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  1. Core Server
  2. SERVER-14588

prealloc of datafiles not on by default in 2.6

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Details

    • Bug
    • Status: Closed
    • Critical - P2
    • Resolution: Won't Fix
    • None
    • None
    • Storage
    • None
    • Minor Change
    • ALL
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      See above.

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      See above.
    • Server 2.7.4, Server 2.7.5, Server 2.7.6

    Description

      Mac OSX, starting up mongod from commend line (either no parameters, or passing an empty config file (old format)), using a new db and inserting inserting a single document.

      In 2.6.3, I get the following:

      drwxr-xr-x   2 thomasboyd  wheel         68 Jul 16 15:03 _tmp
      		 
      drwxr-xr-x   3 thomasboyd  wheel        102 Jul 16 15:02 journal
      		 
      -rw-------   1 thomasboyd  wheel   67108864 Jul 16 15:03 local.0
      		 
      -rw-------   1 thomasboyd  wheel   16777216 Jul 16 15:03 local.ns
      		 
      -rwxr-xr-x   1 thomasboyd  wheel          5 Jul 16 15:02 mongod.lock
      		 
      -rw-------   1 thomasboyd  wheel   67108864 Jul 16 14:50 test.0
      		 
      -rw-------   1 thomasboyd  wheel   16777216 Jul 16 14:50 test.ns

      In 2.4.10, I get the following (note two data files for test DB):

      drwxr-xr-x   2 thomasboyd  wheel         68 Jul 16 14:57 _tmp
      		 
      drwxr-xr-x   2 thomasboyd  wheel         68 Jul 16 15:01 journal
      		 
      -rw-------   1 thomasboyd  wheel   67108864 Jul 16 14:57 local.0
      		 
      -rw-------   1 thomasboyd  wheel   16777216 Jul 16 14:57 local.ns
      		 
      -rwxr-xr-x   1 thomasboyd  wheel          0 Jul 16 15:01 mongod.lock
      		 
      -rw-------   1 thomasboyd  wheel   67108864 Jul 16 14:57 test.0
      		 
      -rw-------   1 thomasboyd  wheel  134217728 Jul 16 14:57 test.1
      		 
      -rw-------   1 thomasboyd  wheel   16777216 Jul 16 14:57 test.ns

      Other than for changes around the way no/prealloc is set in YAML files, I could not find any explanation for this change of behavior in release notes or jira tickets.

      Attachments

        Issue Links

          is documented by

          Task - A task that needs to be done. DOCS-8997 prealloc of datafiles not on by default in 2.6

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

          Improvement - An improvement or enhancement to an existing feature or task. DOCS-4429 --noprealloc option (storage.preallocDataFiles) is deprecated

          • Minor - P4 - Minor loss of function, or other problem where easy workaround is present.
          • Closed
          is related to

          Task - A task that needs to be done. SERVER-13508 Don't ignore --nopreallocj if there are already prealloced files

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

          Improvement - An improvement or enhancement to an existing feature or task. SERVER-12644 Move note about noprealloc hurting performance to startup warnings

          • Trivial - P5 - Cosmetic problem like misspelt words or misaligned text.
          • Closed
          related to

          Improvement - An improvement or enhancement to an existing feature or task. SERVER-14818 Cpp test to measure FileAllocator performance

          • Minor - P4 - Minor loss of function, or other problem where easy workaround is present.
          • Closed
          links to

          Web Link fallocate(2) (Linux manual page)

          Web Link MongoDB Manual: FAQ: MongoDB Storage

          Web Link posix_fallocate

          Web Link posix_fallocate(3) (Linux manual page)

          Activity

            People

              matt.kangas Matt Kangas
              thomas.boyd Thomas Boyd
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              Dates

                Created:
                Updated:
                Resolved: