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  1. WiredTiger
  2. WT-4869

Stop adding cache pressure when eviction is falling behind

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Details

    • Improvement
    • Status: Closed
    • Major - P3
    • Resolution: Fixed
    • None
    • WT3.2.1, 4.3.1, 4.2.0-rc2, 4.0.13, 3.6.15
    • None
    • None
    • 3
    • Storage Engines 2019-06-17, Storage Engines 2019-07-01
    • v4.0, v3.6

    Description

      Some workloads create cache pressure at a faster rate than WiredTiger's background eviction threads can handle. While we can improve efficiency, with our current architecture there will always be some situations that cause the cache to reach the "trigger" point where application operations stall to perform eviction.

      As a backstop, have applications stop adding to cache pressure when background threads aren't keeping up. Since most of the cases we have seen involve large scans, this be similar to automatically turning on the "read-won't-need" flag in WiredTiger.

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          causes

          Bug - A problem which impairs or prevents the functions of the product. SERVER-40433 Mongodump extremely slow on 4.0.8

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

          Bug - A problem which impairs or prevents the functions of the product. WT-4881 Soften the restrictions on re-entering reconciliation

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

          Bug - A problem which impairs or prevents the functions of the product. WT-5218 Improve eviction to differentiate between clean and dirty pages with WT_CACHE_EVICT_NOKEEP readgen

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

          Bug - A problem which impairs or prevents the functions of the product. WT-4502 Assertion checking hazard pointers on page discard is too strong

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

          Bug - A problem which impairs or prevents the functions of the product. WT-4893 Fix a race between internal page child-page eviction checks and cursors in the tree

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

          Bug - A problem which impairs or prevents the functions of the product. WT-4957 Revert part of a change about when pages are queued for urgent eviction

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

          Bug - A problem which impairs or prevents the functions of the product. WT-5050 Assertion failure during urgent eviction of metadata page

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

          Improvement - An improvement or enhancement to an existing feature or task. WT-4898 Don't allow the eviction server to reconcile if it's busy

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

          Activity

            People

              michael.cahill@mongodb.com Michael Cahill
              michael.cahill@mongodb.com Michael Cahill
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              Dates

                Created:
                Updated:
                Resolved: