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Full Discussion: Restart TomEE frequently because URL is not responding
Top Forums Web Development Restart TomEE frequently because URL is not responding Post 303031362 by hicksd8 on Wednesday 27th of February 2019 04:32:05 AM
Old 02-27-2019
Be warned that bumping posts are against the rules on this forum and moderators might sanction you for it.

Which load balancer (LB) are you using??

However, I would be likely to compare the 4 configurations (conf/server.xml) to explore any differences seen. TomEE still uses normal Tomcat Clustering and that needs checking out.

I would be inclined to guess that the LB is not overloading node1, on the contrary, the LB is continuing to send requests to node1 after that node has failed (for some reason). There is a fault (hardware, software or configuration) with node1.

The two minute delay you see to load the page is, in fact, the timeout before the request is successfully delivered to a surviving node. If everything is configured properly, it shouldn't take this long. Furthermore, once the failed node is kicked out of the cluster (until you issue the command for it to rejoin), the LB should know that node1 is dead and no longer send requests to it. You then run on three nodes after failover and all is fine and dandy.

So your problem is that failover is not occurring in an orderly fashion. I would confirm whether node1 is actually joining the cluster at all or you have a cluster of three plus a stand-alone node.

The way it should work is that the four cluster members should know immediately if one of them fails. The failed node gets kicked out. The surviving nodes relay this state to the LB which no longer sends requests to the failed node.

Which LB are you using??

Ref:
Apache TomEE
How to Setup Load Balancing in Tomcat/TomEE with mod_proxy_balancer - Simples Assim
Tomcat Clustering - A Step By Step Guide | MuleSoft
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LEARN ABOUT HPUX

cmhaltnode

cmhaltnode(1m)															    cmhaltnode(1m)

NAME

       cmhaltnode - halt a node in a high availability cluster

SYNOPSIS

       cmhaltnode [-f] [-v] [-t] [node_name...]

DESCRIPTION

       cmhaltnode causes a node to halt its cluster daemon and remove itself from the existing cluster.

       To halt cluster on the node, a user must either be superuser(UID=0), or have an access policy of FULL_ADMIN allowed in the cluster configu-
       ration file. See access policy in cmquerycl.

       When cmhaltnode is run on a node, the cluster daemon is halted and, optionally, all packages that were running on that node  are  moved	to
       other nodes if possible.

       If node_name is not specified, the cluster daemon running on the local node will be halted and removed from the existing cluster.

       If  you issue this command while a cluster is still in the process of forming, the command will fail with the message "Unable to connect to
       daemon."  If this happens, wait for the cluster to form successfully, then issue the command again.

   Options
       cmhaltnode supports the following options:

	      -f	Force the node to halt even if there are packages or group members running on it.  The group members on the node  will	be
			terminated.   The halt scripts for all packages running on the node will be run; based on priority or dependency relation-
			ships, this may affect packages on other nodes. In other words, packages on other nodes may either start or halt based	on
			this  package halting.	If the package configuration and current cluster membership permit, and if the package halt script
			succeeds, the packages will be started on other nodes.	Without this option, if packages are running on  the  given  node,
			the command will fail.	If a package fails to halt, the node halt will also fail.

	      -v	Verbose output will be displayed.

	      -t	Test  only.  Provide  an assessment of the package placement without affecting the current state of the nodes or packages.
			This option validates the node's eligibility with respect to the package dependencies as well as the external dependencies
			such as EMS resources, package subnets, and storage before predicting any package placement decisions. If there is a pack-
			age in maintenance mode running on the nodes being halted, the package will always be halted and not failover  to  another
			node; the report will not display an assessment for that package.

	      node_name...
			The name of the node(s) to halt.

RETURN VALUE

       cmhaltnode returns the following value:

	       0   Successful completion.
	       1   Command failed.

EXAMPLES

       Halt the cluster daemon on two other nodes:

	      cmhaltnode node2 node3

AUTHOR

       cmhaltnode was developed by HP.

SEE ALSO

       cmquerycl(1m), cmhaltcl(1m), cmruncl(1m), cmrunnode(1m), cmviewcl(1m), cmeval(1m).

						      Requires Optional Serviceguard Software					    cmhaltnode(1m)
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