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  1. Core Server
  2. SERVER-13346

Provide an option to force journal preallocation and recycling

        Details

        • Type: Improvement
        • Status: Open
        • Priority: Minor - P4
        • Resolution: Unresolved
        • Affects Version/s: None
        • Fix Version/s: Backlog
        • Component/s: MMAPv1, Storage
        • Labels:
          None

          Description

          Journal file preallocation and recycling (see preallocj in the code) is enabled based on the outcome of a short performance test run at process start. When mongod is deployed at scale this is likely to result in some servers using preallocj=true and others using preallocj=false. That non-determinism is not good for a DBA.

          I get 10% better throughput from insert benchmark workloads using fast (PCIe flash) storage after forcing preallocj to be true. See http://smalldatum.blogspot.com/2014/03/redo-logs-in-mongodb-and-innodb.html

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                Dates

                • Created:
                  Updated: