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  1. Core Server
  2. SERVER-21920

Use enhanced WiredTiger next_random cursors for oplog stones

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Details

    • Improvement
    • Status: Closed
    • Major - P3
    • Resolution: Fixed
    • None
    • 3.2.1, 3.3.0
    • Storage
    • Fully Compatible
    • QuInt E (01/11/16)

    Description

      The basic implementation of WiredTiger random cursors doesn't do a very good job if the tree is unbalanced.

      There is an enhanced next_random implementation that gives a pseudo random set of keys distributed somewhat evenly across the file. In order to use the new functionality it's necessary to tell WiredTiger approximately how many samples are going to be taken.

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          is related to

          Bug - A problem which impairs or prevents the functions of the product. WT-2262 Random sampling is skewed by tree shape

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

          Bug - A problem which impairs or prevents the functions of the product. SERVER-55821 remove next_random_sample_size=1000 configuration in the oplog sampling code

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

          Activity

            People

              max.hirschhorn@mongodb.com Max Hirschhorn
              alexander.gorrod@mongodb.com Alexander Gorrod
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              Dates

                Created:
                Updated:
                Resolved: