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From "Rick Archibald" <rick.archib...@electrolux.com>
Subject [users@httpd] Sending reply indefinitely
Date Wed, 24 Mar 2004 23:50:10 GMT
On the Apache Server status page, I occasionally see processes writing 
indefinitely (stuck in a "W" mode of operation) until Apache HTTP and 
Tomcat are restarted.  I'm not able to repeat this behavior on demand, but 
it always involves a request which gets forwarded to Tomcat on the same 
localhost.  After one process locks in the "Write" mode, several more 
processes lock in the "Write" mode until the entire HTTP server locks up 
and requires a reboot.  The software I'm using:  Apache HTTP 2.0.40-21.9, 
Tomcat 4.1.24, Coyote 3.0.7, and MySQL 3.23.58.  Although Tomcat, Coyote, 
poorly written servlets, or MySQL may be the cause, is there some way to 
handle this on the Apache end or do I need to address it in Coyote or 
Tomcat? 

netstat -tupan yields:

Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State  
    PID/Program name 
tcp        0      0 127.0.0.1:8005          0.0.0.0:*               LISTEN 
     4783/java 
tcp        0      0 0.0.0.0:901             0.0.0.0:*               LISTEN 
     1543/xinetd 
tcp        0      0 0.0.0.0:8009            0.0.0.0:*               LISTEN 
     4783/java 
tcp        0      0 0.0.0.0:3306            0.0.0.0:*               LISTEN 
     1614/mysqld 
tcp        0      0 0.0.0.0:139             0.0.0.0:*               LISTEN 
     1750/smbd 
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN 
     4741/httpd 
tcp        0      0 0.0.0.0:6000            0.0.0.0:*               LISTEN 
     1846/X 
tcp        0      0 0.0.0.0:21              0.0.0.0:*               LISTEN 
     1570/vsftpd 
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN 
     1528/sshd 
tcp        0      0 127.0.0.1:25            0.0.0.0:*               LISTEN 
     1627/sendmail: acce 
tcp        0      0 0.0.0.0:443             0.0.0.0:*               LISTEN 
     4741/httpd 
tcp        0      0 10.117.5.148:139        10.117.3.52:1116 ESTABLISHED 
7009/smbd 
tcp        0      0 127.0.0.1:8009          127.0.0.1:39186 ESTABLISHED 
4783/java 
tcp        0      0 127.0.0.1:8009          127.0.0.1:39184 ESTABLISHED 
4783/java 
tcp        0      0 127.0.0.1:8009          127.0.0.1:39178 ESTABLISHED 
4783/java 
tcp        0      0 127.0.0.1:3306          127.0.0.1:33064 ESTABLISHED 
1614/mysqld 
tcp        0      0 127.0.0.1:8009          127.0.0.1:39227 ESTABLISHED 
4783/java 
tcp        0      0 127.0.0.1:3306          127.0.0.1:39228 ESTABLISHED 
1614/mysqld 
tcp        1      0 127.0.0.1:44354         127.0.0.1:3306 CLOSE_WAIT 
1672/java 
tcp        0      0 127.0.0.1:8009          127.0.0.1:39250 ESTABLISHED 
4783/java 
tcp        1      0 127.0.0.1:48121         127.0.0.1:3306 CLOSE_WAIT 
4783/java 
tcp        1      0 127.0.0.1:45597         127.0.0.1:3306 CLOSE_WAIT 
1672/java 
tcp        1      0 127.0.0.1:45618         127.0.0.1:3306 CLOSE_WAIT 
1672/java 
tcp        0     60 10.117.5.148:22         10.117.3.52:1840 ESTABLISHED 
7048/sshd 
tcp        1      0 127.0.0.1:32772         127.0.0.1:3306 CLOSE_WAIT 
1672/java 
tcp        0      0 127.0.0.1:33064         127.0.0.1:3306 ESTABLISHED 
4783/java 
tcp        0      0 127.0.0.1:39228         127.0.0.1:3306 ESTABLISHED 
4783/java 
tcp        0      0 127.0.0.1:39250         127.0.0.1:8009 ESTABLISHED 
6602/httpd 
tcp        1      0 127.0.0.1:39249         127.0.0.1:8009 CLOSE_WAIT 
7601/httpd 
tcp        0      0 127.0.0.1:39178         127.0.0.1:8009 ESTABLISHED 
6605/httpd 
tcp        0      0 127.0.0.1:39186         127.0.0.1:8009 ESTABLISHED 
6606/httpd 
tcp        0      0 127.0.0.1:39184         127.0.0.1:8009 ESTABLISHED 
6603/httpd 
tcp        0      0 127.0.0.1:39227         127.0.0.1:8009 ESTABLISHED 
6601/httpd 
tcp        1      0 127.0.0.1:39103         127.0.0.1:8009 CLOSE_WAIT 
6604/httpd 
tcp        1      0 127.0.0.1:38657         127.0.0.1:8009 CLOSE_WAIT 
6608/httpd 
tcp        1      0 127.0.0.1:38666         127.0.0.1:8009 CLOSE_WAIT 
6607/httpd 
tcp        0      0 127.0.0.1:38642         127.0.0.1:8009 ESTABLISHED 
7137/httpd 
tcp      625      0 127.0.0.1:8009          127.0.0.1:38642 ESTABLISHED 
4783/java 
tcp        0      0 10.117.5.148:139        204.63.128.125:2085 
ESTABLISHED 2413/smbd 
tcp        0      0 10.117.5.148:139        192.168.90.98:4281 ESTABLISHED 
2196/smbd 
tcp        0      0 10.117.5.148:139        204.63.128.58:2499 ESTABLISHED 
2398/smbd 
udp        0      0 127.0.0.1:32772         0.0.0.0:*      2196/smbd  
udp        0      0 127.0.0.1:32773         0.0.0.0:*      2398/smbd  
udp        0      0 127.0.0.1:32774         0.0.0.0:*      2413/smbd  
udp        0      0 10.117.5.148:137        0.0.0.0:*      1755/nmbd  
udp        0      0 0.0.0.0:137             0.0.0.0:*      1755/nmbd  
udp        0      0 10.117.5.148:138        0.0.0.0:*      1755/nmbd  
udp        0      0 0.0.0.0:138             0.0.0.0:*      1755/nmbd  
udp        0      0 127.0.0.1:32794         0.0.0.0:*      7009/smbd  
udp        0      0 0.0.0.0:871             0.0.0.0:*      1543/xinetd  
udp        0      0 10.117.5.148:123        0.0.0.0:*      1560/ntpd  
udp        0      0 127.0.0.1:123           0.0.0.0:*      1560/ntpd  
udp        0      0 0.0.0.0:123             0.0.0.0:*      1560/ntpd  

The Recv-Q for 38642 looks suspicious... 

And the status page: 
Apache Server Status for webdev.eureka.com
Server Version: Apache/2.0.40 (Red Hat Linux) 
Server Built: Nov 27 2003 11:04:06 

Current Time: Wednesday, 24-Mar-2004 17:36:27 CST 
Restart Time: Wednesday, 24-Mar-2004 04:02:14 CST 
Parent Server Generation: 1 
Server uptime: 13 hours 34 minutes 13 seconds 
Total accesses: 3343 - Total Traffic: 4.3 MB 
CPU Usage: u2.05 s.64 cu0 cs0 - .00551% CPU load 
.0684 requests/sec - 91 B/second - 1342 B/request 
7 requests currently being processed, 5 idle workers 
WWWWWW__W___....................................................
................................................................
................................................................
................................................................

Scoreboard Key:
"_" Waiting for Connection, "S" Starting up, "R" Reading Request,
"W" Sending Reply, "K" Keepalive (read), "D" DNS Lookup,
"C" Closing connection, "L" Logging, "G" Gracefully finishing,
"I" Idle cleanup of worker, "." Open slot with no current process

Srv
PID
Acc
M
CPU 
SS
Req
Conn
Child
Slot
Client
VHost
Request
0-1
6601
0/389/389
W 
0.14
3686
0
0.0
0.62
0.62 
10.117.3.52
zlr.eureka.com
GET /products/upright/4870dt.jsp HTTP/1.1
1-1
6602
0/397/397
W 
0.35
3605
0
0.0
0.54
0.54 
10.117.3.52
zlr.eureka.com
GET /products/upright/4870dt.jsp HTTP/1.1
2-1
6603
0/381/381
W 
0.23
3890
0
0.0
0.63
0.63 
10.117.21.245
zlr.eureka.com
GET /products/upright/4870dt.jsp HTTP/1.1
3-1
6604
0/395/395
W 
0.40
0
0
0.0
0.54
0.54 
10.117.3.52
webdev.eureka.com
GET /status HTTP/1.1
4-1
6605
0/379/379
W 
0.11
3914
0
0.0
0.32
0.32 
10.117.21.245
zlr.eureka.com
GET /products/upright/4870dt.jsp HTTP/1.1
5-1
6606
0/380/380
W 
0.17
3885
0
0.0
0.44
0.44 
10.117.21.245
zlr.eureka.com
GET /products/upright/4870dt.jsp HTTP/1.1
6-1
6607
0/397/397
_ 
0.42
3647
0
0.0
0.52
0.52 
10.117.3.52
webdev.eureka.com
GET /phpMyAdmin/css/phpmyadmin.css.php3?lang=en-iso-8859-1&js_f
7-1
6608
0/398/398
_ 
0.39
3640
0
0.0
0.46
0.46 
10.117.3.52
webdev.eureka.com
GET /status HTTP/1.1
8-1
7137
0/210/210
W 
0.07
6538
0
0.0
0.15
0.15 
10.117.21.245
zlr.eureka.com
POST /servlet/GetQuestions HTTP/1.1
9-1
7601
0/10/10
_ 
0.14
3605
0
0.0
0.01
0.01 
10.117.3.52
zlr.eureka.com
POST /servlet/FindModel HTTP/1.1
10-1
7604
0/6/6
_ 
0.27
467
0
0.0
0.04
0.04 
10.117.3.52
webdev.eureka.com
GET /status HTTP/1.1
11-1
7615
0/1/1
_ 
0.00
253
0
0.0
0.01
0.01 
10.117.3.52
webdev.eureka.com
GET /status HTTP/1.1


Srv
Child Server number - generation
PID
OS process ID
Acc
Number of accesses this connection / this child / this slot
M
Mode of operation
CPU
CPU usage, number of seconds
SS
Seconds since beginning of most recent request
Req
Milliseconds required to process most recent request
Conn
Kilobytes transferred this connection
Child
Megabytes transferred this child
Slot
Total megabytes transferred this slot


Apache/2.0.40 Server at webdev.eureka.com Port 80

Any suggestions would be appreciated...

Best Regards,


Rick Archibald


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