Hey Randy,
tcpThreadCount is the number of parallel NIO receiver threads. Every
tomcat cluster node with pooled mode has
25 sender threads (Default). Normally two receiver thread per backup
node are calc. More recevier worker means that
you produce more load for replication at backup!
At heavy loaded site I use only the fastasyncqueue mode. This mode has
at my test case
better performance and more guaranty that replication works well. You
can also switch to the domain cluster model.
Install more nodes with different backup domainnodes.
Example
Apache 1 and four tomcats
T01 and T03 are inside domain A ( same mcast port)
T02 and T04 are inside domain B ( same mcast port)
T01 and T02 living at box B1
T03 and T04 living at box B2
Peter
PS: When you used tomcat 5.5.9 don't forget to install the cluster fix
pack ( s. bugzilla)
Randy Paries schrieb:
Hello,
How do I determine what value I should set tcpThreadCount to
Currently I have the setting below and a very busy app server.
Thanks
Randy
<Receiver className="org.apache.catalina.cluster.tcp.ReplicationListener"
tcpListenAddress="10.0.0.88"
tcpListenPort="4001"
tcpSelectorTimeout="100"
tcpThreadCount="6" />
<Sender className="org.apache.catalina.cluster.tcp.ReplicationTransmitter"
replicationMode="pooled"
autoConnect="true"
waitForAck="true"
sendAllSessions="false"
sendAllSessionsSize="100"
compress="true"
ackTimeout="15000"/>
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