Appendix D. Worker node configuration

stickySession

true

Specifies whether subsequent requests for a given session should be routed to the same node, if possible.

stickySessionRemove

false

Specifies whether the Apache HTTP Server proxy should remove session stickiness if the balancer is unable to route a request to the node to which it is stuck. This property is ignored if stickySession is false.

stickySessionForce

true

Specifies whether the Apache HTTP Server proxy should return an error if the balancer is unable to route a request to the node to which it is stuck. This property is ignored if stickySession is false.

workerTimeout

-1

Specifies the number of seconds to wait for a worker to become available to handle a request. When all the workers of a balancer are unusable, mod_cluster will retry after a while (workerTimeout/100) to find an usable worker. A value of -1 indicates that the Apache HTTP Server will not wait for a worker to be available and will return an error if no workers are available.

maxAttempts

1

Specifies the number of times the Apache HTTP Server proxy will attempt to send a given request to a worker before aborting. The minimum value is 1: try once before aborting.

flushPackets

false

Specifies whether packet flushing is enabled or disabled.

flushWait

-1

Specifies the time to wait before flushing packets. A value of -1 means wait forever.

ping

10

Time to wait (in seconds) for a pong answer to a ping.

smax

Specifies the soft maximum idle connection count. The maximum value is determined by the Apache HTTP Server thread configuration (ThreadsPerChild or 1).

ttl

60

Specifies the time (in seconds) idle connections persist, above the smax threshold.

nodeTimeout

-1

Specifies the time (in seconds) mod_cluster waits for the back-end server response before returning an error. mod_cluster always uses a cping/cpong before forwarding a request. The connectiontimeout value used by mod_cluster is the ping value.

balancer

mycluster

Specifies the name of the load-balancer.

loadBalancingGroup

Specifies the load balancing among jvmRoutes within the same load balancing group. A loadBalancingGroup is conceptually equivalent to a mod_jk domain directive.