Hello ,
I am getting OutOfMemoryError continuously when starting up two
cluster
nodes of tomcat5.5.17 (jdk1.5 on Advanced server 4). Any way it was
working
fine for 3 weeks time. This error occurs previously only one time
and when
restarted the tomcat, it worked.
Following is a part of catalina.out relevent to that error for
node 1.
============ ========================================================
INFO: Start ClusterSender at cluster
Catalina:type=Cluster,host=localhost
with name Catalina:type=ClusterSender,host=localhost
Jun 17, 2006 8:44:15 PM
org.apache.catalina.cluster.mcast.McastService start
INFO: Sleeping for 2000 milliseconds to establish cluster membership
Exception in thread "Cluster-MembershipReceiver"
java.lang.OutOfMemoryError:
Java heap space
Jun 17, 2006 8:44:17 PM
org.apache.catalina.cluster.mcast.McastService
registerMBean
INFO: membership mbean registered
(Catalina:type=ClusterMembership,host=localhost)
Jun 17, 2006 8:44:17 PM
org.apache.catalina.cluster.deploy.FarmWarDeployer
start
INFO: Cluster FarmWarDeployer started.
Jun 17, 2006 8:44:19 PM
org.apache.catalina.cluster.session.DeltaManager
start
INFO: Register manager /StockTradingServer to cluster element Host
with name
localhost Jun 17, 2006 8:44:19 PM
org.apache.catalina.cluster.session.DeltaManager
start
INFO: Starting clustering manager at /StockTradingServer Jun 17, 2006
8:44:19 PM org.apache.catalina.cluster.session.DeltaManager
getAllClusterSessions
INFO: Manager [/StockTradingServer]: skipping state transfer. No
members
active in cluster group.
=====================================================================
=
======
=====
node2 startup log is as follows
=====================================================================
=
======
=====
INFO: Cluster is about to start
Jun 17, 2006 8:53:00 PM
org.apache.catalina.cluster.tcp.ReplicationTransmitter start
INFO: Start ClusterSender at cluster
Catalina:type=Cluster,host=localhost
with name Catalina:type=ClusterSender,host=localhost
Jun 17, 2006 8:53:00 PM
org.apache.catalina.cluster.mcast.McastService start
INFO: Sleeping for 2000 milliseconds to establish cluster membership
Exception in thread "Cluster-MembershipReceiver"
java.lang.OutOfMemoryError:
Java heap space
Jun 17, 2006 8:53:02 PM
org.apache.catalina.cluster.mcast.McastService
registerMBean
INFO: membership mbean registered
(Catalina:type=ClusterMembership,host=localhost)
Jun 17, 2006 8:53:02 PM
org.apache.catalina.cluster.deploy.FarmWarDeployer
start
INFO: Cluster FarmWarDeployer started.
Jun 17, 2006 8:53:04 PM
org.apache.catalina.cluster.session.DeltaManager
start
INFO: Register manager /StockTradingServer to cluster element Host
with name
localhost Jun 17, 2006 8:53:04 PM
org.apache.catalina.cluster.session.DeltaManager
start
=====================================================================
=
======
=
Any way my clustor was working fine for 3 weeks time and started to
give
this error in startup of both the nodes.
I have an IBMHTTPServer with jk connector for load balancing and
that load
is comming my tomcat cluster.
following is the server.xml file for both the servers.
=====================================================================
=
======
=
<!-- Example Server Configuration File -->
<!-- Note that component elements are nested corresponding to their
parent-child relationships with each other -->
<!-- A "Server" is a singleton element that represents the entire
JVM,
which may contain one or more "Service" instances. The Server
listens for a shutdown command on the indicated port.
Note: A "Server" is not itself a "Container", so you may not
define subcomponents such as "Valves" or "Loggers" at this level.
-->
<Server port="8005" shutdown="SHUTDOWN">
<!-- Comment these entries out to disable JMX MBeans support used
for the
administration web application --> <Listener
className="org.apache.catalina.core.AprLifecycleListener" />
<Listener
className="org.apache.catalina.mbeans.ServerLifecycleListener" />
<Listener
className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListene
r
" />
<Listener
className="org.apache.catalina.storeconfig.StoreConfigLifecycleListen
e
r"/>
<!-- Global JNDI resources -->
<GlobalNamingResources>
<!-- Test entry for demonstration purposes -->
<Environment name="simpleValue" type="java.lang.Integer"
value="30"/>
<!-- Editable user database that can also be used by
UserDatabaseRealm to authenticate users -->
<Resource name="UserDatabase" auth="Container"
type="org.apache.catalina.UserDatabase"
description="User database that can be updated and saved"
factory="org.apache.catalina.users.MemoryUserDatabaseFactory"
pathname="conf/tomcat-users.xml" />
</GlobalNamingResources>
<!-- A "Service" is a collection of one or more "Connectors" that
share
a single "Container" (and therefore the web applications
visible
within that Container). Normally, that Container is an
"Engine",
but this is not required.
Note: A "Service" is not itself a "Container", so you may not
define subcomponents such as "Valves" or "Loggers" at this
level.
-->
<!-- Define the Tomcat Stand-Alone Service --> <Service
name="Catalina">
<!-- A "Connector" represents an endpoint by which requests are
received
and responses are returned. Each Connector passes requests
on to
the
associated "Container" (normally an Engine) for processing.
By default, a non-SSL HTTP/1.1 Connector is established on
port
8080.
You can also enable an SSL HTTP/1.1 Connector on port 8443 by
following the instructions below and uncommenting the second
Connector
entry. SSL support requires the following steps (see the
SSL Config
HOWTO in the Tomcat 5 documentation bundle for more detailed
instructions):
* If your JDK version 1.3 or prior, download and install
JSSE 1.0.2
or
later, and put the JAR files into "$JAVA_HOME/jre/lib/ext".
* Execute:
%JAVA_HOME%\bin\keytool -genkey -alias tomcat -keyalg RSA
(Windows)
$JAVA_HOME/bin/keytool -genkey -alias tomcat -keyalg
RSA (Unix)
with a password value of "changeit" for both the certificate and
the keystore itself.
By default, DNS lookups are enabled when a web application
calls
request.getRemoteHost(). This can have an adverse impact on
performance, so you can disable it by setting the
"enableLookups" attribute to "false". When DNS lookups are
disabled,
request.getRemoteHost() will return the String version of the
IP address of the remote client.
-->
<!-- Define a non-SSL HTTP/1.1 Connector on port 8080 -->
<Connector port="8088" maxHttpHeaderSize="8192"
maxThreads="300" minSpareThreads="25"
maxSpareThreads="75"
enableLookups="false" redirectPort="8443"
acceptCount="100"
connectionTimeout="20000"
disableUploadTimeout="true" />
<!-- Note : To disable connection timeouts, set
connectionTimeout value
to 0 -->
<!-- Note : To use gzip compression you could set the
following
properties :
compression="on"
compressionMinSize="2048"
noCompressionUserAgents="gozilla, traviata"
compressableMimeType="text/html,text/xml"
-->
<!-- Define a SSL HTTP/1.1 Connector on port 8443 -->
<!--
<Connector port="8443" maxHttpHeaderSize="8192"
maxThreads="150" minSpareThreads="25"
maxSpareThreads="75"
enableLookups="false" disableUploadTimeout="true"
acceptCount="100" scheme="https" secure="true"
clientAuth="false" sslProtocol="TLS" />
-->
<!-- Define an AJP 1.3 Connector on port 8009 -->
<Connector port="8009"
enableLookups="false" redirectPort="8443"
protocol="AJP/1.3"
/>
<!-- Define a Proxied HTTP/1.1 Connector on port 8082 -->
<!-- See proxy documentation for more information about using
this. -->
<!--
<Connector port="8082"
maxThreads="150" minSpareThreads="25"
maxSpareThreads="75"
enableLookups="false" acceptCount="100"
connectionTimeout="20000"
proxyPort="80" disableUploadTimeout="true" />
-->
<!-- An Engine represents the entry point (within Catalina) that
processes
every request. The Engine implementation for Tomcat stand
alone
analyzes the HTTP headers included with the request, and
passes them
on to the appropriate Host (virtual host). -->
<!-- You should set jvmRoute to support load-balancing via AJP
ie :
<Engine name="Standalone" defaultHost="localhost" jvmRoute="jvm1">
-->
<!-- Define the top level container in our container hierarchy -->
<Engine name="Catalina" defaultHost="localhost" jvmRoute="node01">
<!-- <Engine name="Catalina" jvmRoute="$JAVA_HOME" > -->
<!-- The request dumper valve dumps useful debugging
information about
the request headers and cookies that were received, and the
response
headers and cookies that were sent, for all requests
received by
this instance of Tomcat. If you care only about requests
to a
particular virtual host, or a particular application,
nest this
element inside the corresponding <Host> or <Context> entry
instead.
For a similar mechanism that is portable to all Servlet 2.4
containers, check out the "RequestDumperFilter" Filter in
the
example application (the source for this filter may be
found in
"$CATALINA_HOME/webapps/examples/WEB-INF/classes/filters").
Request dumping is disabled by default. Uncomment the
following
element to enable it. -->
<!--
<Valve
className="org.apache.catalina.valves.RequestDumperValve"/>
-->
<!-- Because this Realm is here, an instance will be shared
globally
-->
<!-- This Realm uses the UserDatabase configured in the global
JNDI
resources under the key "UserDatabase". Any edits
that are performed against this UserDatabase are
immediately
available for use by the Realm. -->
<Realm className="org.apache.catalina.realm.UserDatabaseRealm"
resourceName="UserDatabase"/>
<!-- Comment out the old realm but leave here for now in case we
need to go back quickly -->
<!--
<Realm className="org.apache.catalina.realm.MemoryRealm" />
-->
<!-- Replace the above Realm with one of the following to get
a Realm
stored in a database and accessed via JDBC -->
<Realm className="org.apache.catalina.realm.JDBCRealm"
driverName="org.gjt.mm.mysql.Driver"
connectionURL="jdbc:mysql://172.16.1.55:3306/kutila"
connectionName="kutila" connectionPassword="kutila"
userTable="users" userNameCol="user_name"
userCredCol="user_pass"
userRoleTable="user_roles" roleNameCol="role_name" />
<!--
<Realm className="org.apache.catalina.realm.JDBCRealm"
driverName="oracle.jdbc.driver.OracleDriver"
connectionURL="jdbc:oracle:thin:@ntserver:1521:ORCL"
connectionName="scott" connectionPassword="tiger"
userTable="users" userNameCol="user_name"
userCredCol="user_pass"
userRoleTable="user_roles" roleNameCol="role_name" />
-->
<!--
<Realm className="org.apache.catalina.realm.JDBCRealm"
driverName="sun.jdbc.odbc.JdbcOdbcDriver"
connectionURL="jdbc:odbc:CATALINA"
userTable="users" userNameCol="user_name"
userCredCol="user_pass"
userRoleTable="user_roles" roleNameCol="role_name" />
-->
<!-- Define the default virtual host
Note: XML Schema validation will not work with Xerces 2.2.
-->
<Host name="localhost" appBase="webapps"
unpackWARs="true" autoDeploy="true"
xmlValidation="false" xmlNamespaceAware="false">
<!-- Defines a cluster for this node,
By defining this element, means that every manager
will be
changed.
So when running a cluster, only make sure that you have
webapps
in there
that need to be clustered and remove the other ones.
A cluster has the following parameters:
className = the fully qualified name of the cluster class
clusterName = a descriptive name for your cluster, can be
anything
mcastAddr = the multicast address, has to be the same
for all
the nodes
mcastPort = the multicast port, has to be the same for
all the
nodes
mcastBindAddress = bind the multicast socket to a
specific
address
mcastTTL = the multicast TTL if you want to limit your
broadcast
mcastSoTimeout = the multicast readtimeout
mcastFrequency = the number of milliseconds in between
sending a
"I'm alive" heartbeat
mcastDropTime = the number a milliseconds before a
node is
considered "dead" if no heartbeat is received
tcpThreadCount = the number of threads to handle incoming
replication requests, optimal would be the same amount of threads
as nodes
tcpListenAddress = the listen address (bind address)
for TCP
cluster request on this host,
in case of multiple ethernet cards.
auto means that address becomes
InetAddress.getLocalHost
().getHostAddress()
tcpListenPort = the tcp listen port
tcpSelectorTimeout = the timeout (ms) for the
Selector.select()
method in case the OS
has a wakup bug in java.nio. Set
to 0 for
no timeout
printToScreen = true means that managers will also
print to
std.out
expireSessionsOnShutdown = true means that
useDirtyFlag = true means that we only replicate a
session after
setAttribute,removeAttribute has been called.
false means to replicate the session
after each
request.
false means that replication would work
for the
following piece of code: (only for SimpleTcpReplicationManager)
<%
HashMap map =
(HashMap)session.getAttribute("map");
map.put("key","value");
%>
replicationMode = can be either 'pooled',
'synchronous' or
'asynchronous'.
* Pooled means that the replication
happens
using several sockets in a synchronous way. Ie, the data gets
replicated,
then the request return. This is the same as the 'synchronous'
setting
except it uses a pool of sockets, hence it is multithreaded. This
is the
fastest and safest configuration. To use this, also increase the nr
of tcp
threads that you have dealing with replication.
* Synchronous means that the thread
that
executes the request, is also the
thread the replicates the data to the
other
nodes, and will not return until all
nodes have received the information.
* Asynchronous means that there is a
specific
'sender' thread for each cluster node,
so the request thread will queue the
replication request into a "smart" queue,
and then return to the client.
The "smart" queue is a queue where
when a
session is added to the queue, and the same session
already exists in the queue from a
previous
request, that session will be replaced
in the queue instead of replicating two
requests. This almost never happens, unless there is a
large network delay.
-->
<!--
When configuring for clustering, you also add in a valve
to catch
all the requests
coming in, at the end of the request, the session may or
may not
be replicated.
A session is replicated if and only if all the
conditions are
met:
1. useDirtyFlag is true or setAttribute or
removeAttribute has
been called AND
2. a session exists (has been created)
3. the request is not trapped by the "filter" attribute
The filter attribute is to filter out requests that
could not
modify the session,
hence we don't replicate the session after the end of this
request.
The filter is negative, ie, anything you put in the
filter, you
mean to filter out,
ie, no replication will be done on requests that match
one of the
filters.
The filter attribute is delimited by ;, so you can't
escape out ;
even if you wanted to.
filter=".*\.gif;.*\.js;" means that we will not
replicate the
session after requests with the URI
ending with .gif and .js are intercepted.
The deployer element can be used to deploy apps cluster
wide.
Currently the deployment only deploys/undeploys to working
members in the cluster
so no WARs are copied upons startup of a broken node.
The deployer watches a directory (watchDir) for WAR
files when
watchEnabled="true"
When a new war file is added the war gets deployed to
the local
instance,
and then deployed to the other instances in the cluster.
When a war file is deleted from the watchDir the war is
undeployed locally
and cluster wide
-->
<Cluster
className="org.apache.catalina.cluster.tcp.SimpleTcpCluster"
managerClassName="org.apache.catalina.cluster.session.DeltaManager"
expireSessionsOnShutdown="true"
useDirtyFlag="true"
notifyListenersOnReplication="true">
<Membership
className="org.apache.catalina.cluster.mcast.McastService"
mcastAddr="228.0.0.4"
mcastPort="45564"
mcastFrequency="500"
mcastDropTime="3000"/>
<Receiver
className="org.apache.catalina.cluster.tcp.ReplicationListener"
tcpListenAddress="auto"
tcpListenPort="4001"
tcpSelectorTimeout="100"
tcpThreadCount="2"/>
<Sender
className="org.apache.catalina.cluster.tcp.ReplicationTransmitter"
replicationMode="pooled"
ackTimeout="15000"
waitForAck="true"/>
<Valve
className="org.apache.catalina.cluster.tcp.ReplicationValve"
filter=".*\.gif;.*\.js;.*\.jpg;.*\.png;.*\.htm;.*\.html;.*\.css;.*
\.txt;"/>
<Deployer
className="org.apache.catalina.cluster.deploy.FarmWarDeployer"
tempDir="/tmp/war-temp/"
deployDir="/tmp/war-deploy/"
watchDir="/tmp/war-listen/"
watchEnabled="false"/>
<ClusterListener
className="org.apache.catalina.cluster.session.ClusterSessionListener
"
/>
</Cluster>
<!-- Normally, users must authenticate themselves to each
web app
individually. Uncomment the following entry if you
would like
a user to be authenticated the first time they
encounter a
resource protected by a security constraint, and then
have that
user identity maintained across *all* web applications
contained
in this virtual host. -->
<!--
<Valve
className="org.apache.catalina.authenticator.SingleSignOn" />
-->
<!-- Access log processes all requests for this virtual
host. By
default, log files are created in the "logs" directory
relative
to
$CATALINA_HOME. If you wish, you can specify a different
directory with the "directory" attribute. Specify
either a
relative
(to $CATALINA_HOME) or absolute path to the desired
directory.
-->
<!--
<Valve className="org.apache.catalina.valves.AccessLogValve"
directory="logs" prefix="localhost_access_log."
suffix=".txt"
pattern="common" resolveHosts="false"/>
-->
<!-- Access log processes all requests for this virtual
host. By
default, log files are created in the "logs" directory
relative
to
$CATALINA_HOME. If you wish, you can specify a different
directory with the "directory" attribute. Specify
either a
relative
(to $CATALINA_HOME) or absolute path to the desired
directory.
This access log implementation is optimized for maximum
performance,
but is hardcoded to support only the "common" and
"combined"
patterns.
-->
<!--
<Valve
className="org.apache.catalina.valves.FastCommonAccessLogValve"
directory="logs" prefix="localhost_access_log."
suffix=".txt"
pattern="common" resolveHosts="false"/>
-->
</Host>
</Engine>
</Service>
</Server>
===========================================================
I appriceate your prompt help on this since this is a very critical
application live for the moment. Always send me an email for any
clarifications.
Thanks and best regards,
Dilan
