[Php-java-bridge-users] Apache processes stuck in state "Closing connection"

Hi,

after some upgrades on my server I've run into problem with
php-java-bridge.

When java bridge is in use, many connections are becoming stuck in state
"Closing connection" state (determined via apache server-status)
This appears only under heavy load.

Environment:
Gentoo linux
Apache tested 2.0.58-r2, 2.0.59-r5, 2.2.6
PHP 5.2.4_p20070914-r2
JavaBridge 4.0.1 4.3.0
JRE Sun 1.5.0_13

Steps to reproduce:
Install apache, php, javabridge. Simple configuration for JavaBridge:

# cat /etc/php/apache2-php5/ext-active/java.ini 
extension=java.so
[java]
java.log_level="50"
java.log_file="/tmp/php-java-bridge.log"

I have running keepalived against server for server failure detection
(about 1req/s) +
I run 
ab2 -c 50 -n 100000 http://172.31.32.40/keepalived/status.htm
to generate some load.

When JavaBridge is disabled (remove extension=java.so) everything works
fine. But when I turn JavaBridge on, many connections are becoming
stalled in state "Closing connection":

   Server uptime: 12 minutes 53 seconds
   Total accesses: 102628 - Total Traffic: 23.7 MB
   CPU Usage: u14.24 s10.53 cu0 cs0 - 3.2% CPU load
   133 requests/sec - 31.4 kB/second - 241 B/request
   60 requests currently being processed, 9 idle workers

CCCCCCCCCCCCCCC_CCCC_CCCCCCC_C_CCCCC_CCCCCCCCCCCCC_CC__CCCCCCC_W
CCCCC...........................................................
................................................................
................................................................

   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

Really strange is that I'm performing these tests on STATIC html file.
Thus PHP or JavaBridge should not be involved
Only thing what came onto my mind was JavaBridge has small thread pool.
I've increased thread pool value from default 20 up to 200. Same effect.

JavaBridge log:

# cat /tmp/php-java-bridge.log 
Oct 26 15:26:10 VMBridge INFO : VM                  :
1.5.0_13@http://java.sun.com/
Oct 26 15:26:10 VMBridge INFO : VMBridge version             : 4.3.0    
Oct 26 15:26:10 VMBridge INFO :
logFile             : /tmp/php-java-bridge.log
Oct 26 15:26:10 VMBridge INFO : default logLevel    : 50
Oct 26 15:26:10 VMBridge INFO : socket              : INET_LOCAL:9267
Oct 26 15:26:10 VMBridge INFO :
java.ext.dirs       : /opt/sun-jdk-1.5.0.13/jre/lib/ext
Oct 26 15:26:10 VMBridge INFO :
php.java.bridge.base: /usr/lib64/php5/lib/php/extensions/no-debug-non-zts-20060613
Oct 26 15:26:10 VMBridge INFO : extra library
dir   : /usr/lib64/php5/lib/php/extensions/no-debug-non-zts-20060613/lib
Oct 26 15:26:10 VMBridge INFO : thread pool size    : 200
Oct 26 15:26:10 VMBridge DEBUG: Starting to accept Socket connections

What do you think? Is there anything I can try? Is this a bug? Feature?
Or design philosophy?

Thank you for your answers.

Best regards,

-- 
Martin Filip
e-mail: ne...@sm...
jabber: ne...@sm...
www: http://www.smoula.net

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