mod_jk performance optimization

c***@covalent.net

2002-05-02 17:04:13 UTC

Post by M. Serrano
Hi.
I've got installed in my box Linux, Apache 1.3.19, JDK 1.3.1 and TC 3.3.1
working with ajp13. The following error appeard in my mod_jk.log after a bit
[jk_ajp13_worker.c (203)]: connection_tcp_get_message: Error -
jk_tcp_socket_recvfull failed
[jk_ajp13_worker.c (621)]: Error reading request
From the line numbers, you may use an older version of jk, try updating

from CVS head first ( the bug may be already fixed ) ( you can use either
the 'frozen' jk from 3.3 or j-t-c ).

The error message means from some reasons tomcat didn't sent back any
content - so you may need to look in tomcat's lots as well.

( the 'reading request' means the request from tomcat to jk to send a
chunk of data )

Costin

Post by M. Serrano
After analysing the server's config files and reading some threads, I
concluded that the problem might be resolved through a bit of extra
re-configuration. Although the problem appearence was delayed, it still
existed.
I wonder if anyone out there could help me with this subject. I'm sending in
attach some lines of httpd.conf, server.xml and mod_jk.conf
Thanx a lot for your time.
Serrano.
##
## httpd.conf -- Apache HTTP server configuration file
##
#
# Timeout: The number of seconds before receives and sends time out.
#
Timeout 300
#
# KeepAlive: Whether or not to allow persistent connections (more than
# one request per connection). Set to "Off" to deactivate.
#
KeepAlive On
#
# MaxKeepAliveRequests: The maximum number of requests to allow
# during a persistent connection. Set to 0 to allow an unlimited amount.
# We recommend you leave this number high, for maximum performance.
#
MaxKeepAliveRequests 100
#
# KeepAliveTimeout: Number of seconds to wait for the next request from the
# same client on the same connection.
#
KeepAliveTimeout 15
#
# Server-pool size regulation. Rather than making you guess how many
# server processes you need, Apache dynamically adapts to the load it
# sees --- that is, it tries to maintain enough server processes to
# handle the current load, plus a few spare servers to handle transient
# load spikes (e.g., multiple simultaneous requests from a single
# Netscape browser).
#
# It does this by periodically checking how many servers are waiting
# for a request. If there are fewer than MinSpareServers, it creates
# a new spare. If there are more than MaxSpareServers, some of the
# spares die off. The default values are probably OK for most sites.
#
MinSpareServers 5
MaxSpareServers 10
#
# Number of servers to start initially --- should be a reasonable ballpark
# figure.
#
StartServers 8
#
# Limit on total number of servers running, i.e., limit on the number
# of clients who can simultaneously connect --- if this limit is ever
# reached, clients will be LOCKED OUT, so it should NOT BE SET TOO LOW.
# It is intended mainly as a brake to keep a runaway server from taking
# the system with it as it spirals down...
#
MaxClients 150
#
# MaxRequestsPerChild: the number of requests each child process is
# allowed to process before the child dies. The child will exit so
# as to avoid problems after prolonged use when Apache (and maybe the
# libraries it uses) leak memory or other resources. On most systems, this
# isn't really needed, but a few (such as Solaris) do have notable leaks
# in the libraries. For these platforms, set to something like 10000
# or so; a setting of 0 means unlimited.
#
# NOTE: This value does not include keepalive requests after the initial
# request per connection. For example, if a child process handles
# an initial request and 10 subsequent "keptalive" requests, it
# would only count as 1 request towards this limit.
#
MaxRequestsPerChild 200
#
# DocumentRoot: The directory out of which you will serve your
# documents. By default, all requests are taken from this directory, but
# symbolic links and aliases may be used to point to other locations.
#
DocumentRoot /usr/local/jakarta-tomcat-3.3.1/webapps/ROOT
# This should be changed to whatever you set DocumentRoot to.
#
<Directory "/usr/local/jakarta-tomcat-3.3.1/webapps/ROOT">
#
# This may also be "None", "All", or any combination of "Indexes",
# "Includes", "FollowSymLinks", "ExecCGI", or "MultiViews".
#
# Note that "MultiViews" must be named *explicitly* --- "Options All"
# doesn't give it to you.
#
Options indexes includes followSymLinks
#
# This controls which options the .htaccess files in directories can
# override. Can also be "All", or any combination of "Options", "FileInfo",
# "AuthConfig", and "Limit"
#
AllowOverride None
#
# Controls who can get stuff from this server.
#
Order allow,deny
Allow from all
</Directory>
# Include TOMCAT
Include /usr/local/jakarta-tomcat-3.3.1/conf/auto/mod_jk.conf-local
----------------- mod_jk.conf-local -----------------
########## Auto generated on Tue Apr 30 11:47:40 WEST 2002##########
<IfModule !mod_jk.c>
LoadModule jk_module libexec/mod_jk.so
AddModule mod_jk.c
</IfModule>
JkWorkersFile "/usr/local/jakarta-tomcat-3.3.1/conf/jk/workers.properties"
JkLogFile "/usr/local/jakarta-tomcat-3.3.1/logs/mod_jk.log"
JkLogLevel error
#################### /WebApplication ####################
# Static files
Alias /WebApplication
"/usr/local/jakarta-tomcat-3.3.1/webapps/WebApplication"
<Directory "/usr/local/jakarta-tomcat-3.3.1/webapps/WebApplication">
Options Indexes FollowSymLinks
DirectoryIndex index.jsp index.html index.htm
</Directory>
# Deny direct access to WEB-INF and META-INF
#
<Location "/WebApplication/WEB-INF/*">
AllowOverride None
deny from all
</Location>
<Location "/WebApplication/META-INF/*">
AllowOverride None
deny from all
</Location>
JkMount /WebApplication/servlet ajp13
JkMount /WebApplication/servlet/* ajp13
JkMount /WebApplication/*.jsp ajp13
#################### / ####################
# Be sure to update DocumentRoot
# to point to: "/usr/local/jakarta-tomcat-3.3.1/webapps/ROOT"
<Directory "/usr/local/jakarta-tomcat-3.3.1/webapps/ROOT">
Options Indexes FollowSymLinks
DirectoryIndex index.jsp index.html index.htm
</Directory>
# Deny direct access to WEB-INF and META-INF
#
<Location "/WEB-INF/*">
AllowOverride None
deny from all
</Location>
<Location "/META-INF/*">
AllowOverride None
deny from all
</Location>
JkMount /servlet ajp13
JkMount /servlet/* ajp13
JkMount /*.jsp ajp13
------ server.xml ------
.
.
.
<ApacheConfig forwardAll="false" noRoot="false" jkDebug="error"/>
<IISConfig noRoot="false" />
<NSConfig noRoot="false" />

<Http10Connector port="8080"
secure="false"
maxThreads="200"
maxSpareThreads="50"
minSpareThreads="10" />
<Ajp12Connector port="8007" />
<Ajp13Connector port="8009"
maxThreads="300"
maxSpareThreads="100"
minSpareThreads="10" />
.
.
.
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