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  1. WiredTiger
  2. WT-3115

Change the dhandle lock to a read/write lock

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Details

    • Improvement
    • Status: Closed
    • Major - P3
    • Resolution: Fixed
    • None
    • WT2.9.2, 3.2.13, 3.4.3, 3.5.4
    • None
    • None
    • Storage 2017-02-13

    Description

      WiredTiger currently has a lock that is used to protect access to the connection wide (globally shared) dhandle list. That lock is currently a spinlock, since operations that hold it are generally short lived. The assumption about short-lived lockers doesn't hold entirely true when the number of open dhandles grows very large.

      It would be beneficial to switch the lock from a spinlock to a read/write lock, since most code paths only need to protect against the list changing while they are accessing it.

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          is depended on by

          Bug - A problem which impairs or prevents the functions of the product. SERVER-27700 WT secondary performance drops to near-zero with cache full

          • Major - P3 - Major loss of function.
          • Closed
          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. SERVER-28172 Renaming collection causes permanent performance issue on secondary

          • Critical - P2 - Crashes, loss of data, severe memory leak.
          • Closed
          is related to

          Improvement - An improvement or enhancement to an existing feature or task. WT-3345 Improve rwlock scaling

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

          Activity

            People

              alexander.gorrod@mongodb.com Alexander Gorrod
              alexander.gorrod@mongodb.com Alexander Gorrod
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              Dates

                Created:
                Updated:
                Resolved: