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From Mark Jacquet <mark_jacq...@yahoo.com.INVALID>
Subject Re: [users@httpd] AH00485: scoreboard is full, not at MaxRequestWorkers
Date Tue, 02 Jun 2015 00:36:41 GMT
I read that as well but the following statement he made did not make me feel like it totally
resolved the issue.
"However, what I did notice is that the same server periodically had all of its workers taken
up with requests, so that may be relevant to the problem as well."
If I did switch to "Worker" I wonder how much config file change would be needed?
Any thoughts on that?
MJ
  


     On Monday, June 1, 2015 5:33 PM, Scot Russell <scotrussell100@hotmail.com> wrote:
   

 #yiv1467884072 #yiv1467884072 --.yiv1467884072hmmessage P{margin:0px;padding:0px;}#yiv1467884072
body.yiv1467884072hmmessage{font-size:12pt;font-family:Calibri;}#yiv1467884072 I don't know
much on this, but for the bug link you included, one comment mentioned it being a problem
with event mpm, that went away when using worker mpm.  Is it possible to try the worker
mpm?

Date: Mon, 1 Jun 2015 23:58:13 +0000
From: mark_jacquet@yahoo.com.INVALID
To: users@httpd.apache.org
Subject: [users@httpd] AH00485: scoreboard is full, not at MaxRequestWorkers

Sorry for the bandwidth, this is a repeat send from January.We STILL have this issue. 
Perhaps a new look might jolt your memory and help me resolve this issue!!!

Problem: Apache server will stay up for random amount of time, usually days, but eventually
enters a hung state. When hung the CPU load gradually spikes on the machine and new web server
requests are unresponsive. Only a full server stop/kill and restart will resolve the issue,
at which time the host load average drops quickly to normal.

Error logs typically contain many many lines of:

    Wed Jan 28 16:06:58.667188 2015] [mpm_event:error] [pid 25336:tid 1] AH00485: scoreboard
is full, not at MaxRequestWorkers
I have done a lot of web research on this top and have found many cases where others have
had the same/similar issue but no real solutions. Seem very close to this bug report: https://issues.apache.org/bugzilla/show_bug.cgi?id=53555
Environment:

LDOM (VM) SunOS myhostname 5.10 Generic_118833-36 sun4v sparc SUNW,Sun-Fire-T200 
8G RAM
http Conf:

StartServers                      8
MinSpareServers              Not set
MaxSpareServers             Not set
ServerLimit                       256
MaxRequestWorkers        200
MaxConnectionsPerChild 200
KeepAlive                         On
TimeOut                           3000
MaxKeepAliveRequests   50
KeepAliveTimeout            2RequestReadTimeout header=10-20,MinRate=500 body=20,MinRate=500
We use LDAP to authenitcate most of our web tools, and this is configured like:
#
# Enable the LDAP connection pool and shared
# memory cache. Enable the LDAP cache status
# handler. Requires that mod_ldap and mod_authnz_ldap be loaded.
#
LDAPSharedCacheSize 500000
LDAPCacheEntries 1024
LDAPCacheTTL 600
LDAPOpCacheEntries 1024
LDAPOpCacheTTL 600



Current non-hung Score Board:


Apache Server Status for myserver.domain (via 5.5.5.5)
   
   - Server Version: Apache/2.4.12 (Unix)
   - Server MPM: event
   - Server Built: Feb 20 2015 13:47:55
   
   - Current Time: Monday, 01-Jun-2015 16:52:14 PDT
   - Restart Time: Monday, 01-Jun-2015 00:35:23 PDT
   - Parent Server Config. Generation: 1
   - Parent Server MPM Generation: 0
   - Server uptime: 16 hours 16 minutes 51 seconds
   - Server load: 1.06 0.84 0.60
   - Total accesses: 8263 - Total Traffic: 414.7 MB
   - CPU Usage: u20.9 s32 cu660.69 cs121.41 - 1.42% CPU load
   - .141 requests/sec - 7.2 kB/second - 51.4 kB/request
   - 2 requests currently being processed, 98 idle workers

| PID | Connections | Threads | Async connections |
| total | accepting | busy | idle | writing | keep-alive | closing |
| 18793 | 0 | yes | 0 | 25 | 0 | 0 | 0 |
| 9525 | 3 | yes | 1 | 24 | 0 | 0 | 3 |
| 13484 | 0 | yes | 0 | 25 | 0 | 0 | 0 |
| 19506 | 3 | yes | 1 | 24 | 0 | 0 | 2 |
| Sum | 6 |   | 2 | 98 | 0 | 0 | 5 |

........................._______________________________________
________W__________________________________W_________________...
................................................................
........

Any thoughts/comments on http conf tuning, OS patches, apache bug fixes appreciated.

This is a production server, so you can imagine, having it go down at random times (usually
when I am asleep) is not fun!
Thanks.
MJ
 

  
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