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AH03139/AH03142 error on Apache httpd logs

[Mon Jan 09 19:17:16.103792 2021] [mpm_worker:alert] [pid 32641:tid 140581873211136] (11)Resource temporarily unavailable: AH03142: apr_thread_create: unable to create worker thread
[Mon Jan 09 19:17:16.103807 2021] [mpm_worker:alert] [pid 1929:tid 140581873211136] (11)Resource temporarily unavailable: AH03142: apr_thread_create: unable to create worker thread

[Mon Jan 09 19:17:16.107960 2021] [mpm_worker:emerg] [pid 32690:tid 140581795788544] (22)Invalid argument: ap_queue_info_set_idle failed. Attempting to shutdown process gracefully.
[Mon Jan 09 19:17:16.108979 2021] [mpm_worker:crit] [pid 32690:tid 140581787395840] (22)Invalid argument: AH03139: ap_queue_pop failed
[Mon Jan 09 19:17:16.108991 2021] [mpm_worker:crit] [pid 32690:tid 140581787395840] (22)Invalid argument: AH03139: ap_queue_pop failed
[Mon Jan 09 19:17:16.108994 2021] [mpm_worker:crit] [pid 32690:tid 140581787395840] (22)Invalid argument: AH03139: ap_queue_pop failed

(AH03139), the error AH03142 is thrown when the Apache HTTPD has been limited by the OS in any way. Either there’s no enough memory available or the OS limits has been achieved.

Verify with OS team if any errors on the OS logs regarding the limits and tune accordingly and restart the httpd . it may be intermittent but good to keep systems with in the required limits .

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