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  1. Core Server
  2. SERVER-36820

Wired Tiger Compression

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major - P3
    • Resolution: Duplicate
    • Affects Version/s: 4.0.1
    • Fix Version/s: None
    • Component/s: WiredTiger
    • Environment:
      Amazon Linux
    • Operating System:
      ALL
    • Case:

      Description

      Hi,

      We recently upgraded out MongoDB from community version 3.4.14 to 4.0.1

      We see that the compression ratio differs for the same type of data between the version

      Hence we did a test and found that compression ratio drastically fell for 3.6+ 

      Version Raw size Storage size Comp Ratio
      4.0 10378066324 1594658816 6.5x
      3.6 10378066324 1599205376 6.49x
      3.4 10378066324 634499072 16.35x

      Can you please suggest if any changes has to be made in the configuration of MongoDB or WiredTiger?

      Below is the wired tiger configuration we are using

      wiredTiger:
      collectionConfig:
      blockCompressor: zlib
      engineConfig:
      directoryForIndexes: true
      journalCompressor: none
      cacheSizeGB: 40
      configString: "eviction_dirty_target=60, eviction_dirty_trigger=80, eviction=(threads_min=20,threads_max=20)"

      Thanks,

      Tanveer

       

        Attachments

          Issue Links

          is related to

          Task - A task that needs to be done. WT-3897 raw compression (lz4, zlib) less effective in 3.6 release

          • Minor - P4 - Minor loss of function, or other problem where easy workaround is present.
          • Closed

          Improvement - An improvement or enhancement to an existing feature or task. WT-3968 Use compression ratio to tune page sizes

          • Major - P3 - Major loss of function.
          • Closed

            Activity

              People

              Assignee:
              milkie Eric Milkie
              Reporter:
              tanveermadan Tanveer Madan Marate
              Participants:
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                Dates

                Created:
                Updated:
                Resolved: