Process exiting because it reached MaxConnectionsPerChild in apache server

Question

We are using apache version 4. Our server we are getting around 8000 concurrent connections. Below is our worker module configuration

<IfModule mpm_worker_module>
    ServerLimit             16
    StartServers             20
    MaxClients                 8000
    MinSpareThreads         512
    MaxSpareThreads        1024
    ThreadsPerChild         64
    MaxRequestWorkers      1024
    MaxConnectionsPerChild 10000
</IfModule>

With the above configuration we are getting below error in apache server error.log

[Mon Nov 12 12:38:58.838952 2018] [mpm_winnt:notice] [pid 3304:tid 480] AH00418: Parent: Created child process 6416
[Mon Nov 12 12:38:59.745235 2018] [jk:warn] [pid 6416:tid 364] No JkLogFile defined in httpd.conf. Using default C:/Apache/logs/mod_jk.log
[Mon Nov 12 12:38:59.917109 2018] [jk:warn] [pid 6416:tid 364] No JkLogFile defined in httpd.conf. Using default C:/Apache/logs/mod_jk.log
[Mon Nov 12 12:38:59.932736 2018] [mpm_winnt:notice] Child: Starting 250 worker threads.
[Mon Nov 12 12:39:06.471238 2018] [mpm_winnt:error]  Server ran out of threads to serve requests. Consider raising the ThreadsPerChild setting

After that we changed ThreadsPerChild to 100, after that we are getting below error

[Mon Nov 12 12:47:35.837220 2018] [core:notice] [pid 3304:tid 480] AH00094: Command line: 'C:\\Apache\\bin\\httpd.exe -d C:/ApacheWeb'
[Mon Nov 12 12:47:35.837220 2018] [mpm_winnt:notice] [pid 3304:tid 480] AH00418: Parent: Created child process 9188
[Mon Nov 12 12:47:36.821579 2018] [jk:warn] [pid 9188:tid 368] No JkLogFile defined in httpd.conf. Using default C:/ApacheWeb/logs/mod_jk.log
[Mon Nov 12 12:47:37.102834 2018] [jk:warn] [pid 9188:tid 368] No JkLogFile defined in httpd.conf. Using default C:/ApacheWeb/logs/mod_jk.log
[Mon Nov 12 12:47:37.118481 2018] [mpm_winnt:notice] [pid 9188:tid 368] AH00354: Child: Starting 250 worker threads.
[Mon Nov 12 12:48:02.464408 2018] [mpm_winnt:error] [pid 9188:tid 6488] AH00326: Server ran out of threads to serve requests. Consider raising the ThreadsPerChild setting
[Mon Nov 12 12:48:10.216397 2018] [mpm_winnt:notice] [pid 7888:tid 364] AH00362: Child: Waiting 30 more seconds for 29 worker threads to finish.
[Mon Nov 12 12:48:43.069214 2018] [mpm_winnt:notice] [pid 7888:tid 364] AH00362: Child: Waiting 0 more seconds for 7 worker threads to finish.
[Mon Nov 12 12:48:43.178567 2018] [mpm_winnt:notice] [pid 7888:tid 364] AH00363: Child: Terminating 7 threads that failed to exit.
[Mon Nov 12 12:48:43.178567 2018] [mpm_winnt:notice] [pid 7888:tid 364] AH00364: Child: All worker threads have exited.
[Mon Nov 12 12:49:37.253636 2018] [mpm_winnt:notice] [pid 9188:tid 368] AH00363: Child: Terminating 243 threads that failed to exit.
[Mon Nov 12 12:49:37.253636 2018] [mpm_winnt:notice] [pid 9188:tid 368] AH00364: Child: All worker threads have exited.

After that we are using the below configuration

<IfModule mpm_worker_module>
    ServerLimit             125
    StartServers            20
    MinSpareThreads         512
    MaxSpareThreads         1024
    ThreadsPerChild         64
    MaxRequestWorkers       8000
    MaxConnectionsPerChild  10000
</IfModule>

Now we are getting below log

[Mon Nov 12 14:29:08.996704 2018] [core:notice] [pid 7124:tid 476] AH00094: Command line: 'C:\\Apache\\bin\\httpd.exe -d C:/Apache'
[Mon Nov 12 14:29:08.996704 2018] [mpm_winnt:notice] [pid 7124:tid 476] AH00418: Parent: Created child process 8708
[Mon Nov 12 14:29:09.981085 2018] [jk:warn] [pid 8708:tid 372] No JkLogFile defined in httpd.conf. Using default C:/Apache/logs/mod_jk.log
[Mon Nov 12 14:29:10.184213 2018] [jk:warn] [pid 8708:tid 372] No JkLogFile defined in httpd.conf. Using default C:/Apache/logs/mod_jk.log
[Mon Nov 12 14:29:10.199837 2018] [mpm_winnt:notice] [pid 8708:tid 372] AH00354: Child: Starting 250 worker threads.
[Mon Nov 12 14:29:43.361221 2018] [mpm_winnt:notice] [pid 5988:tid 372] AH00362: Child: Waiting 30 more seconds for 11 worker threads to finish.
[Mon Nov 12 14:30:00.549960 2018] [mpm_winnt:notice] [pid 5988:tid 372] AH00364: Child: All worker threads have exited.
[Mon Nov 12 14:31:33.959999 2018] [mpm_winnt:notice] [pid 8708:tid 372] AH00358: Child: Process exiting because it reached MaxConnectionsPerChild. Signaling the parent to restart a new child process.
[Mon Nov 12 14:31:33.959999 2018] [mpm_winnt:notice] [pid 7124:tid 476] AH00424: Parent: Received restart signal -- Restarting the server.

We are frequently getting

Child: Process exiting because it reached MaxConnectionsPerChild. Signaling the parent to restart a new child process.

how to resolve this error any help will be greatly appreciated!!!

That's a notice, not a warning or an error. Why do you want to solve it if it's not an error? — RealSkeptic, Nov 12 '18 at 14:19
@RealSkeptic, Thanks for the response, its happening on every 5 seconds i studied if the restart happens frequently it will consume more CPU. That s the reason i want to fix it.I just want to make that happen in every 5 minutes like that — Selva, Nov 12 '18 at 15:02
Take a look at [this question about MaxConnectionsPerChild](https://stackoverflow.com/q/22732768/4125191). Also, your question really has nothing to do with Java, so I'm removing the Java tag. — RealSkeptic, Nov 12 '18 at 15:48
Thanks @RealSkeptic for the link. I understood the usage of MaxConnectionsPerChild parameters — Selva, Nov 13 '18 at 05:06

score 0 · Answer 1 · edited Dec 27 '18 at 07:39

0

You are using a Windows implementation module (mpm_winnt) instead of mpm_worker_module. Try locate the section:

<IfModule mpm_winnt_module>
    ThreadsPerChild        1000
    MaxConnectionsPerChild   20000
 AcceptFilter http None    
    AcceptFilter https None  
</IfModule>

and modify the ThreadsPerChild parameter.

edited Dec 27 '18 at 07:39

Đinh Hồng Châu

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answered Dec 27 '18 at 01:39

Len Lin

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Process exiting because it reached MaxConnectionsPerChild in apache server

1 Answers1