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[Bug 1466926] Re: reload apache2 with mpm_event cause scoreboard is full

To: group.of.nepali.translators@xxxxxxxxxxxxxxxxxxx
From: Haw Loeung <1466926@xxxxxxxxxxxxxxxxxx>
Date: Mon, 10 Jul 2017 07:00:36 -0000
Reply-to: Bug 1466926 <1466926@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

** Also affects: apache2 (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Also affects: apache2 (Ubuntu Trusty)
   Importance: Undecided
       Status: New

** Changed in: apache2 (Ubuntu Xenial)
       Status: New => Confirmed

** Changed in: apache2 (Ubuntu Trusty)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1466926

Title:
  reload apache2  with mpm_event cause  scoreboard is full

Status in apache2 package in Ubuntu:
  Fix Released
Status in apache2 source package in Trusty:
  Confirmed
Status in apache2 source package in Xenial:
  Confirmed

Bug description:
  On the clean install Ubuntu 14.04 with Apache without almost any
  client load the Apache server with the command "service apache2
  reload" itself allocates slots marked with "Gracefully finishing" for
  which rejects new connections.

  For full rejection of new requests is sufficient to perform 4x command
  "service apache2 reload".

  Ubuntu 14.04.2 LTS
  Apache 2.4.7-ubuntu4.4 (mpm_event)
  Kernel 2.16.0-30-generic

  
  Reproduce problem:
  #################################################
  1/ service apache2 start
  ______________________________________________________W_________
  ___________.....................................................
  ......................

  2/ service apache2 reload

  .........................GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
  GGGGGGGGGGG__________________________________________________W__
  ______________________

  3/ service apache2 reload

  ___W_____________________GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
  GGGGGGGGGGG__________________________________________________...
  ......................

  4/ service apache2 reload

  GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
  GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG___
  W_____________________

  5/ service apache2 reload -> Server Apache not responding 
  With logs in apache error log file:
  ... [mpm_event:error] [pid 9381:tid 1234563234] AH00485: scoreboard is full, not at MaxRequestWorkers
  ...
  #################################################

  
  My workaround was change to  MPM module  from "mpm_event" to "mpm_worker".

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