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  1. Core Server
  2. SERVER-17501

Increase journalling capacity limits

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    Details

    • Type: Improvement
    • Status: Closed
    • Priority: Critical - P2
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 3.0.1, 3.1.0
    • Component/s: Concurrency, MMAPv1
    • Labels:
      None
    • Backwards Compatibility:
      Minor Change
    • Backport Completed:

      Description

      Issue Status as of Mar 10, 2015

      ISSUE SUMMARY
      On MongoDB with the MMAPv1 storage engine, the journalling subsystem warns about large updates exceeding 128MB for 32-bit systems and 256MB for 64-bit systems as follows:

      warning assertion failure a <= 256*1024*1024 src/mongo/util/alignedbuilder.cpp
      

      Concurrent operations updating large documents may exceed the maximum journalling capacity of 256MB for 32-bit systems and 512MB for 64-bit systems. When that limit is exceeded the server shuts down with a log message like the following:

      Assertion failure a <= 512*1024*1024 src/mongo/util/alignedbuilder.cpp 
      

      RESOLUTION DETAILS
      MongoDB versions 3.0.1 and above increase the limits for the journalling capacity for 64-bit systems to warn at 512MB, and shut down at 2000MB with a message like the following:

      I - [durability] error writing journal: too much uncommitted data (2098200576 bytes)
      I - [durability] shutting down immediately to avoid corruption
      I - [durability] Fatal Assertion 28614
      

      The journalling capacity limits for 32-bit systems remain unchanged.

      Original description

      3.0 allows for much higher concurrency than 2.6, so the hardcoded journal limits of 256M for warning and 512M for crash should be increased.

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                • Created:
                  Updated:
                  Resolved: