary to secondary.
      Since then, this mongo service almost without any request, but the wt cache is not recovered, has remained at around 92%.
      I guess some reason is that the cache can not be recycled.

      System environment
      System: CentOS release 6.6
      Kernel: 2.6.32-504.el6.x86_64
      Memory: 256G
      Disk: SSD-PCIE
      File System: xfs
      mongo version: 3.2.9
      Config:

      Storage:
      DbPath: "/ mongo / db"
      DirectoryPerDB: true
      Engine: wiredTiger
      WiredTiger:
      EngineConfig:
      CacheSizeGB: 200
      JournalCompressor: none
      CollectionConfig:
      BlockCompressor: snappy
      Security:
      KeyFile: "/ mongo / mongodb-keyfile"

      Attachments

        1. diagnostic.data.tgz
          93.24 MB
        2. page evicted.png
          page evicted.png
          47 kB
        3. page passed.png
          page passed.png
          65 kB
        4. page split.png
          page split.png
          59 kB
        5. QQ图片20161214132506.png
          QQ图片20161214132506.png
          124 kB
        6. Screen Shot 2016-12-12 at 9.50.42 am.png
          Screen Shot 2016-12-12 at 9.50.42 am.png
          156 kB
        7. wt_cache.png
          wt_cache.png
          67 kB

        Activity

          People

            kelsey.schubert@mongodb.com Kelsey Schubert
            ufozhangliang@163.com liangzhang
            Votes:
            0 Vote for this issue
            Watchers:
            6 Start watching this issue

            Dates

              Created:
              Updated:
              Resolved: