httpd exhausted with smaller pool size after upgrading to JBCS httpd 2.4.51

Solution Verified - Updated

Environment

  • JBoss Core Services (JBCS)
    • Apache httpd 2.4.51
    • Apache httpd 2.4.57

Issue

  • After upgrading to JBCS httpd 2.4.51 or later, we see fewer httpd threads, which are easily exhausted:
 AH00161: server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers setting

AH00326: Server ran out of threads to serve requests. Consider raising the ThreadsPerChild setting

Resolution

  • Move your custom settings from conf.modules.d/00-mpm.conf to conf.d/mpm.conf moving forward.

Root Cause

  • 2.4.51+ changed its mpm tunings to be located in conf.d/mpm.conf, overriding conf.modules.d/00-mpm.conf settings
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